Provided by: netsniff-ng_0.6.8-3build2_amd64 
NAME
mausezahn - a fast versatile packet generator with Cisco-cli
SYNOPSIS
mausezahn { [options] "<arg-string> | <hex-string>" }
DESCRIPTION
mausezahn is a fast traffic generator which allows you to send nearly every possible and impossible
packet. In contrast to trafgen(8), mausezahn's packet configuration is on a protocol-level instead of
byte-level and mausezahn also comes with a built-in Cisco-like command-line interface, making it suitable
as a network traffic generator box in your network lab.
Next to network labs, it can also be used as a didactical tool and for security audits including
penetration and DoS testing. As a traffic generator, mausezahn is also able to test IP multicast or VoIP
networks. Packet rates close to the physical limit are reachable, depending on the hardware platform.
mausezahn supports two modes, ''direct mode'' and a multi-threaded ''interactive mode''.
The ''direct mode'' allows you to create a packet directly on the command line and every packet parameter
is specified in the argument list when calling mausezahn.
The ''interactive mode'' is an advanced multi-threaded configuration mode with its own command line
interface (CLI). This mode allows you to create an arbitrary number of packet types and streams in
parallel, each with different parameters.
The interactive mode utilizes a completely redesigned and more flexible protocol framework called
''mops'' (mausezahn's own packet system). The look and feel of the CLI is very close to the Cisco IOS^tm
command line interface.
You can start the interactive mode by executing mausezahn with the ''-x'' argument (an optional port
number may follow, otherwise it is 25542). Then use telnet(1) to connect to this mausezahn instance. If
not otherwise specified, the default login and password combination is mz:mz and the enable password is:
mops. This can be changed in /etc/netsniff-ng/mausezahn.conf.
The direct mode supports two specification schemes: The ''raw-layer-2'' scheme, where every single byte
to be sent can be specified, and ''higher-layer'' scheme, where packet builder interfaces are used (using
the ''-t'' option).
To use the ''raw-layer-2'' scheme, simply specify the desired frame as a hexadecimal sequence (the ''hex-
string''), such as:
mausezahn eth0 "00:ab:cd:ef:00 00:00:00:00:00:01 08:00 ca:fe:ba:be"
In this example, whitespaces within the byte string are optional and separate the Ethernet fields
(destination and source address, type field, and a short payload). The only additional options supported
are ''-a'', ''-b'', ''-c'', and ''-p''. The frame length must be greater than or equal to 15 bytes.
The ''higher-layer'' scheme is enabled using the ''-t <packet-type>'' option. This option activates a
packet builder, and besides the ''packet-type'', an optional ''arg-string'' can be specified. The ''arg-
string'' contains packet- specific parameters, such as TCP flags, port numbers, etc. (see example
section).
OPTIONS
mausezahn provides a built-in context-specific help. Append the keyword
''help'' after the configuration options. The most important options are:
-x [<port>]
Start mausezahn in interactive mode with a Cisco-like CLI. Use telnet to log into the local mausezahn
instance. If no port has been specified, port 25542 is used by default.
-6
Specify IPv6 mode (IPv4 is the default).
-l <IP>
Specify the IP address mausezahn should bind to when in interactive mode, default: 0.0.0.0.
-R <PRIO>
Set priority of sent packets. This configures SO_PRIORITY at the socket through which the packets are
sent. Usual priority numbers are 0..15, but the value can also be a class ID for purposes of Qdisc
classification. In that case, a class ID such is 1234:5678 would be specified as 0x12345678.
-v
Verbose mode. Capital -V is even more verbose.
-S
Simulation mode, i.e. don't put anything on the wire. This is typically combined with the verbose mode.
-q
Quiet mode where only warnings and errors are displayed.
-c <count>
Send the packet count times (default: 1, infinite: 0).
-d <delay>
Apply delay between transmissions. The delay value can be specified in usec (default, no additional unit
needed), or in msec (e.g. 100m or 100msec), or in seconds (e.g. 100s or 100sec). Note: mops also supports
nanosecond delay resolution if you need it (see interactive mode).
-r
Multiply the specified delay with a random value.
-p <length>
Pad the raw frame to specified length using zero bytes. Note that for raw layer 2 frames the specified
length defines the whole frame length, while for higher layer packets the number of additional padding
bytes are specified.
-a <src-mac|keyword>
Use specified source MAC address with hexadecimal notation such as 00:00:aa:bb:cc:dd. By default the
interface MAC address will be used. The keywords ''rand'' and ''own'' refer to a random MAC address (only
unicast addresses are created) and the own address, respectively. You can also use the keywords mentioned
below although broadcast-type source addresses are officially invalid.
