Provided by: nmap_7.01-2ubuntu2_amd64 bug

NAME

       nping - Network packet generation tool / ping utility

SYNOPSIS

       nping [Options] {targets}

DESCRIPTION

       Nping is an open-source tool for network packet generation, response analysis and response
       time measurement. Nping allows users to generate network packets of a wide range of
       protocols, letting them tune virtually any field of the protocol headers. While Nping can
       be used as a simple ping utility to detect active hosts, it can also be used as a raw
       packet generator for network stack stress tests, ARP poisoning, Denial of Service attacks,
       route tracing, and other purposes.

       Additionally, Nping offers a special mode of operation called the "Echo Mode", that lets
       users see how the generated probes change in transit, revealing the differences between
       the transmitted packets and the packets received at the other end. See section "Echo Mode"
       for details.

       The output from Nping is a list of the packets that are being sent and received. The level
       of detail depends on the options used.

       A typical Nping execution is shown in Example 1. The only Nping arguments used in this
       example are -c, to specify the number of times to target each host, --tcp to specify TCP
       Probe Mode, -p 80,433 to specify the target ports; and then the two target hostnames.

       Example 1. A representative Nping execution

           # nping -c 1 --tcp -p 80,433 scanme.nmap.org google.com

           Starting Nping ( https://nmap.org/nping )
           SENT (0.0120s) TCP 96.16.226.135:50091 > 64.13.134.52:80 S ttl=64 id=52072 iplen=40  seq=1077657388 win=1480
           RCVD (0.1810s) TCP 64.13.134.52:80 > 96.16.226.135:50091 SA ttl=53 id=0 iplen=44  seq=4158134847 win=5840 <mss 1460>
           SENT (1.0140s) TCP 96.16.226.135:50091 > 74.125.45.100:80 S ttl=64 id=13932 iplen=40  seq=1077657388 win=1480
           RCVD (1.1370s) TCP 74.125.45.100:80 > 96.16.226.135:50091 SA ttl=52 id=52913 iplen=44  seq=2650443864 win=5720 <mss 1430>
           SENT (2.0140s) TCP 96.16.226.135:50091 > 64.13.134.52:433 S ttl=64 id=8373 iplen=40  seq=1077657388 win=1480
           SENT (3.0140s) TCP 96.16.226.135:50091 > 74.125.45.100:433 S ttl=64 id=23624 iplen=40  seq=1077657388 win=1480

           Statistics for host scanme.nmap.org (64.13.134.52):
            |  Probes Sent: 2 | Rcvd: 1 | Lost: 1  (50.00%)
            |_ Max rtt: 169.720ms | Min rtt: 169.720ms | Avg rtt: 169.720ms
           Statistics for host google.com (74.125.45.100):
            |  Probes Sent: 2 | Rcvd: 1 | Lost: 1  (50.00%)
            |_ Max rtt: 122.686ms | Min rtt: 122.686ms | Avg rtt: 122.686ms
           Raw packets sent: 4 (160B) | Rcvd: 2 (92B) | Lost: 2 (50.00%)
           Tx time: 3.00296s | Tx bytes/s: 53.28 | Tx pkts/s: 1.33
           Rx time: 3.00296s | Rx bytes/s: 30.64 | Rx pkts/s: 0.67
           Nping done: 2 IP addresses pinged in 4.01 seconds

OPTIONS SUMMARY

       This options summary is printed when Nping is run with no arguments. It helps people
       remember the most common options, but is no substitute for the in-depth documentation in
       the rest of this manual. Some obscure options aren't even included here.

           Nping 0.5.59BETA1 ( https://nmap.org/nping )
           Usage: nping [Probe mode] [Options] {target specification}

           TARGET SPECIFICATION:
             Targets may be specified as hostnames, IP addresses, networks, etc.
             Ex: scanme.nmap.org, microsoft.com/24, 192.168.0.1; 10.0.0-255.1-254
           PROBE MODES:
             --tcp-connect                    : Unprivileged TCP connect probe mode.
             --tcp                            : TCP probe mode.
             --udp                            : UDP probe mode.
             --icmp                           : ICMP probe mode.
             --arp                            : ARP/RARP probe mode.
             --tr, --traceroute               : Traceroute mode (can only be used with
                                                TCP/UDP/ICMP modes).
           TCP CONNECT MODE:
              -p, --dest-port <port spec>     : Set destination port(s).
              -g, --source-port <portnumber>  : Try to use a custom source port.
           TCP PROBE MODE:
              -g, --source-port <portnumber>  : Set source port.
              -p, --dest-port <port spec>     : Set destination port(s).
              --seq <seqnumber>               : Set sequence number.
              --flags <flag list>             : Set TCP flags (ACK,PSH,RST,SYN,FIN...)
              --ack <acknumber>               : Set ACK number.
              --win <size>                    : Set window size.
              --badsum                        : Use a random invalid checksum.
           UDP PROBE MODE:
              -g, --source-port <portnumber>  : Set source port.
              -p, --dest-port <port spec>     : Set destination port(s).
              --badsum                        : Use a random invalid checksum.
           ICMP PROBE MODE:
             --icmp-type <type>               : ICMP type.
             --icmp-code <code>               : ICMP code.
             --icmp-id <id>                   : Set identifier.
             --icmp-seq <n>                   : Set sequence number.
             --icmp-redirect-addr <addr>      : Set redirect address.
             --icmp-param-pointer <pnt>       : Set parameter problem pointer.
             --icmp-advert-lifetime <time>    : Set router advertisement lifetime.
             --icmp-advert-entry <IP,pref>    : Add router advertisement entry.
             --icmp-orig-time  <timestamp>    : Set originate timestamp.
             --icmp-recv-time  <timestamp>    : Set receive timestamp.
             --icmp-trans-time <timestamp>    : Set transmit timestamp.
           ARP/RARP PROBE MODE:
             --arp-type <type>                : Type: ARP, ARP-reply, RARP, RARP-reply.
             --arp-sender-mac <mac>           : Set sender MAC address.
             --arp-sender-ip  <addr>          : Set sender IP address.
             --arp-target-mac <mac>           : Set target MAC address.
             --arp-target-ip  <addr>          : Set target IP address.
           IPv4 OPTIONS:
             -S, --source-ip                  : Set source IP address.
             --dest-ip <addr>                 : Set destination IP address (used as an
                                                alternative to {target specification} ).
             --tos <tos>                      : Set type of service field (8bits).
             --id  <id>                       : Set identification field (16 bits).
             --df                             : Set Don't Fragment flag.
             --mf                             : Set More Fragments flag.
             --ttl <hops>                     : Set time to live [0-255].
             --badsum-ip                      : Use a random invalid checksum.
             --ip-options <S|R [route]|L [route]|T|U ...> : Set IP options
             --ip-options <hex string>                    : Set IP options
             --mtu <size>                     : Set MTU. Packets get fragmented if MTU is
                                                small enough.
           IPv6 OPTIONS:
             -6, --IPv6                       : Use IP version 6.
             --dest-ip                        : Set destination IP address (used as an
                                                alternative to {target specification}).
             --hop-limit                      : Set hop limit (same as IPv4 TTL).
             --traffic-class <class> :        : Set traffic class.
             --flow <label>                   : Set flow label.
           ETHERNET OPTIONS:
             --dest-mac <mac>                 : Set destination mac address. (Disables
                                                ARP resolution)
             --source-mac <mac>               : Set source MAC address.
             --ether-type <type>              : Set EtherType value.
           PAYLOAD OPTIONS:
             --data <hex string>              : Include a custom payload.
             --data-string <text>             : Include a custom ASCII text.
             --data-length <len>              : Include len random bytes as payload.
           ECHO CLIENT/SERVER:
             --echo-client <passphrase>       : Run Nping in client mode.
             --echo-server <passphrase>       : Run Nping in server mode.
             --echo-port <port>               : Use custom <port> to listen or connect.
             --no-crypto                      : Disable encryption and authentication.
             --once                           : Stop the server after one connection.
             --safe-payloads                  : Erase application data in echoed packets.
           TIMING AND PERFORMANCE:
             Options which take <time> are in seconds, or append 'ms' (milliseconds),
             's' (seconds), 'm' (minutes), or 'h' (hours) to the value (e.g. 30m, 0.25h).
             --delay <time>                   : Adjust delay between probes.
             --rate  <rate>                   : Send num packets per second.
           MISC:
             -h, --help                       : Display help information.
             -V, --version                    : Display current version number.
             -c, --count <n>                  : Stop after <n> rounds.
             -e, --interface <name>           : Use supplied network interface.
             -H, --hide-sent                  : Do not display sent packets.
             -N, --no-capture                 : Do not try to capture replies.
             --privileged                     : Assume user is fully privileged.
             --unprivileged                   : Assume user lacks raw socket privileges.
             --send-eth                       : Send packets at the raw ethernet layer.
             --send-ip                        : Send packets using raw IP sockets.
             --bpf-filter <filter spec>       : Specify custom BPF filter.
           OUTPUT:
             -v                               : Increment verbosity level by one.
             -v[level]                        : Set verbosity level. E.g: -v4
             -d                               : Increment debugging level by one.
             -d[level]                        : Set debugging level. E.g: -d3
             -q                               : Decrease verbosity level by one.
             -q[N]                            : Decrease verbosity level N times
             --quiet                          : Set verbosity and debug level to minimum.
             --debug                          : Set verbosity and debug to the max level.
           EXAMPLES:
             nping scanme.nmap.org
             nping --tcp -p 80 --flags rst --ttl 2 192.168.1.1
             nping --icmp --icmp-type time --delay 500ms 192.168.254.254
             nping --echo-server "public" -e wlan0 -vvv
             nping --echo-client "public" echo.nmap.org --tcp -p1-1024 --flags ack

           SEE THE MAN PAGE FOR MANY MORE OPTIONS, DESCRIPTIONS, AND EXAMPLES

TARGET SPECIFICATION

       Everything on the Nping command line that isn't an option or an option argument is treated
       as a target host specification. Nping uses the same syntax for target specifications that
       Nmap does. The simplest case is a single target given by IP address or hostname.