-b <dst-mac|keyword>
Use specified destination MAC address. By default, a broadcast is sent in raw layer 2 mode or to the
destination hosts or gateway interface MAC address in normal (IP) mode. You can use the same keywords as
mentioned above, as well as ''bc'' or ''bcast'', ''cisco'', and ''stp''.
-A <src-ip|range|rand>
Use specified source IP address, default is own interface address. Optionally, the keyword ''rand'' can
again be used for a random source IP address or a range can be specified, such as
''192.168.1.1-192.168.1.100'' or ''10.1.0.0/16''. Also, a DNS name can be specified for which mausezahn
tries to determine the corresponding IP address automatically.
-B <dst-ip|range>
Use specified destination IP address (default is broadcast i.e. 255.255.255.255). As with the source
address (see above) you can also specify a range or a DNS name.
-t <packet-type [help] | help>
Create the specified packet type using the built-in packet builder. Currently, supported packet types
are: ''arp'', ''bpdu'', ''ip'', ''udp'', ''tcp'', ''rtp'', and ''dns''. Currently, there is also limited
support for ''icmp''. Type
''-t help'' to verify which packet builders your actual mausezahn version supports. Also, for any
particular packet type, for example ''tcp'' type
''mausezahn -t tcp help'' to receive a more in-depth context specific help.
-T <packet-type>
Make this mausezahn instance the receiving station. Currently, only ''rtp'' is an option here and
provides precise jitter measurements. For this purpose, start another mausezahn instance on the sending
station and the local receiving station will output jitter statistics. See ''mausezahn -T rtp help'' for
a detailed help.
-Q <[CoS:]vlan> [, <[CoS:]vlan>, ...]
Specify 802.1Q VLAN tag and optional Class of Service. An arbitrary number of VLAN tags can be specified
(that is, you can simulate QinQ or even QinQinQinQ..). Multiple tags must be separated via a comma or a
period (e.g. "5:10,20,2:30"). VLAN tags are not supported for ARP and BPDU packets (in which case you
could specify the whole frame in hexadecimal using the raw layer 2 interface of mausezahn).
-M <label[:cos[:ttl]][bos]> [, <label...>]
Specify a MPLS label or even a MPLS label stack. Optionally, for each label the experimental bits
(usually the Class of Service, CoS) and the Time To Live (TTL) can be specified. If you are really crazy
you can set and unset the Bottom of Stack (BoS) bit for each label using the ''S'' (set) and ''s''
(unset) option. By default, the BoS is set automatically and correctly. Any other setting will lead to
invalid frames. Enter ''-M help'' for detailed instructions and examples.
-P <ascii-payload>
Specify a cleartext payload. Alternatively, each packet type supports a hexadecimal specification of the
payload (see for example ''-t udp help'').
-f <filename>
Read the ASCII payload from the specified file.
-F <filename>
Read the hexadecimal payload from the specified file. Actually, this file must be also an ASCII text
file, but must contain hexadecimal digits, e.g. "aa:bb:cc:0f:e6...". You can use also spaces as
separation characters.
USAGE EXAMPLE
For more comprehensive examples, have a look at the two following HOWTO sections.
mausezahn eth0 -c 0 -d 2s -t bpdu vlan=5
Send BPDU frames for VLAN 5 as used with Cisco's PVST+ type of STP. By default mausezahn assumes that you
want to become the root bridge.
mausezahn eth0 -c 128000 -a rand -p 64
Perform a CAM table overflow attack.
mausezahn eth0 -c 0 -Q 5,100 -t tcp flags=syn,dp=1-1023 -p 20 -A rand -B 10.100.100.0/24
Perform a SYN flood attack to another VLAN using VLAN hopping. This only works if you are connected to
the same VLAN which is configured as native VLAN on the trunk. We assume that the victim VLAN is VLAN 100
and the native VLAN is VLAN 5. Lets attack every host in VLAN 100 which use an IP prefix of
10.100.100.0/24, also try out all ports between 1 and 1023 and use a random source IP address.
mausezahn eth0 -c 0 -d 10msec -B 230.1.1.1 -t udp dp=32000,dscp=46 -P Multicast test packet
Send IP multicast packets to the multicast group 230.1.1.1 using a UDP header with destination port 32000
and set the IP DSCP field to EF (46). Send one frame every 10 msec.
mausezahn eth0 -Q 6:420 -M 100,200,300:5 -A 172.30.0.0/16 -B target.anynetwork.foo -t udp sp=666,dp=1-65535
-p 1000 -c 10
Send UDP packets to the destination host target.anynetwork.foo using all possible destination ports and
send every packet with all possible source addresses of the range 172.30.0.0/16; additionally use a
source port of 666 and three MPLS labels, 100, 200, and 300, the outer (300) with QoS field 5. Send the
frame with a VLAN tag 420 and CoS 6; eventually pad with 1000 bytes and repeat the whole thing 10 times.
mausezahn -t syslog sev=3 -P Main reactor reached critical temperature. -A 192.168.33.42 -B 10.1.1.9 -c 6 -d
10s
Send six forged syslog messages with severity 3 to a Syslog server 10.1.1.9; use a forged source IP
address 192.168.33.42 and let mausezahn decide which local interface to use. Use an inter-packet delay of
10 seconds.
mausezahn -t tcp flags=syn|urg|rst, sp=145, dp=145, win=0, s=0-4294967295, ds=1500, urg=666 -a bcast -b bcast
-A bcast -B 10.1.1.6 -p 5
Send an invalid TCP packet with only a 5 byte payload as layer-2 broadcast and also use the broadcast MAC
address as source address. The target should be 10.1.1.6 but use a broadcast source address. The source
and destination port shall be 145 and the window size 0. Set the TCP flags SYN, URG, and RST
simultaneously and sweep through the whole TCP sequence number space with an increment of 1500. Finally
set the urgent pointer to 666, i.e. pointing to nowhere.
CONFIGURATION FILE
When mausezahn is run in interactive mode it automatically looks for and reads a configuration file
located at /etc/netsniff-ng/mausezahn.conf for custom options if the file is available, otherwise it uses
defaults set at compile time.
Config file: /etc/netsniff-ng/mausezahn.conf
The configuration file contains lines of the form:
option = value
Options supported in the configuration file are:
Option: Description:
user Username for authentication (default: mz)
password Password for authentication (default: mz)
enable Password to enter privilege mode (default: mops)
port The listening port for the CLI (default: 25542)
listen-addr IP address to bind CLI to (default: 0.0.0.0)
management-only Set management interface (no data traffic is allowed to pass through)
cli-device Interface to bind CLI to (default: all) *not fully implemented*
automops Path to automops file (contains XML data describing protocols) *in development*
Example:
$ cat /etc/netsniff-ng/mausezahn.conf
user = mzadmin
password = mzpasswd
enable = privilege-mode-passwd
port = 65000
listen-addr = 127.0.0.1
INTERACTIVE MODE HOWTO
Telnet:
Using the interactive mode requires starting mausezahn as a server:
# mausezahn -x
Now you can telnet(1) to that server using the default port number 25542, but also an arbitrary port
number can be specified:
# mausezahn -x 99
mausezahn accepts incoming telnet connections on port 99.
mz: Problems opening config file. Will use defaults
Either from another terminal or from another host try to telnet to the mausezahn server:
caprica$ telnet galactica 99
Trying 192.168.0.4...
Connected to galactica.
Escape character is '^]'.
mausezahn <version>
Username: mz
Password: mz
mz> enable
Password: mops
mz#
It is recommended to configure your own login credentials in /etc/netsniff-ng/mausezahn.conf, (see
configuration file section)
Basics:
Since you reached the mausezahn prompt, lets try some common commands. You can use the '?' character at
any time for context-specific help. Note that Cisco-like short form of commands are accepted in
interactive mode. For example, one can use "sh pac" instead of "show packet"; another common example is
to use "config t" in place of "configure terminal". For readability, this manual will continue with the
full commands.
First try out the show command:
mz# show ?
mausezahn maintains its own ARP table and observes anomalies. There is an entry for every physical
interface (however this host has only one):
mz# show arp
Intf Index IP address MAC address last Ch UCast BCast Info
----------------------------------------------------------------------------------
eth0 [1] D 192.168.0.1 00:09:5b:9a:15:84 23:44:41 1 1 0 0000
The column Ch tells us that the announced MAC address has only changed one time (= when it was learned).
The columns Ucast and BCast tell us how often this entry was announced via unicast or broadcast
respectively.
Let's check our interfaces:
mz# show interface
Available network interfaces:
real real used (fake) used (fake)
device IPv4 address MAC address IPv4 address MAC address
---------------------------------------------------------------------------------------
> eth0 192.168.0.4 00:30:05:76:2e:8d 192.168.0.4 00:30:05:76:2e:8d
lo 127.0.0.1 00:00:00:00:00:00 127.0.0.1 00:00:00:00:00:00
2 interfaces found.
Default interface is eth0.
Defining packets:
Let's check the current packet list:
mz# show packet
Packet layer flags: E=Ethernet, S=SNAP, Q=802.1Q, M=MPLS, I/i=IP/delivery_off, U=UDP, T=TCP
PktID PktName Layers Proto Size State Device Delay Count/CntX
1 sysARP_servic... E----- ARP 60 config lo 100 msec 1/0 (100%)
1 packets defined, 0 active.