       Nping supports CIDR-style.  addressing. You can append /numbits to an IPv4 address or
       hostname and Nping will send probes to every IP address for which the first numbits are
       the same as for the reference IP or hostname given. For example, 192.168.10.0/24 would
       send probes to the 256 hosts between 192.168.10.0 (binary: 11000000 10101000 00001010
       00000000) and 192.168.10.255 (binary: 11000000 10101000 00001010 11111111), inclusive.
       192.168.10.40/24 would ping exactly the same targets. Given that the host scanme.nmap.org.
       is at the IP address 64.13.134.52, the specification scanme.nmap.org/16 would send probes
       to the 65,536 IP addresses between 64.13.0.0 and 64.13.255.255. The smallest allowed value
       is /0, which targets the whole Internet. The largest value is /32, which targets just the
       named host or IP address because all address bits are fixed.

       CIDR notation is short but not always flexible enough. For example, you might want to send
       probes to 192.168.0.0/16 but skip any IPs ending with .0 or .255 because they may be used
       as subnet network and broadcast addresses. Nping supports this through octet range
       addressing. Rather than specify a normal IP address, you can specify a comma-separated
       list of numbers or ranges for each octet. For example, 192.168.0-255.1-254 will skip all
       addresses in the range that end in .0 or .255, and 192.168.3-5,7.1 will target the four
       addresses 192.168.3.1, 192.168.4.1, 192.168.5.1, and 192.168.7.1. Either side of a range
       may be omitted; the default values are 0 on the left and 255 on the right. Using - by
       itself is the same as 0-255, but remember to use 0- in the first octet so the target
       specification doesn't look like a command-line option. Ranges need not be limited to the
       final octets: the specifier 0-.-.13.37 will send probes to all IP addresses on the
       Internet ending in .13.37. This sort of broad sampling can be useful for Internet surveys
       and research.

       IPv6 addresses can only be specified by their fully qualified IPv6 address or hostname.
       CIDR and octet ranges aren't supported for IPv6 because they are rarely useful.

       Nping accepts multiple host specifications on the command line, and they don't need to be
       the same type. The command nping scanme.nmap.org 192.168.0.0/8 10.0.0,1,3-7.- does what
       you would expect.

OPTION SPECIFICATION

       Nping is designed to be very flexible and fit a wide variety of needs. As with most
       command-line tools, its behavior can be adjusted using command-line options. These general
       principles apply to option arguments, unless stated otherwise.

       Options that take integer numbers can accept values specified in decimal, octal or
       hexadecimal base. When a number starts with 0x, it will be treated as hexadecimal; when it
       simply starts with 0, it will be treated as octal. Otherwise, Nping will assume the number
       has been specified in base 10. Virtually all numbers that can be supplied from the command
       line are unsigned so, as a general rule, the minimum value is zero. Users may also specify
       the word random or rand to make Nping generate a random value within the expected range.

       IP addresses may be given as IPv4 addresses (e.g.  192.168.1.1), IPv6 addresses (e.g.
       2001:db8:85a3::8e4c:760:7146), or hostnames, which will be resolved using the default DNS
       server configured in the host system.

       Options that take MAC addresses accept the usual colon-separated 6 hex byte format (e.g.
       00:50:56:d4:01:98). Hyphens may also be used instead of colons (e.g.  00-50-56-c0-00-08).
       The special word random or rand sets a random address and the word broadcast or bcast sets
       ff:ff:ff:ff:ff:ff.

GENERAL OPERATION

       Unlike other ping and packet generation tools, Nping supports multiple target host and
       port specifications. While this provides great flexibility, it is not obvious how Nping
       handles situations where there is more than one host and/or more than one port to send
       probes to. This section explains how Nping behaves in these cases.

       When multiple target hosts are specified, Nping rotates among them in round-robin fashion.
       This gives slow hosts more time to send their responses before another probe is sent to
       them. Ports are also scheduled using round robin. So, unless only one port is specified,
       Nping never sends two probes to the same target host and port consecutively.

       The loop around targets is the “inner loop” and the loop around ports is the “outer loop”.
       All targets will be sent a probe for a given port before moving on to the next port.
       Between probes, Nping waits a configurable amount of time called the “inter-probe delay”,
       which is controlled by the --delay option. These examples show how it works.

               # nping --tcp -c 2 1.1.1.1 -p 100-102

               Starting Nping ( https://nmap.org/nping )
               SENT (0.0210s) TCP 192.168.1.77 > 1.1.1.1:100
               SENT (1.0230s) TCP 192.168.1.77 > 1.1.1.1:101
               SENT (2.0250s) TCP 192.168.1.77 > 1.1.1.1:102
               SENT (3.0280s) TCP 192.168.1.77 > 1.1.1.1:100
               SENT (4.0300s) TCP 192.168.1.77 > 1.1.1.1:101
               SENT (5.0320s) TCP 192.168.1.77 > 1.1.1.1:102

               # nping --tcp -c 2 1.1.1.1 2.2.2.2 3.3.3.3 -p 8080

               Starting Nping ( https://nmap.org/nping )
               SENT (0.0230s) TCP 192.168.0.21 > 1.1.1.1:8080
               SENT (1.0240s) TCP 192.168.0.21 > 2.2.2.2:8080
               SENT (2.0260s) TCP 192.168.0.21 > 3.3.3.3:8080
               SENT (3.0270s) TCP 192.168.0.21 > 1.1.1.1:8080
               SENT (4.0290s) TCP 192.168.0.21 > 2.2.2.2:8080
               SENT (5.0310s) TCP 192.168.0.21 > 3.3.3.3:8080

               # nping --tcp -c 1 --delay 500ms 1.1.1.1 2.2.2.2 3.3.3.3 -p 137-139

               Starting Nping ( https://nmap.org/nping )
               SENT (0.0230s) TCP 192.168.0.21 > 1.1.1.1:137
               SENT (0.5250s) TCP 192.168.0.21 > 2.2.2.2:137
               SENT (1.0250s) TCP 192.168.0.21 > 3.3.3.3:137
               SENT (1.5280s) TCP 192.168.0.21 > 1.1.1.1:138
               SENT (2.0280s) TCP 192.168.0.21 > 2.2.2.2:138
               SENT (2.5310s) TCP 192.168.0.21 > 3.3.3.3:138
               SENT (3.0300s) TCP 192.168.0.21 > 1.1.1.1:139
               SENT (3.5330s) TCP 192.168.0.21 > 2.2.2.2:139
               SENT (4.0330s) TCP 192.168.0.21 > 3.3.3.3:139

PROBE MODES

       Nping supports a wide variety of protocols. Although in some cases Nping can automatically
       determine the mode from the options used, it is generally a good idea to specify it
       explicitly.

       --tcp-connect (TCP Connect mode) .
           TCP connect mode is the default mode when a user does not have raw packet privileges.
           Instead of writing raw packets as most other modes do, Nping asks the underlying
           operating system to establish a connection with the target machine and port by issuing
           the connect system call. This is the same high-level system call that web browsers,
           P2P clients, and most other network-enabled applications use to establish a
           connection. It is part of a programming interface known as the Berkeley Sockets API.
           Rather than read raw packet responses off the wire, Nping uses this API to obtain
           status information on each connection attempt. For this reason, you will not be able
           to see the contents of the packets that are sent or received but only status
           information about the TCP connection establishment taking place.