We notice that there is already one system-defined packet process; it has been created and used only once
(during startup) by mausezahn's ARP service. Currently, its state is config which means that the process
is sleeping.
General packet options:
Now let's create our own packet process and switch into the global configuration mode:
mz# configure terminal
mz(config)# packet
Allocated new packet PKT0002 at slot 2
mz(config-pkt-2)# ?
...
name Assign a unique name
description Assign a packet description text
bind Select the network interface
count Configure the packet count value
delay Configure the inter-packet delay
interval Configure a greater interval
type Specify packet type
mac Configure packet's MAC addresses
tag Configure tags
payload Configure a payload
port Configure packet's port numbers
end End packet configuration mode
ethernet Configure frame's Ethernet, 802.2, 802.3, or SNAP settings
ip Configure packet's IP settings
udp Configure packet's UDP header parameters
tcp Configure packet's TCP header parameters
Here are a lot of options but normally you only need a few of them. When you configure lots of different
packets you might assign a reasonable name and description for them:
mz(config-pkt-2)# name Test
mz(config-pkt-2)# description This is just a test
You can, for example, change the default settings for the source and destination MAC or IP addresses
using the mac and ip commands:
mz(config-pkt-2)# ip address destination 10.1.1.0 /24
mz(config-pkt-2)# ip address source random
In the example above, we configured a range of addresses (all hosts in the network 10.1.1.0 should be
addressed). Additionally we spoof our source IP address. Of course, we can also add one or more VLAN and,
or, MPLS tag(s):
mz(config-pkt-2)# tag ?
dot1q Configure 802.1Q (and 802.1P) parameters
mpls Configure MPLS label stack
mz(config-pkt-2)# tag dot ?
Configure 802.1Q tags:
VLAN[:CoS] [VLAN[:CoS]] ... The leftmost tag is the outer tag in the frame
remove <tag-nr> | all Remove one or more tags (<tag-nr> starts with 1),
by default the first (=leftmost,outer) tag is removed,
keyword 'all' can be used instead of tag numbers.
cfi | nocfi [<tag-nr>] Set or unset the CFI-bit in any tag (by default
assuming the first tag).
mz(config-pkt-2)# tag dot 1:7 200:5
Configure count and delay:
mz(config-pkt-2)# count 1000
mz(config-pkt-2)# delay ?
delay <value> [hour | min | sec | msec | usec | nsec]
Specify the inter-packet delay in hours, minutes, seconds, milliseconds, microseconds or nanoseconds. The
default unit is milliseconds (i.e. when no unit is given).
mz(config-pkt-2)# delay 1 msec
Inter-packet delay set to 0 sec and 1000000 nsec
mz(config-pkt-2)#
Configuring protocol types:
mausezahn's interactive mode supports a growing list of protocols and only relies on the MOPS
architecture (and not on libnet as is the case with the legacy direct mode):
mz(config-pkt-2)# type
Specify a packet type from the following list:
arp
bpdu
igmp
ip
lldp
tcp
udp
mz(config-pkt-2)# type tcp
mz(config-pkt-2-tcp)#
....
seqnr Configure the TCP sequence number
acknr Configure the TCP acknowledgement number
hlen Configure the TCP header length
reserved Configure the TCP reserved field
flags Configure a combination of TCP flags at once
cwr Set or unset the TCP CWR flag
ece Set or unset the TCP ECE flag
urg Set or unset the TCP URG flag
ack set or unset the TCP ACK flag
psh set or unset the TCP PSH flag
rst set or unset the TCP RST flag
syn set or unset the TCP SYN flag
fin set or unset the TCP FIN flag
window Configure the TCP window size
checksum Configure the TCP checksum
urgent-pointer Configure the TCP urgent pointer
options Configure TCP options
end End TCP configuration mode
mz(config-pkt-2-tcp)# flags syn fin rst
Current setting is: --------------------RST-SYN-FIN
mz(config-pkt-2-tcp)# end
mz(config-pkt-2)# payload ascii This is a dummy payload for my first packet
mz(config-pkt-2)# end
Now configure another packet, for example let's assume we want an LLDP process:
mz(config)# packet
Allocated new packet PKT0003 at slot 3
mz(config-pkt-3)# type lldp
mz(config-pkt-3-lldp)# exit
mz(config)# exit
In the above example we only use the default LLDP settings and don't configure further LLDP options or
TLVs. Back in the top level of the CLI let's verify what we had done:
mz# show packet
Packet layer flags: E=Ethernet, S=SNAP, Q=802.1Q, M=MPLS, I/i=IP/delivery_off, U=UDP, T=TCP
PktID PktName Layers Proto Size State Device Delay Count/CntX
1 sysARP_servic... E----- ARP 60 config lo 100 msec 1/0 (100%)
2 Test E-Q-IT 125 config eth0 1000 usec 1000/1000 (0%)
3 PKT0003 E----- LLDP 36 config eth0 30 sec 0/0 (0%)
3 packets defined, 0 active.
The column Layers indicates which major protocols have been combined. For example the packet with packet-
id 2 ("Test") utilizes Ethernet (E), IP (I), and TCP (T). Additionally an 802.1Q tag (Q) has been
inserted. Now start one of these packet processes:
mz# start slot 3
Activate [3]
mz# show packet
Packet layer flags: E=Ethernet, S=SNAP, Q=802.1Q, M=MPLS, I/i=IP/delivery_off, U=UDP, T=TCP
PktID PktName Layers Proto Size State Device Delay Count/CntX
1 sysARP_servic... E----- ARP 60 config lo 100 msec 1/0 (100%)
2 Test E-Q-IT 125 config eth0 1000 usec 1000/1000 (0%)
3 PKT0003 E----- LLDP 36 config eth0 30 sec 0/1 (0%)
3 packets defined, 1 active.
Let's have a more detailed look at a specific packet process:
mz# show packet 2
Packet [2] Test
Description: This is just a test
State: config, Count=1000, delay=1000 usec (0 s 1000000 nsec), interval= (undefined)
Headers:
Ethernet: 00-30-05-76-2e-8d => ff-ff-ff-ff-ff-ff [0800 after 802.1Q tag]
Auto-delivery is ON (that is, the actual MAC is adapted upon transmission)
802.1Q: 0 tag(s); (VLAN:CoS)
IP: SA=192.168.0.4 (not random) (no range)
DA=255.255.255.255 (no range)
ToS=0x00 proto=17 TTL=255 ID=0 offset=0 flags: -|-|-
len=49664(correct) checksum=0x2e8d(correct)
TCP: 83 bytes segment size (including TCP header)
SP=0 (norange) (not random), DP=0 (norange) (not random)
SQNR=3405691582 (start 0, stop 4294967295, delta 0) -- ACKNR=0 (invalid)
Flags: ------------------------SYN----, reserved field is 00, urgent pointer= 0
Announced window size= 100
Offset= 0 (times 32 bit; value is valid), checksum= ffff (valid)
(No TCP options attached) - 0 bytes defined
Payload size: 43 bytes
Frame size: 125 bytes
1 ff:ff:ff:ff:ff:ff:00:30 05:76:2e:8d:81:00:e0:01 81:00:a0:c8:08:00:45:00 00:67:00:00:00:00:ff:06
33 fa:e4:c0:a8:00:04:ff:ff ff:ff:00:00:00:00:ca:fe ba:be:00:00:00:00:a0:07 00:64:f7:ab:00:00:02:04
65 05:ac:04:02:08:0a:19:35 90:c3:00:00:00:00:01:03 03:05:54:68:69:73:20:69 73:20:61:20:64:75:6d:6d
97 79:20:70:61:79:6c:6f:61 64:20:66:6f:72:20:6d:79 20:66:69:72:73:74:20:70 61:63:6b:65:74
mz#
If you want to stop one or more packet processes, use the stop command. The "emergency stop" is when you
use stop all:
mz# stop all
Stopping
[3] PKT0003
Stopped 1 transmission processe(s)
The launch command provides a shortcut for commonly used packet processes. For example to behave like a
STP-capable bridge we want to start an BPDU process with typical parameters:
mz# launch bpdu
Allocated new packet sysBPDU at slot 5
mz# show packet
Packet layer flags: E=Ethernet, S=SNAP, Q=802.1Q, M=MPLS, I/i=IP/delivery_off, U=UDP, T=TCP
PktID PktName Layers Proto Size State Device Delay Count/CntX
1 sysARP_servic... E----- ARP 60 config lo 100 msec 1/0 (100%)
2 Test E-Q-IT 125 config eth0 1000 usec 1000/1000 (0%)
3 PKT0003 E----- LLDP 36 config eth0 30 sec 0/12 (0%)
4 PKT0004 E---I- IGMP 46 config eth0 100 msec 0/0 (0%)
5 sysBPDU ES---- BPDU 29 active eth0 2 sec 0/1 (0%)
5 packets defined, 1 active.
Now a Configuration BPDU is sent every 2 seconds, claiming to be the root bridge (and usually confusing
the LAN. Note that only packet 5 (i.e. the last row) is active and therefore sending packets while all
other packets are in state config (i.e. they have been configured but they are not doing anything at the
moment).