       --tcp (TCP mode) .
           TCP is the mode that lets users create and send any kind of TCP packet. TCP packets
           are sent embedded in IP packets that can also be tuned. This mode can be used for many
           different purposes. For example you could try to discover open ports by sending TCP
           SYN messages without completing the three-way handshake. This technique is often
           referred to as half-open scanning, because you don't open a full TCP connection. You
           send a SYN packet, as if you are going to open a real connection and then wait for a
           response. A SYN/ACK indicates the port is open, while a RST indicates it's closed. If
           no response is received one could assume that some intermediate network device is
           filtering the responses. Another use could be to see how a remote TCP/IP stack behaves
           when it receives a non-RFC-compliant packet, like one with both SYN and RST flags set.
           One could also do some evil by creating custom RST packets using an spoofed IP address
           with the intent of closing an active TCP connection.

       --udp (UDP mode) .
           UDP mode can have two different behaviours. Under normal circumstances, it lets users
           create custom IP/UDP packets. However, if Nping is run by a user without raw packet
           privileges and no changes to the default protocol headers are requested, then Nping
           enters the unprivileged UDP mode which basically sends UDP packets to the specified
           target hosts and ports using the sendto system call. Note that in this unprivileged
           mode it is not possible to see low-level header information of the packets on the wire
           but only status information about the amount of bytes that are being transmitted and
           received. UDP mode can be used to interact with any UDP-based server. Examples are DNS
           servers, streaming servers, online gaming servers, and port knocking/single-packet.
           authorization daemons.

       --icmp (ICMP mode) .
           ICMP mode is the default mode when the user runs Nping with raw packet privileges. Any
           kind of ICMP message can be created. The default ICMP type is Echo, i.e., ping. ICMP
           mode can be used for many different purposes, from a simple request for a timestamp or
           a netmask to the transmission of fake destination unreachable messages, custom
           redirects, and router advertisements.

       --arp (ARP/RARP mode) .
           ARP lets you create and send a few different ARP-related packets. These include ARP,
           RARP, DRARP, and InARP requests and replies. This mode can ban be used to perform
           low-level host discovery, and conduct ARP-cache poisoning attacks.

       --traceroute (Traceroute mode) .
           Traceroute is not a mode by itself but a complement to TCP, UDP, and ICMP modes. When
           this option is specified Nping will set the IP TTL value of the first probe to 1. When
           the next router receives the packet it will drop it due to the expiration of the TTL
           and it will generate an ICMP destination unreachable message. The next probe will have
           a TTL of 2 so now the first router will forward the packet while the second router
           will be the one that drops the packet and generates the ICMP message. The third probe
           will have a TTL value of 3 and so on. By examining the source addresses of all those
           ICMP Destination Unreachable messages it is possible to determine the path that the
           probes take until they reach their final destination.

TCP CONNECT MODE

       -p port_spec, --dest-port port_spec (Target ports) .
           This option specifies which ports you want to try to connect to. It can be a single
           port, a comma-separated list of ports (e.g.  80,443,8080), a range (e.g.  1-1023), and
           any combination of those (e.g.  21-25,80,443,1024-2048). The beginning and/or end
           values of a range may be omitted, causing Nping to use 1 and 65535, respectively. So
           you can specify -p- to target ports from 1 through 65535. Using port zero is allowed
           if you specify it explicitly.

       -g portnumber, --source-port portnumber (Spoof source port) .
           This option asks Nping to use the specified port as source port for the TCP
           connections. Note that this might not work on all systems or may require root
           privileges. Specified value must be an integer in the range [0–65535].

TCP MODE

       -p port_spec, --dest-port port_spec (Target ports)
           This option specifies which destination ports you want to send probes to. It can be a
           single port, a comma-separated list of ports (e.g.  80,443,8080), a range (e.g.
           1-1023), and any combination of those (e.g.  21-25,80,443,1024-2048). The beginning
           and/or end values of a range may be omitted, causing Nping to use 1 and 65535,
           respectively. So you can specify -p- to target ports from 1 through 65535. Using port
           zero is allowed if you specify it explicitly.

       -g portnumber, --source-port portnumber (Spoof source port)
           This option asks Nping to use the specified port as source port for the TCP
           connections. Note that this might not work on all systems or may require root
           privileges. Specified value must be an integer in the range [0–65535].

       --seq seqnumber (Sequence Number) .
           Specifies the TCP sequence number. In SYN packets this is the initial sequence number
           (ISN). In a normal transmission this corresponds to the sequence number of the first
           byte of data in the segment.  seqnumber must be a number in the range [0–4294967295].

       --flags flags (TCP Flags) .
           This option specifies which flags should be set in the TCP packet.  flags may be
           specified in three different ways:

            1. As a comma-separated list of flags, e.g.  --flags syn,ack,rst

            2. As a list of one-character flag initials, e.g.  --flags SAR tells Nping to set
               flags SYN, ACK, and RST.

            3. As an 8-bit hexadecimal number, where the supplied number is the exact value that
               will be placed in the flags field of the TCP header. The number should start with
               the prefix 0x and should be in the range [0x00–0xFF], e.g.  --flags 0x20 sets the
               URG flag as 0x20 corresponds to binary 00100000 and the URG flag is represented by
               the third bit.

           There are 8 possible flags to set: CWR, ECN, URG, ACK, PSH, RST, SYN, and FIN. The
           special value ALL means to set all flags.  NONE means to set no flags. It is important
           that if you don't want any flag to be set, you request it explicitly because in some
           cases the SYN flag may be set by default. Here is a brief description of the meaning
           of each flag:

           CWR (Congestion Window Reduced) .
               Set by an ECN-Capable sender when it reduces its congestion window (due to a
               retransmit timeout, a fast retransmit or in response to an ECN notification.

           ECN (Explicit Congestion Notification) .
               During the three-way handshake it indicates that sender is capable of performing
               explicit congestion notification. Normally it means that a packet with the IP
               Congestion Experienced flag set was received during normal transmission. See RFC
               3168.  for more information.

           URG (Urgent) .
               Segment is urgent and the urgent pointer field carries valid information.

           ACK (Acknowledgement) .
               The segment carries an acknowledgement and the value of the acknowledgement number
               field is valid and contains the next sequence number that is expected from the
               receiver.

           PSH (Push) .
               The data in this segment should be immediately pushed to the application layer on
               arrival.

           RST (Reset) .
               There was some problem and the sender wants to abort the connection.

           SYN (Synchronize) .
               The segment is a request to synchronize sequence numbers and establish a
               connection. The sequence number field contains the sender's initial sequence
               number.

           FIN (Finish) .
               The sender wants to close the connection.

       --win size (Window Size) .
           Specifies the TCP window size, this is, the number of octets the sender of the segment
           is willing to accept from the receiver at one time. This is usually the size of the
           reception buffer that the OS allocates for a given connection.  size must be a number
           in the range [0–65535].

       --badsum (Invalid Checksum) .
           Asks Nping to use an invalid TCP checksum for the packets sent to target hosts. Since
           virtually all host IP stacks properly drop these packets, any responses received are
           likely coming from a firewall or an IDS that didn't bother to verify the checksum. For
           more details on this technique, see https://nmap.org/p60-12.html.

UDP MODE

       -p port_spec, --dest-port port_spec (Target ports) .
           This option specifies which ports you want UDP datagrams to be sent to. It can be a
           single port, a comma-separated list of ports (e.g.  80,443,8080), a range (e.g.
           1-1023), and any combination of those (e.g.  21-25,80,443,1024-2048). The beginning
           and/or end values of a range may be omitted, causing Nping to use 1 and 65535,
           respectively. So you can specify -p- to target ports from 1 through 65535. Using port
           zero is allowed if you specify it explicitly.

       -g portnumber, --source-port portnumber (Spoof source port) .
           This option asks Nping to use the specified port as source port for the transmitted
           datagrams. Note that this might not work on all systems or may require root
           privileges. Specified value must be an integer in the range [0–65535].

       --badsum (Invalid Checksum)
           Asks Nping to use an invalid UDP checksum for the packets sent to target hosts. Since
           virtually all host IP stacks properly drop these packets, any responses received are
           likely coming from a firewall or an IDS that didn't bother to verify the checksum. For
           more details on this technique, see https://nmap.org/p60-12.html.

ICMP MODE

       --icmp-type type (ICMP type) .
           This option specifies which type of ICMP messages should be generated.  type can be
           supplied in two different ways. You can use the official type numbers assigned by
           IANA[1] (e.g.  --icmp-type 8 for ICMP Echo Request), or you can use any of the
           mnemonics listed in the section called “ICMP Types”.

       --icmp-code code (ICMP code) .
           This option specifies which ICMP code should be included in the generated ICMP
           messages.  code can be supplied in two different ways. You can use the official code
           numbers assigned by IANA[1] (e.g.  --icmp-code 1 for Fragment Reassembly Time
           Exceeded), or you can use any of the mnemonics listed in the section called “ICMP
           Codes”.

       --icmp-id id (ICMP identifier) .
           This option specifies the value of the identifier used in some of the ICMP messages.
           In general it is used to match request and reply messages.  id must be a number in the
           range [0–65535].

       --icmp-seq seq (ICMP sequence) .
           This option specifies the value of the sequence number field used in some ICMP
           messages. In general it is used to match request and reply messages.  id must be a
           number in the range [0–65535].