Configuring a greater interval:
Sometimes you may want to send a burst of packets at a greater interval:
mz(config)# packet 2
Modify packet parameters for packet Test [2]
mz(config-pkt-2)# interval
Configure a greater packet interval in days, hours, minutes, or seconds
Arguments: <value> <days | hours | minutes | seconds>
Use a zero value to disable an interval.
mz(config-pkt-2)# interval 1 hour
mz(config-pkt-2)# count 10
mz(config-pkt-2)# delay 15 usec
Inter-packet delay set to 0 sec and 15000 nsec
Now this packet is sent ten times with an inter-packet delay of 15 microseconds and this is repeated
every hour. When you look at the packet list, an interval is indicated with the additional flag 'i' when
inactive or 'I' when active:
mz# show packet
Packet layer flags: E=Ethernet, S=SNAP, Q=802.1Q, M=MPLS, I/i=IP/delivery_off, U=UDP, T=TCP
PktID PktName Layers Proto Size State Device Delay Count/CntX
1 sysARP_servic... E----- ARP 60 config lo 100 msec 1/0 (100%)
2 Test E-Q-IT 125 config-i eth0 15 usec 10/10 (0%)
3 PKT0003 E----- LLDP 36 config eth0 30 sec 0/12 (0%)
4 PKT0004 E---I- IGMP 46 config eth0 100 msec 0/0 (0%)
5 sysBPDU ES---- BPDU 29 active eth0 2 sec 0/251 (0%)
5 packets defined, 1 active.
mz# start slot 2
Activate [2]
mz# show packet
Packet layer flags: E=Ethernet, S=SNAP, Q=802.1Q, M=MPLS, I/i=IP/delivery_off, U=UDP, T=TCP
PktID PktName Layers Proto Size State Device Delay Count/CntX
1 sysARP_servic... E----- ARP 60 config lo 100 msec 1/0 (100%)
2 Test E-Q-IT 125 config+I eth0 15 usec 10/0 (100%)
3 PKT0003 E----- LLDP 36 config eth0 30 sec 0/12 (0%)
4 PKT0004 E---I- IGMP 46 config eth0 100 msec 0/0 (0%)
5 sysBPDU ES---- BPDU 29 active eth0 2 sec 0/256 (0%)
5 packets defined, 1 active.
Note that the flag 'I' indicates that an interval has been specified for packet 2. The process is not
active at the moment (only packet 5 is active here) but it will become active at a regular interval. You
can verify the actual interval when viewing the packet details via the 'show packet 2' command.
Load prepared configurations:
You can prepare packet configurations using the same commands as you would type them in on the CLI and
then load them to the CLI. For example, assume we have prepared a file 'test.mops' containing:
configure terminal
packet
name IGMP_TEST
desc This is only a demonstration how to load a file to mops
type igmp
Then we can add this packet configuration to our packet list using the load command:
mz# load test.mops
Read commands from test.mops...
Allocated new packet PKT0002 at slot 2
mz# show packet
Packet layer flags: E=Ethernet, S=SNAP, Q=802.1Q, M=MPLS, I/i=IP/delivery_off, U=UDP, T=TCP
PktID PktName Layers Proto Size State Device Delay Count/CntX
1 sysARP_servic... E----- ARP 60 config lo 100 msec 1/0 (100%)
2 IGMP_TEST E---I- IGMP 46 config eth0 100 msec 0/0 (0%)
2 packets defined, 0 active.
The file src/examples/mausezahn/example_lldp.conf contains another example list of commands to create a
bogus LLDP packet. You can load this configuration from the mausezahn command line as follows:
mz# load /home/hh/tmp/example_lldp.conf
In case you copied the file in that path. Now when you enter 'show packet' you will see a new packet
entry in the packet list. Use the 'start slot <nr>' command to activate this packet.
You can store your own packet creations in such a file and easily load them when you need them. Every
command within such configuration files is executed on the command line interface as if you had typed it
in -- so be careful about the order and don't forget to use 'configure terminal' as first command.
You can even load other files from within a central config file.
DIRECT MODE HOWTO
How to specify hexadecimal digits:
Many arguments allow direct byte input. Bytes are represented as two hexadecimal digits. Multiple bytes
must be separated either by spaces, colons, or dashes - whichever you prefer. The following byte strings
are equivalent:
"aa:bb cc-dd-ee ff 01 02 03-04 05"
"aa bb cc dd ee ff:01:02:03:04 05"
To begin with, you may want to send an arbitrary fancy (possibly invalid) frame right through your
network card:
mausezahn ff:ff:ff:ff:ff:ff:ff:ff:ff:ff:ff:ff:08:00:ca:fe:ba:be
or equivalent but more readable:
mausezahn ff:ff:ff:ff:ff:ff-ff:ff:ff:ff:ff:ff-08:00-ca:fe:ba:be
Basic operations:
All major command line options are listed when you execute mausezahn without arguments. For practical
usage, keep the following special (not so widely known) options in mind:
-r Multiplies the specified delay with a random value.