       --icmp-redirect-addr addr (ICMP Redirect address) .
           This option sets the address field in ICMP Redirect messages. In other words, it sets
           the IP address of the router that should be used when sending IP datagrams to the
           original destination.  addr can be either an IPv4 address or a hostname.

       --icmp-param-pointer pointer (ICMP Parameter Problem pointer) .
           This option specifies the pointer that indicates the location of the problem in ICMP
           Parameter Problem messages.  pointer should be a number in the range [0–255]. Normally
           this option is only used when ICMP code is set to 0 ("Pointer indicates the error").

       --icmp-advert-lifetime ttl (ICMP Router Advertisement Lifetime) .
           This option specifies the router advertisement lifetime, this is, the number of
           seconds the information carried in an ICMP Router Advertisement can be considered
           valid for.  ttl must be a positive integer in the range [0–65535].

       --icmp-advert-entry addr,pref (ICMP Router Advertisement Entry) .
           This option adds a Router Advertisement entry to an ICMP Router Advertisement message.
           The parameter must be two values separated by a comma.  addr is the router's IP and
           can be specified either as an IP address in dot-decimal notation or as a hostname.
           pref is the preference level for the specified IP. It must be a number in the range
           [0–4294967295]. An example is --icmp-advert-entry 192.168.128.1,3.

       --icmp-orig-time timestamp (ICMP Originate Timestamp) .
           This option sets the Originate Timestamp in ICMP Timestamp messages. The Originate
           Timestamp is expressed as the number of milliseconds since midnight UTC and it
           corresponds to the time the sender last touched the Timestamp message before its
           transmission.  timestamp can be specified as a regular time (e.g.  10s, 3h, 1000ms),
           or the special string now. You can add or subtract values from now, for example
           --icmp-orig-time now-2s, --icmp-orig-time now+1h, --icmp-orig-time now+200ms.

       --icmp-recv-time timestamp (ICMP Receive Timestamp) .
           This option sets the Receive Timestamp in ICMP Timestamp messages. The Receive
           Timestamp is expressed as the number of milliseconds since midnight UTC and it
           corresponds to the time the echoer first touched the Timestamp message on receipt.
           timestamp is as with --icmp-orig-time.

       --icmp-trans-time timestamp (ICMP Transmit Timestamp) .
           This option sets the Transmit Timestamp in ICMP Timestamp messages. The Transmit
           Timestamp is expressed as the number of milliseconds since midnight UTC and it
           corresponds to the time the echoer last touched the Timestamp message before its
           transmission.  timestamp is as with --icmp-orig-time.

   ICMP Types
       These identifiers may be used as mnemonics for the ICMP type numbers given to the
       --icmp-type.  option. In general there are three forms of each identifier: the full name
       (e.g.  destination-unreachable), the short name (e.g.  dest-unr), or the initials (e.g.
       du). In ICMP types that request something, the word "request" is omitted.

       echo-reply, echo-rep, er
           Echo Reply (type 0). This message is sent in response to an Echo Request message.

       destination-unreachable, dest-unr, du
           Destination Unreachable (type 3). This message indicates that a datagram could not be
           delivered to its destination.

       source-quench, sour-que, sq
           Source Quench (type 4). This message is used by a congested IP device to tell other
           device that is sending packets too fast and that it should slow down.

       redirect, redi, r
           Redirect (type 5). This message is normally used by routers to inform a host that
           there is a better route to use for sending datagrams. See also the
           --icmp-redirect-addr option.

       echo-request, echo, e
           Echo Request (type 8). This message is used to test the connectivity of another device
           on a network.

       router-advertisement, rout-adv, ra
           Router Advertisement (type 9). This message is used by routers to let hosts know of
           their existence and capabilities. See also the --icmp-advert-lifetime option.

       router-solicitation, rout-sol, rs
           Router Solicitation (type 10). This message is used by hosts to request Router
           Advertisement messages from any listening routers.

       time-exceeded, time-exc, te
           Time Exceeded (type 11). This message is generated by some intermediate device
           (normally a router) to indicate that a datagram has been discarded before reaching its
           destination because the IP TTL expired.

       parameter-problem, member-pro, pp
           Parameter Problem (type 12). This message is used when a device finds a problem with a
           parameter in an IP header and it cannot continue processing it. See also the
           --icmp-param-pointer option.

       timestamp, time, tm
           Timestamp Request (type 13). This message is used to request a device to send a
           timestamp value for propagation time calculation and clock synchronization. See also
           the --icmp-orig-time, --icmp-recv-time, and --icmp-trans-time.

       timestamp-reply, time-rep, tr
           Timestamp Reply (type 14). This message is sent in response to a Timestamp Request
           message.

       information, info, i
           Information Request (type 15). This message is now obsolete but it was originally used
           to request configuration information from another device.

       information-reply, info-rep, ir
           Information Reply (type 16). This message is now obsolete but it was originally sent
           in response to an Information Request message to provide configuration information.

       mask-request, mask, m
           Address Mask Request (type 17). This message is used to ask a device to send its
           subnet mask.

       mask-reply, mask-rep, mr
           Address Mask Reply (type 18). This message contains a subnet mask and is sent in
           response to a Address Mask Request message.

       traceroute, trace, tc
           Traceroute (type 30). This message is normally sent by an intermediate device when it
           receives an IP datagram with a traceroute option. ICMP Traceroute messages are still
           experimental, see RFC 1393.  for more information.

   ICMP Codes
       These identifiers may be used as mnemonics for the ICMP code numbers given to the
       --icmp-code.  option. They are listed by the ICMP type they correspond to.

       Destination Unreachable
           network-unreachable, netw-unr, net
               Code 0. Datagram could not be delivered to its destination network (probably due
               to some routing problem).

           host-unreachable, host-unr, host
               Code 1. Datagram was delivered to the destination network but it was impossible to
               reach the specified host (probably due to some routing problem).

           protocol-unreachable, prot-unr, proto
               Code 2. The protocol specified in the Protocol field of the IP datagram is not
               supported by the host to which the datagram was delivered.

           port-unreachable, port-unr, port
               Code 3. The TCP/UDP destination port was invalid.

           needs-fragmentation, need-fra, frag
               Code 4. Datagram had the DF bit set but it was too large for the MTU of the next
               physical network so it had to be dropped.

           source-route-failed, sour-rou, routefail
               Code 5. IP datagram had a Source Route option but a router couldn't pass it to the
               next hop.

           network-unknown, netw-unk, net?
               Code 6. Destination network is unknown. This code is never used. Instead, Network
               Unreachable is used.

           host-unknown, host-unk, host?
               Code 7. Specified host is unknown. Usually generated by a router local to the
               destination host to inform of a bad address.

           host-isolated, host-iso, isolated
               Code 8. Source Host Isolated. Not used.

           network-prohibited, netw-pro, !net
               Code 9. Communication with destination network is administratively prohibited
               (source device is not allowed to send packets to the destination network).

           host-prohibited, host-pro, !host
               Code 10. Communication with destination host is administratively prohibited. (The
               source device is allowed to send packets to the destination network but not to the
               destination device.)

           network-tos, unreachable-network-tos, netw-tos, tosnet
               Code 11. Destination network unreachable because it cannot provide the type of
               service specified in the IP TOS field.

           host-tos, unreachable-host-tos, toshost
               Code 12. Destination host unreachable because it cannot provide the type of
               service specified in the IP TOS field.

           communication-prohibited, comm-pro, !comm
               Code 13. Datagram could not be forwarded due to filtering that blocks the message
               based on its contents.

           host-precedence-violation, precedence-violation, prec-vio, violation
               Code 14. Precedence value in the IP TOS field is not permitted.

           precedence-cutoff, prec-cut, cutoff
               Code 15. Precedence value in the IP TOS field is lower than the minimum allowed
               for the network.

       Redirect
           redirect-network, redi-net, net
               Code 0. Redirect all future datagrams with the same destination network as the
               original datagram, to the router specified in the Address field. The use of this
               code is prohibited by RFC 1812..

           redirect-host, redi-host, host
               Code 1. Redirect all future datagrams with the same destination host as the
               original datagram, to the router specified in the Address field.

           redirect-network-tos, redi-ntos, redir-ntos
               Code 2. Redirect all future datagrams with the same destination network and IP TOS
               value as the original datagram, to the router specified in the Address field. The
               use of this code is prohibited by RFC 1812.

           redirect-host-tos, redi-htos, redir-htos
               Code 3. Redirect all future datagrams with the same destination host and IP TOS
               value as the original datagram, to the router specified in the Address field.

       Router Advertisement
           normal-advertisement, norm-adv, normal, zero, default, def
               Code 0. Normal router advertisement. In Mobile IP: Mobility agent can act as a
               router for IP datagrams not related to mobile nodes.

           not-route-common-traffic, not-rou, mobile-ip, !route, !commontraffic
               Code 16. Used for Mobile IP. The mobility agent does not route common traffic. All
               foreign agents must forward to a default router any datagrams received from a
               registered mobile node

       Time Exceeded
           ttl-exceeded-in-transit, ttl-exc, ttl-transit
               Code 0. IP Time To Live expired during transit.

           fragment-reassembly-time-exceeded, frag-exc, frag-time
               Code 1. Fragment reassembly time has been exceeded.

       Parameter Problem
           pointer-indicates-error, poin-ind, pointer
               Code 0. The pointer field indicates the location of the problem. See the
               --icmp-param-pointer option.

           missing-required-option, miss-option, option-missing
               Code 1. IP datagram was expected to have an option that is not present.

           bad-length, bad-len, badlen
               Code 2. The length of the IP datagram is incorrect.

ARP MODE

       --arp-type type (ICMP Type) .
           This option specifies which type of ARP messages should be generated.  type can be
           supplied in two different ways. You can use the official numbers assigned by IANA[2]
           (e.g.  --arp-type 1 for ARP Request), or you can use one of the mnemonics from the
           section called “ARP Types”.

       --arp-sender-mac mac (Sender MAC address) .
           This option sets the Sender Hardware Address field of the ARP header. Although ARP
           supports many types of link layer addresses, currently Nping only supports MAC
           addresses.  mac must be specified using the traditional MAC notation (e.g.
           00:0a:8a:32:f4:ae). You can also use hyphens as separators (e.g.  00-0a-8a-32-f4-ae).

       --arp-sender-ip addr (Sender IP address) .
           This option sets the Sender IP field of the ARP header.  addr can be given as an IPv4
           address or a hostname.

       --arp-target-mac mac (target MAC address) .
           This option sets the Target Hardware Address field of the ARP header.

       --arp-target-ip addr (target ip address) .
           This option sets the Target IP field of the ARP header.

   ARP Types
       These identifiers may be used as mnemonics for the ARP type numbers given to the
       --arp-type.  option.

       arp-request, arp, a
           ARP Request (type 1). ARP requests are used to translate network layer addresses
           (normally IP addresses) to link layer addresses (usually MAC addresses). Basically,
           and ARP request is a broadcasted message that asks the host in the same network
           segment that has a given IP address to provide its MAC address.

       arp-reply, arp-rep, ar
           ARP Reply (type 2). An ARP reply is a message that a host sends in response to an ARP
           request to provide its link layer address.

       rarp-request, rarp, r
           RARP Requests (type 3). RARP requests are used to translate a link layer address
           (normally a MAC address) to a network layer address (usually an IP address). Basically
           a RARP request is a broadcasted message sent by a host that wants to know his own IP
           address because it doesn't have any. It was the first protocol designed to solve the
           bootstrapping problem. However, RARP is now obsolete and DHCP is used instead. For
           more information about RARP see RFC 903..

       rarp-reply, rarp-rep, rr
           RARP Reply (type 4). A RARP reply is a message sent in response to a RARP request to
           provide an IP address to the host that sent the RARP request in the first place.

       drarp-request, drarp, d
           Dynamic RARP Request (type 5). Dynamic RARP is an extension to RARP used to obtain or
           assign a network layer address from a fixed link layer address. DRARP was used mainly
           in Sun Microsystems platforms in the late 90's but now it's no longer used. See RFC
           1931.  for more information.

       drarp-reply, drarp-rep, dr
           Dynamic RARP Reply (type 6). A DRARP reply is a message sent in response to a RARP
           request to provide network layer address.

       drarp-error, drarp-err, de
           DRARP Error (type 7). DRARP Error messages are usually sent in response to DRARP
           requests to inform of some error. In DRARP Error messages, the Target Protocol Address
           field is used to carry an error code (usually in the first byte). The error code is
           intended to tell why no target protocol address is being returned. For more
           information see RFC 1931.

       inarp-request, inarp, i
           Inverse ARP Request (type 8). InARP requests are used to translate a link layer
           address to a network layer address. It is similar to RARP request but in this case,
           the sender of the InARP request wants to know the network layer address of another
           node, not its own address. InARP is mainly used in Frame Relay and ATM networks. For
           more information see RFC 2390..

       inarp-reply, inarp-rep, ir
           Inverse ARP Reply (type 9). InARP reply messages are sent in response to InARP
           requests to provide the network layer address associated with the host that has a
           given link layer address.

       arp-nak, an
           ARP NAK (type 10). ARP NAK messages are an extension to the ATMARP protocol and they
           are used to improve the robustness of the ATMARP server mechanism. With ARP NAK, a
           client can determine the difference between a catastrophic server failure and an
           ATMARP table lookup failure. See RFC 1577.  for more information.

IPV4 OPTIONS

       -S addr, --source-ip addr (Source IP Address) .
           Sets the source IP address. This option lets you specify a custom IP address to be
           used as source IP address in sent packets. This allows spoofing the sender of the
           packets.  addr can be an IPv4 address or a hostname.

       --dest-ip addr (Destination IP Address) .
           Adds a target to Nping's target list. This option is provided for consistency but its
           use is deprecated in favor of plain target specifications. See the section called
           “TARGET SPECIFICATION”.

       --tos tos (Type of Service) .
           Sets the IP TOS field. The TOS field is used to carry information to provide quality
           of service features. It is normally used to support a technique called Differentiated
           Services. See RFC 2474.  for more information.  tos must be a number in the range
           [0–255].

       --id id (Identification) .
           Sets the IPv4 Identification field. The Identification field is a 16-bit value that is
           common to all fragments belonging to a particular message. The value is used by the
           receiver to reassemble the original message from the fragments received.  id must be a
           number in the range [0–65535].

       --df (Don't Fragment) .
           Sets the Don't Fragment bit in sent packets. When an IP datagram has its DF flag set,
           intermediate devices are not allowed to fragment it so if it needs to travel across a
           network with a MTU smaller that datagram length the datagram will have to be dropped.
           Normally an ICMP Destination Unreachable message is generated and sent back to the
           sender.

       --mf (More Fragments) .
           Sets the More Fragments bit in sent packets. The MF flag is set to indicate the
           receiver that the current datagram is a fragment of some larger datagram. When set to
           zero it indicates that the current datagram is either the last fragment in the set or
           that it is the only fragment.

       --ttl hops (Time To Live) .
           Sets the IPv4 Time-To-Live (TTL) field in sent packets to the given value. The TTL
           field specifies how long the datagram is allowed to exist on the network. It was
           originally intended to represent a number of seconds but it actually represents the
           number of hops a packet can traverse before being dropped. The TTL tries to avoid a
           situation in which undeliverable datagrams keep being forwarded from one router to
           another endlessly.  hops must be a number in the range [0–255].

       --badsum-ip (Invalid IP checksum) .
           Asks Nping to use an invalid IP checksum for packets sent to target hosts. Note that
           some systems (like most Linux kernels), may fix the checksum before placing the packet
           on the wire, so even if Nping shows the incorrect checksum in its output, the packets
           may be transparently corrected by the kernel.

       --ip-options S|R [route]|L [route]|T|U ..., --ip-options hex string (IP Options) .
           The IP protocol offers several options which may be placed in packet headers. Unlike
           the ubiquitous TCP options, IP options are rarely seen due to practicality and
           security concerns. In fact, many Internet routers block the most dangerous options
           such as source routing. Yet options can still be useful in some cases for determining
           and manipulating the network route to target machines. For example, you may be able to
           use the record route option to determine a path to a target even when more traditional
           traceroute-style approaches fail. Or if your packets are being dropped by a certain
           firewall, you may be able to specify a different route with the strict or loose source
           routing options.

           The most powerful way to specify IP options is to simply pass in hexadecimal data as
           the argument to --ip-options. Precede each hex byte value with \x. You may repeat
           certain characters by following them with an asterisk and then the number of times you
           wish them to repeat. For example, \x01\x07\x04\x00*4 is the same as
           \x01\x07\x04\x00\x00\x00\x00.

           Note that if you specify a number of bytes that is not a multiple of four, an
           incorrect IP header length will be set in the IP packet. The reason for this is that
           the IP header length field can only express multiples of four. In those cases, the
           length is computed by dividing the header length by 4 and rounding down. This will
           affect the way the header that follows the IP header is interpreted, showing bogus
           information in Nping or in the output of any sniffer. Although this kind of situation
           might be useful for some stack stress tests, users would normally want to specify
           explicit padding, so the correct header length is set.

           Nping also offers a shortcut mechanism for specifying options. Simply pass the letter
           R, T, or U to request record-route, record-timestamp, or both options together,
           respectively. Loose or strict source routing may be specified with an L or S followed
           by a space and then a space-separated list of IP addresses.

           For more information and examples of using IP options with Nping, see the mailing list
           post at http://seclists.org/nmap-dev/2006/q3/0052.html.