-p <length> Pad the raw frame to specified length (using random bytes).
-P <ASCII Payload> Use the specified ASCII payload.
-f <filename> Read the ASCII payload from a file.
-F <filename> Read the hexadecimal payload from a file.
-S Simulation mode: DOES NOT put anything on the wire.
This is typically combined with one of the verbose
modes (-v or V).
Many options require a keyword or a number but the -t option is an exception since it requires both a
packet type (such as ip, udp, dns, etc) and an argument string which is specific for that packet type.
Here are some simple examples:
mausezahn -t help
mausezahn -t tcp help
mausezahn eth3 -t udp sp=69,dp=69,p=ca:fe:ba:be
Note: Don't forget that on the CLI the Linux shell (usually the Bash) interprets spaces as a delimiting
character. That is, if you are specifying an argument that consists of multiple words with spaces in
between, you MUST group these within quotes. For example, instead of
mausezahn eth0 -t udp sp=1,dp=80,p=00:11:22:33
you could either omit the spaces
mausezahn eth0 -t udp sp=1,dp=80,p=00:11:22:33
or, for greater safety, use quotes:
mausezahn eth0 -t udp "sp=1,dp=80,p=00:11:22:33"
In order to monitor what's going on, you can enable the verbose mode using the -v option. The opposite is
the quiet mode (-q) which will keep mausezahn absolutely quiet (except for error messages and warnings.)
Don't confuse the payload argument p=... with the padding option -p. The latter is used outside the
quotes!
The automatic packet builder:
An important argument is -t which invokes a packet builder. Currently there are packet builders for ARP,
BPDU, CDP, IP, partly ICMP, UDP, TCP, RTP, DNS, and SYSLOG. (Additionally you can insert a VLAN tag or a
MPLS label stack but this works independently of the packet builder.)
You get context specific help for every packet builder using the help keyword, such as:
mausezahn -t bpdu help
mausezahn -t tcp help
For every packet you may specify an optional payload. This can be done either via hexadecimal notation
using the payload (or short p) argument or directly as ASCII text using the -P option:
mausezahn eth0 -t ip -P "Hello World" # ASCII payload
mausezahn eth0 -t ip p=68:65:6c:6c:6f:20:77:6f:72:6c:64 # hex payload
mausezahn eth0 -t ip "proto=89, \
p=68:65:6c:6c:6f:20:77:6f:72:6c:64, \ # same with other
ttl=1" # IP arguments
Note: The raw link access mode only accepts hexadecimal payloads (because you specify everything in
hexadecimal here.)
Packet count and delay:
By default only one packet is sent. If you want to send more packets then use the count option -c
<count>. When count is zero then mausezahn will send forever. By default, mausezahn sends at maximum
speed (and this is really fast ;-)). If you don't want to overwhelm your network devices or have other
reasons to send at a slower rate then you might want to specify a delay using the -d <delay> option.
If you only specify a numeric value it is interpreted in microsecond units. Alternatively, for easier
use, you might specify units such as seconds, sec, milliseconds, or msec. (You can also abbreviate this
with s or m.) Note: Don't use spaces between the value and the unit! Here are typical examples:
Send an infinite number of frames as fast as possible:
mausezahn -c 0 "aa bb cc dd ...."
Send 100,000 frames with a 50 msec interval:
mausezahn -c 100000 -d 50msec "aa bb cc dd ...."
Send an unlimited number of BPDU frames in a 2 second interval:
mausezahn -c 0 -d 2s -t bpdu conf
Note: mausezahn does not support fractional numbers. If you want to specify for example 2.5 seconds then
express this in milliseconds (2500 msec).
Source and destination addresses:
As a mnemonic trick keep in mind that all packets run from "A" to "B". You can always specify source and
destination MAC addresses using the -a and -b options, respectively. These options also allow keywords
such as rand, own, bpdu, cisco, and others.
Similarly, you can specify source and destination IP addresses using the -A and -B options, respectively.
These options also support FQDNs (i.e. domain names) and ranges such as 192.168.0.0/24 or
10.0.0.11-10.0.3.22. Additionally, the source address option supports the rand keyword (ideal for
"attacks").
Note: When you use the packet builder for IP-based packets (e.g. UDP or TCP) then mausezahn automatically
cares about correct MAC and IP addresses (i.e. it performs ARP, DHCP, and DNS for you). But when you
specify at least a single link-layer address (or any other L2 option such as a VLAN tag or MPLS header)
then ARP is disabled and you must care for the Ethernet destination address for yourself.