       --mtu size (Maximum Transmission Unit) .
           This option sets a fictional MTU in Nping so IP datagrams larger than size are
           fragmented before transmission.  size must be specified in bytes and corresponds to
           the number of octets that can be carried on a single link-layer frame.

IPV6 OPTIONS

       -6, --ipv6 (Use IPv6) .
           Tells Nping to use IP version 6 instead of the default IPv4. It is generally a good
           idea to specify this option as early as possible in the command line so Nping can
           parse it soon and know in advance that the rest of the parameters refer to IPv6. The
           command syntax is the same as usual except that you also add the -6 option. Of course,
           you must use IPv6 syntax if you specify an address rather than a hostname. An address
           might look like 3ffe:7501:4819:2000:210:f3ff:fe03:14d0, so hostnames are recommended.

           While IPv6 hasn't exactly taken the world by storm, it gets significant use in some
           (usually Asian) countries and most modern operating systems support it. To use Nping
           with IPv6, both the source and target of your packets must be configured for IPv6. If
           your ISP (like most of them) does not allocate IPv6 addresses to you, free tunnel
           brokers are widely available and work fine with Nping. You can use the free IPv6
           tunnel broker service at http://www.tunnelbroker.net.

           Please note that IPv6 support is still highly experimental and many modes and options
           may not work with it.

       -S addr, --source-ip addr (Source IP Address) .
           Sets the source IP address. This option lets you specify a custom IP address to be
           used as source IP address in sent packets. This allows spoofing the sender of the
           packets.  addr can be an IPv6 address or a hostname.

       --dest-ip addr (Destination IP Address) .
           Adds a target to Nping's target list. This option is provided for consistency but its
           use is deprecated in favor of plain target specifications. See the section called
           “TARGET SPECIFICATION”.

       --flow label (Flow Label) .
           Sets the IPv6 Flow Label. The Flow Label field is 20 bits long and is intended to
           provide certain quality-of-service properties for real-time datagram delivery.
           However, it has not been widely adopted, and not all routers or endpoints support it.
           Check RFC 2460.  for more information.  label must be an integer in the range
           [0–1048575].

       --traffic-class class (Traffic Class) .
           Sets the IPv6 Traffic Class. This field is similar to the TOS field in IPv4, and is
           intended to provide the Differentiated Services method, enabling scalable service
           discrimination in the Internet without the need for per-flow state and signaling at
           every hop. Check RFC 2474.  for more information.  class must be an integer in the
           range [0–255].

       --hop-limit hops (Hop Limit) .
           Sets the IPv6 Hop Limit field in sent packets to the given value. The Hop Limit field
           specifies how long the datagram is allowed to exist on the network. It represents the
           number of hops a packet can traverse before being dropped. As with the TTL in IPv4,
           IPv6 Hop Limit tries to avoid a situation in which undeliverable datagrams keep being
           forwarded from one router to another endlessly.  hops must be a number in the range
           [0–255].

ETHERNET OPTIONS

       In most cases Nping sends packets at the raw IP level. This means that Nping creates its
       own IP packets and transmits them through a raw socket. However, in some cases it may be
       necessary to send packets at the raw Ethernet level. This happens, for example, when Nping
       is run under Windows (as Microsoft has disabled raw socket support since Windows XP SP2),
       or when Nping is asked to send ARP packets. Since in some cases it is necessary to
       construct ethernet frames, Nping offers some options to manipulate the different fields.

       --dest-mac mac (Ethernet Destination MAC Address) .
           This option sets the destination MAC address that should be set in outgoing Ethernet
           frames. This is useful in case Nping can't determine the next hop's MAC address or
           when you want to route probes through a router other than the configured default
           gateway. The MAC address should have the usual format of six colon-separated bytes,
           e.g.  00:50:56:d4:01:98. Alternatively, hyphens may be used instead of colons. Use the
           word random or rand to generate a random address, and broadcast or bcast to use
           ff:ff:ff:ff:ff:ff. If you set up a bogus destination MAC address your probes may not
           reach the intended targets.

       --source-mac mac (Ethernet Source MAC Address) .
           This option sets the source MAC address that should be set in outgoing Ethernet
           frames. This is useful in case Nping can't determine your network interface MAC
           address or when you want to inject traffic into the network while hiding your network
           card's real address. The syntax is the same as for --dest-mac. If you set up a bogus
           source MAC address you may not receive probe replies.

       --ether-type type (Ethertype) .
           This option sets the Ethertype field of the ethernet frame. The Ethertype is used to
           indicate which protocol is encapsulated in the payload.  type can be supplied in two
           different ways. You can use the official numbers listed by the IEEE[3] (e.g.
           --ether-type 0x0800 for IP version 4), or one of the mnemonics from the section called
           “Ethernet Types”.

   Ethernet Types
       These identifiers may be used as mnemonics for the Ethertype numbers given to the
       --arp-type.  option.

       ipv4, ip, 4
           Internet Protocol version 4 (type 0x0800).

       ipv6, 6
           Internet Protocol version 6 (type 0x86DD).

       arp
           Address Resolution Protocol (type 0x0806).

       rarp
           Reverse Address Resolution Protocol (type 0x8035).

       frame-relay, frelay, fr
           Frame Relay (type 0x0808).

       ppp
           Point-to-Point Protocol (type 0x880B).

       gsmp
           General Switch Management Protocol (type 0x880C).

       mpls
           Multiprotocol Label Switching (type 0x8847).

       mps-ual, mps
           Multiprotocol Label Switching with Upstream-assigned Label (type 0x8848).

       mcap
           Multicast Channel Allocation Protocol (type 0x8861).

       pppoe-discovery, pppoe-d
           PPP over Ethernet Discovery Stage (type 0x8863).

       pppoe-session, pppoe-s
           PPP over Ethernet Session Stage (type 0x8864).

       ctag
           Customer VLAN Tag Type (type 0x8100).

       epon
           Ethernet Passive Optical Network (type 0x8808).

       pbnac
           Port-based network access control (type 0x888E).

       stag
           Service VLAN tag identifier (type 0x88A8).

       ethexp1
           Local Experimental Ethertype 1 (type 0x88B5).

       ethexp2
           Local Experimental Ethertype 2 (type 0x88B6).

       ethoui
           OUI Extended Ethertype (type 0x88B7).

       preauth
           Pre-Authentication (type 0x88C7).

       lldp
           Link Layer Discovery Protocol (type 0x88CC).

       mac-security, mac-sec, macsec
           Media Access Control Security (type 0x88E5).

       mvrp
           Multiple VLAN Registration Protocol (type 0x88F5).

       mmrp
           Multiple Multicast Registration Protocol (type 0x88F6).

       frrr
           Fast Roaming Remote Request (type 0x890D).

PAYLOAD OPTIONS

       --data hex string (Append custom binary data to sent packets) .
           This option lets you include binary data as payload in sent packets.  hex string may
           be specified in any of the following formats: 0xAABBCCDDEEFF..., AABBCCDDEEFF...  or
           \xAA\xBB\xCC\xDD\xEE\xFF.... Examples of use are --data 0xdeadbeef and --data
           \xCA\xFE\x09. Note that if you specify a number like 0x00ff no byte-order conversion
           is performed. Make sure you specify the information in the byte order expected by the
           receiver.

       --data-string string (Append custom string to sent packets) .
           This option lets you include a regular string as payload in sent packets.  string can
           contain any string. However, note that some characters may depend on your system's
           locale and the receiver may not see the same information. Also, make sure you enclose
           the string in double quotes and escape any special characters from the shell. Example:
           --data-string "Jimmy Jazz...".

       --data-length len (Append random data to sent packets) .
           This option lets you include len random bytes of data as payload in sent packets.  len
           must be an integer in the range [0–65400]. However, values higher than 1400 are not
           recommended because it may not be possible to transmit packets due to network MTU
           limitations.

ECHO MODE

       The "Echo Mode" is a novel technique implemented by Nping which lets users see how network
       packets change in transit, from the host where they originated to the target machine.
       Basically, the Echo mode turns Nping into two different pieces: the Echo server and the
       Echo client. The Echo server is a network service that has the ability to capture packets
       from the network and send a copy ("echo them") to the originating client through a side
       TCP channel. The Echo client is the part that generates such network packets, transmits
       them to the server, and receives their echoed version through a side TCP channel that it
       has previously established with the Echo server.

       This scheme lets the client see the differences between the packets that it sends and what
       is actually received by the server. By having the server send back copies of the received
       packets through the side channel, things like NAT devices become immediately apparent to
       the client because it notices the changes in the source IP address (and maybe even source
       port). Other devices like those that perform traffic shaping, changing TCP window sizes or
       adding TCP options transparently between hosts, turn up too.

       The Echo mode is also useful for troubleshooting routing and firewall issues. Among other
       things, it can be used to determine if the traffic generated by the Nping client is being
       dropped in transit and never gets to its destination or if the responses are the ones that
       don't get back to it.

       Internally, client and server communicate over an encrypted and authenticated channel,
       using the Nping Echo Protocol (NEP), whose technical specification can be found in
       https://nmap.org/svn/nping/docs/EchoProtoRFC.txt

       The following paragraphs describe the different options available in Nping's Echo mode.

       --ec passphrase, --echo-client passphrase (Run Echo client) .
           This option tells Nping to run as an Echo client.  passphrase is a sequence of ASCII
           characters that is used used to generate the cryptographic keys needed for encryption
           and authentication in a given session. The passphrase should be a secret that is also
           known by the server, and it may contain any number of printable ASCII characters.
           Passphrases that contain whitespace or special characters must be enclosed in double
           quotes.

           When running Nping as an Echo client, most options from the regular raw probe modes
           apply. The client may be configured to send specific probes using flags like --tcp,
           --icmp or --udp. Protocol header fields may be manipulated normally using the
           appropriate options (e.g.  --ttl, --seq, --icmp-type, etc.). The only exceptions are
           ARP-related flags, which are not supported in Echo mode, as protocols like ARP are
           closely related to the data link layer and its probes can't pass through different
           network segments.

       --es passphrase, --echo-server passphrase (Run Echo server) .
           This option tells Nping to run as an Echo server.  passphrase is a sequence of ASCII
           characters that is used used to generate the cryptographic keys needed for encryption
           and authentication in a given session. The passphrase should be a secret that is also
           known by the clients, and it may contain any number of printable ASCII characters.
           Passphrases that contain whitespace or special characters must be enclosed in double
           quotes. Note that although it is not recommended, it is possible to use empty
           passphrases, supplying --echo-server "". However, if what you want is to set up an
           open Echo server, it is better to use option --no-crypto. See below for details.

       --ep port, --echo-port port (Set Echo TCP port number) .
           This option asks Nping to use the specified TCP port number for the Echo side channel
           connection. If this option is used with --echo-server, it specifies the port on which
           the server listens for connections. If it is used with --echo-client, it specifies the
           port to connect to on the remote host. By default, port number 9929 is used.

       --nc, --no-crypto (Disable encryption and authentication) .
           This option asks Nping not to use any cryptographic operations during an Echo session.
           In practical terms, this means that the Echo side channel session data will be
           transmitted in the clear, and no authentication will be performed by the server or
           client during the session establishment phase. When --no-crypto is used, the
           passphrase supplied with --echo-server or --echo-client is ignored.

           This option must be specified if Nping was compiled without openSSL support. Note
           that, for technical reasons, a passphrase still needs to be supplied after the
           --echo-client or --echo-server flags, even though it will be ignored.

           The --no-crypto flag might be useful when setting up a public Echo server, because it
           allows users to connect to the Echo server without the need for any passphrase or
           shared secret. However, it is strongly recommended to not use --no-crypto unless
           absolutely necessary. Public Echo servers should be configured to use the passphrase
           "public" or the empty passphrase (--echo-server "") as the use of cryptography does
           not only provide confidentiality and authentication but also message integrity.

       --once (Serve one client and quit) .
           This option asks the Echo server to quit after serving one client. This is useful when
           only a single Echo session wants to be established as it eliminates the need to access
           the remote host to shutdown the server.

       --safe-payloads (Zero application data before echoing a packet) .
           This option asks the Echo server to erase any application layer data found in client
           packets before echoing them. When the option is enabled, the Echo server parses the
           packets received from Echo clients and tries to determine if they contain data beyond
           the transport layer. If such data is found, it is overwritten with zeroes before
           transmitting the packets to the appropriate Echo client.

           Echo servers can handle multiple simultaneous clients running multiple echo sessions
           in parallel. In order to determine which packet needs to be echoed to which client and
           through which session, the Echo server uses an heuristic algorithm. Although we have
           taken every security measure that we could think of to prevent that a client receives
           an echoed packet that it did not generate, there is always a risk that our algorithm
           makes a mistake and delivers a packet to the wrong client. The --safe-payloads option
           is useful for public echo servers or critical deployments where that kind of mistake
           cannot be afforded.

       The following examples illustrate how Nping's Echo mode can be used to discover
       intermediate devices.

       Example 2. Discovering NAT devices

               # nping --echo-client "public" echo.nmap.org --udp

               Starting Nping ( https://nmap.org/nping )
               SENT (1.0970s) UDP 10.1.20.128:53 > 178.79.165.17:40125 ttl=64 id=32523 iplen=28
               CAPT (1.1270s) UDP 80.38.10.21:45657 > 178.79.165.17:40125 ttl=54 id=32523 iplen=28
               RCVD (1.1570s) ICMP 178.79.165.17 > 10.1.20.128 Port unreachable (type=3/code=3) ttl=49 id=16619 iplen=56
               [...]
               SENT (5.1020s) UDP 10.1.20.128:53 > 178.79.165.17:40125 ttl=64 id=32523 iplen=28
               CAPT (5.1335s) UDP 80.38.10.21:45657 > 178.79.165.17:40125 ttl=54 id=32523 iplen=28
               RCVD (5.1600s) ICMP 178.79.165.17 > 10.1.20.128 Port unreachable (type=3/code=3) ttl=49 id=16623 iplen=56

               Max rtt: 60.628ms | Min rtt: 58.378ms | Avg rtt: 59.389ms
               Raw packets sent: 5 (140B) | Rcvd: 5 (280B) | Lost: 0 (0.00%)| Echoed: 5 (140B)
               Tx time: 4.00459s | Tx bytes/s: 34.96 | Tx pkts/s: 1.25
               Rx time: 5.00629s | Rx bytes/s: 55.93 | Rx pkts/s: 1.00
               Nping done: 1 IP address pinged in 6.18 seconds

       The output clearly shows the presence of a NAT device in the client's local network. Note
       how the captured packet (CAPT) differs from the SENT packet: the source address for the
       original packets is in the reserved 10.0.0.0/8 range, while the address seen by the server
       is 80.38.10.21, the Internet side address of the NAT device. The source port was also
       modified by the device. The line starting with RCVD corresponds to the responses generated
       by the TCP/IP stack of the machine where the Echo server is run.

       Example 3. Discovering a transparent proxy

               # nping --echo-client "public" echo.nmap.org --tcp -p80

               Starting Nping ( https://nmap.org/nping )
               SENT (1.2160s) TCP 10.0.1.77:41659 > 178.79.165.17:80 S ttl=64 id=3317 iplen=40  seq=567704200 win=1480
               RCVD (1.2180s) TCP 178.79.165.17:80 > 10.0.1.77:41659 SA ttl=128 id=13177 iplen=44  seq=3647106954 win=16384 <mss 1460>
               SENT (2.2150s) TCP 10.0.1.77:41659 > 178.79.165.17:80 S ttl=64 id=3317 iplen=40  seq=567704200 win=1480
               SENT (3.2180s) TCP 10.0.1.77:41659 > 178.79.165.17:80 S ttl=64 id=3317 iplen=40  seq=567704200 win=1480
               SENT (4.2190s) TCP 10.0.1.77:41659 > 178.79.165.17:80 S ttl=64 id=3317 iplen=40  seq=567704200 win=1480
               SENT (5.2200s) TCP 10.0.1.77:41659 > 178.79.165.17:80 S ttl=64 id=3317 iplen=40  seq=567704200 win=1480

               Max rtt: 2.062ms | Min rtt: 2.062ms | Avg rtt: 2.062ms
               Raw packets sent: 5 (200B) | Rcvd: 1 (46B) | Lost: 4 (80.00%)| Echoed: 0 (0B)
               Tx time: 4.00504s | Tx bytes/s: 49.94 | Tx pkts/s: 1.25
               Rx time: 5.00618s | Rx bytes/s: 9.19 | Rx pkts/s: 0.20
               Nping done: 1 IP address pinged in 6.39 seconds

       In this example, the output is a bit more tricky. The absence of error messages shows that
       the Echo client has successfully established an Echo session with the server. However, no
       CAPT packets can be seen in the output. This means that none of the transmitted packets
       reached the server. Interestingly, a TCP SYN-ACK packet was received in response to the
       first TCP-SYN packet (and also, it is known that the target host does not have port 80
       open). This behavior reveals the presence of a transparent web proxy cache server (which
       in this case is an old MS ISA server).

TIMING AND PERFORMANCE OPTIONS

       --delay time (Delay between probes) .
           This option lets you control for how long will Nping wait before sending the next
           probe. Like in many other ping tools, the default delay is one second.  time must be a
           positive integer or floating point number. By default it is specified in seconds,
           however you can give an explicit unit by appending ms for milliseconds, s for seconds,
           m for minutes, or h for hours (e.g.  2.5s, 45m, 2h).

       --rate rate (Send probes at a given rate) .
           This option specifies the number of probes that Nping should send per second. This
           option and --delay are inverses; --rate 20 is the same as --delay 0.05. If both
           options are used, only the last one in the parameter list counts.

MISCELLANEOUS OPTIONS

       -h, --help (Display help) .
           Displays help information and exits.

       -V, --version (Display version) .
           Displays the program's version number and quits.

       -c rounds, --count rounds (Stop after a given number of rounds) .
           This option lets you specify the number of times that Nping should loop over target
           hosts (and in some cases target ports). Nping calls these “rounds”. In a basic
           execution with only one target (and only one target port in TCP/UDP modes), the number
           of rounds matches the number of probes sent to the target host. However, in more
           complex executions where Nping is run against multiple targets and multiple ports, the
           number of rounds is the number of times that Nping sends a complete set of probes that
           covers all target IPs and all target ports. For example, if Nping is asked to send TCP
           SYN packets to hosts 192.168.1.0-255 and ports 80 and 433, then 256 × 2 = 512 packets
           are sent in one round. So if you specify -c 100, Nping will loop over the different
           target hosts and ports 100 times, sending a total of 256 × 2 × 100 = 51200 packets. By
           default Nping runs for 5 rounds. If a value of 0 is specified, Nping will run
           continuously.

       -e name, --interface name (Set the network interface to be used) .
           This option tells Nping what interface should be used to send and receive packets.
           Nping should be able to detect this automatically, but it will tell you if it cannot.
           name must be the name of an existing network interface with an assigned IP address.

       --privileged (Assume that the user is fully privileged) .
           Tells Nping to simply assume that it is privileged enough to perform raw socket sends,
           packet sniffing, and similar operations that usually require special privileges. By
           default Nping quits if such operations are requested by a user that has no root or
           administrator privileges. This option may be useful on Linux, BSD or similar systems
           that can be configured to allow unprivileged users to perform raw-packet
           transmissions. The NPING_PRIVILEGED.  environment variable may be set as an
           alternative to using --privileged.

       --unprivileged (Assume that the user lacks raw socket privileges) .
           This option is the opposite of --privileged. It tells Nping to treat the user as
           lacking network raw socket and sniffing privileges. This is useful for testing,
           debugging, or when the raw network functionality of your operating system is somehow
           broken. The NPING_UNPRIVILEGED.  environment variable may be set as an alternative to
           using --unprivileged.

       --send-eth (Use raw ethernet sending) .
           Asks Nping to send packets at the raw ethernet (data link) layer rather than the
           higher IP (network) layer. By default, Nping chooses the one which is generally best
           for the platform it is running on. Raw sockets (IP layer) are generally most efficient
           for Unix machines, while ethernet frames are required for Windows operation since
           Microsoft disabled raw socket support. Nping still uses raw IP packets despite this
           option when there is no other choice (such as non-ethernet connections).

       --send-ip (Send at raw IP level) .
           Asks Nping to send packets via raw IP sockets rather than sending lower level ethernet
           frames. It is the complement to the --send-eth option.

       --bpf-filter filter spec --filter filter spec (Set custom BPF filter) .
           This option lets you use a custom BPF filter. By default Nping chooses a filter that
           is intended to capture most common responses to the particular probes that are sent.
           For example, when sending TCP packets, the filter is set to capture packets whose
           destination port matches the probe's source port or ICMP error messages that may be
           generated by the target or any intermediate device as a result of the probe. If for
           some reason you expect strange packets in response to sent probes or you just want to
           sniff a particular kind of traffic, you can specify a custom filter using the BPF
           syntax used by tools like tcpdump..  See the documentation at http://www.tcpdump.org/
           for more information.

       -H, --hide-sent (Do not display sent packets) .
           This option tells Nping not to print information about sent packets. This can be
           useful when using very short inter-probe delays (i.e., when flooding), because
           printing information to the standard output has a computational cost and disabling it
           can probably speed things up a bit. Also, it may be useful when using Nping to detect
           active hosts or open ports (e.g. sending probes to all TCP ports in a /24 subnet). In
           that case, users may not want to see thousands of sent probes but just the replies
           generated by active hosts.

       -N, --no-capture (Do not attempt to capture replies) .
           This option tells Nping to skip packet capture. This means that packets in response to
           sent probes will not be processed or displayed. This can be useful when doing flooding
           and network stack stress tests. Note that when this option is specified, most of the
           statistics shown at the end of the execution will be useless. This option does not
           work with TCP Connect mode.

OUTPUT OPTIONS

       -v[level], --verbose [level] (Increase or set verbosity level) .
           Increases the verbosity level, causing Nping to print more information during its
           execution. There are 9 levels of verbosity (-4 to 4). Every instance of -v increments
           the verbosity level by one (from its default value, level 0). Every instance of option
           -q decrements the verbosity level by one. Alternatively you can specify the level
           directly, as in -v3 or -v-1. These are the available levels:

           Level -4
               No output at all. In some circumstances you may not want Nping to produce any
               output (like when one of your work mates is watching over your shoulder). In that
               case level -4 can be useful because although you won't see any response packets,
               probes will still be sent.

           Level -3
               Like level -4 but displays fatal error messages so you can actually see if Nping
               is running or it failed due to some error.

           Level -2
               Like level -3 but also displays warnings and recoverable errors.

           Level -1
               Displays traditional run-time information (version, start time, statistics, etc.)
               but does not display sent or received packets.

           Level 0
               This is the default verbosity level. It behaves like level -1 but also displays
               sent and received packets and some other important information.

           Level 1
               Like level 0 but it displays detailed information about timing, flags, protocol
               details, etc.

           Level 2
               Like level 1 but displays very detailed information about sent and received
               packets and other interesting information.

           Level 3
               Like level 2 but also displays the raw hexadecimal dump of sent and received
               packets.

           Level 4 and higher
               Same as level 3.

       -q[level], --reduce-verbosity [level] (Decrease verbosity level) .
           Decreases the verbosity level, causing Nping to print less information during its
           execution.

       -d[level] (Increase or set debugging level) .
           When even verbose mode doesn't provide sufficient data for you, debugging is available
           to flood you with much more! As with the -v, debugging is enabled with a command-line
           flag -d and the debug level can be increased by specifying it multiple times. There
           are 7 debugging levels (0 to 6). Every instance of -d increments debugging level by
           one. Provide an argument to -d to set the level directly; for example -d4.

           Debugging output is useful when you suspect a bug in Nping, or if you are simply
           confused as to what Nping is doing and why. As this feature is mostly intended for
           developers, debug lines aren't always self-explanatory. You may get something like

               NSOCK (1.0000s) Callback: TIMER SUCCESS for EID 12; tcpconnect_event_handler(): Received callback of type TIMER with status SUCCESS

           If you don't understand a line, your only recourses are to ignore it, look it up in
           the source code, or request help from the development list (nmap-dev). Some lines are
           self-explanatory, but the messages become more obscure as the debug level is
           increased. These are the available levels:

           Level 0
               Level 0. No debug information at all. This is the default level.

           Level 1
               In this level, only very important or high-level debug information will be
               printed.

           Level 2
               Like level 1 but also displays important or medium-level debug information

           Level 3
               Like level 2 but also displays regular and low-level debug information.

           Level 4
               Like level 3 but also displays messages only a real Nping freak would want to see.

           Level 5
               Like level 4 but it enables basic debug information related to external libraries
               like Nsock..

           Level 6
               Like level 5 but it enables full, very detailed, debug information related to
               external libraries like Nsock.

BUGS

       Like its author, Nping isn't perfect. But you can help make it better by sending bug
       reports or even writing patches. If Nping doesn't behave the way you expect, first upgrade
       to the latest Nmap version available from https://nmap.org/download.html. If the problem
       persists, do some research to determine whether it has already been discovered and
       addressed. Try searching for the error message on our search page at
       http://insecure.org/search.html or at Google. Also try browsing the nmap-dev archives at
       http://seclists.org/.  Read this full manual page as well. If nothing comes out of this,
       mail a bug report to <dev@nmap.org>. Please include everything you have learned about the
       problem, as well as what version of Nping you are running and what operating system
       version it is running on. Problem reports and Nping usage questions sent to <dev@nmap.org>
       are far more likely to be answered than those sent to Fyodor directly. If you subscribe to
       the nmap-dev list before posting, your message will bypass moderation and get through more
       quickly. Subscribe at https://nmap.org/mailman/listinfo/dev.

       Code patches to fix bugs are even better than bug reports. Basic instructions for creating
       patch files with your changes are available at https://svn.nmap.org/nmap/HACKING. Patches
       may be sent to nmap-dev (recommended) or to any of the authors listed in the next section
       directly.

AUTHORS

       Luis MartinGarcia <luis.mgarc@gmail.com> (http://www.luismg.com)

       Fyodor <fyodor@nmap.org> (http://insecure.org)

NOTES

        1. official type numbers assigned by IANA
           http://www.iana.org/assignments/icmp-parameters

        2. official numbers assigned by IANA
           http://www.iana.org/assignments/arp-parameters/

        3. official numbers listed by the IEEE
           http://standards.ieee.org/regauth/ethertype/eth.txt