Layer-2:
`-- Direct link access:
mausezahn allows you to send ANY chain of bytes directly through your Ethernet interface:
mausezahn eth0 "ff:ff:ff:ff:ff:ff ff:ff:ff:ff:ff:ff 00:00 ca:fe:ba:be"
This way you can craft every packet you want but you must do it by hand. Note: On Wi-Fi interfaces the
header is much more complicated and automatically created by the Wi-Fi driver. As an example to introduce
some interesting options, lets continuously send frames at max speed with random source MAC address and
broadcast destination address, additionally pad the frame to 1000 bytes:
mausezahn eth0 -c 0 -a rand -b bcast -p 1000 "08 00 aa bb cc dd"
The direct link access supports automatic padding using the -p <total frame length> option. This allows
you to pad a raw L2 frame to the desired length. You must specify the total length, and the total frame
length must have at least 15 bytes for technical reasons. Zero bytes are used for padding.
`-- ARP:
mausezahn provides a simple interface to the ARP packet. You can specify the ARP method (request|reply)
and up to four arguments: sendermac, targetmac, senderip, targetip, or short smac, tmac, sip, tip. By
default, an ARP reply is sent with your own interface addresses as source MAC and IP address, and a
broadcast destination MAC and IP address. Send a gratuitous ARP request (as used for duplicate IP address
detection):
mausezahn eth0 -t arp
ARP cache poisoning:
mausezahn eth0 -t arp "reply, senderip=192.168.0.1, targetmac=00:00:0c:01:02:03, \
targetip=172.16.1.50"
where by default your interface MAC address will be used as sendermac, senderip denotes the spoofed IP
address, targetmac and targetip identifies the receiver. By default, the Ethernet source address is your
interface MAC and the destination address is the broadcast address. You can change this using the flags
-a and -b.
`-- BPDU:
mausezahn provides a simple interface to the 802.1D BPDU frame format (used to create the Spanning Tree
in bridged networks). By default, standard IEEE 802.1D BPDUs are sent and it is assumed that your
computer wants to become the root bridge (rid=bid). Optionally the 802.3 destination address can be a
specified MAC address, broadcast, own MAC, or Cisco's PVST+ MAC address. The destination MAC can be
specified using the -b command which, besides MAC addresses, accepts keywords such as bcast, own, pvst,
or stp (default). PVST+ is supported as well. Simply specify the VLAN for which you want to send a BPDU:
mausezahn eth0 -t bpdu "vlan=123, rid=2000"
See mausezahn -t bpdu help for more details.
`-- CDP:
mausezahn can send Cisco Discovery Protocol (CDP) messages since this protocol has security relevance. Of
course lots of dirty tricks are possible; for example arbitrary TLVs can be created (using the hex-
payload argument for example p=00:0e:00:07:01:01:90) and if you want to stress the CDP database of some
device, mausezahn can send each CDP message with another system-id using the change keyword:
mausezahn -t cdp change -c 0
Some routers and switches may run into deep problems ;-) See mausezahn -t cdp help for more details.
`-- 802.1Q VLAN Tags:
mausezahn allows simple VLAN tagging for IP (and other higher layer) packets. Simply use the option -Q
<[CoS:]VLAN>, such as -Q 10 or -Q 3:921. By default CoS=0. For example send a TCP packet in VLAN 500
using CoS=7:
mausezahn eth0 -t tcp -Q 7:500 "dp=80, flags=rst, p=aa:aa:aa"
You can create as many VLAN tags as you want! This is interesting to create QinQ encapsulations or VLAN
hopping: Send a UDP packet with VLAN tags 100 (outer) and 651 (inner):
mausezahn eth0 -t udp "dp=8888, sp=13442" -P "Mausezahn is great" -Q 100,651
Don't know if this is useful anywhere but at least it is possible:
mausezahn eth0 -t udp "dp=8888, sp=13442" -P "Mausezahn is great" \
-Q 6:5,7:732,5:331,5,6
Mix it with MPLS:
mausezahn eth0 -t udp "dp=8888, sp=13442" -P "Mausezahn is great" -Q 100,651 -M 314
When in raw Layer 2 mode you must create the VLAN tag completely by yourself. For example if you want to
send a frame in VLAN 5 using CoS 0 simply specify 81:00 as type field and for the next two bytes the CoS
(PCP), DEI (CFI), and VLAN ID values (all together known as TCI):
mausezahn eth0 -b bc -a rand "81:00 00:05 08:00 aa-aa-aa-aa-aa-aa-aa-aa-aa"
`-- MPLS labels:
mausezahn allows you to insert one or more MPLS headers. Simply use the option -M <label:CoS:TTL:BoS>
where only the label is mandatory. If you specify a second number it is interpreted as the experimental
bits (the CoS usually). If you specify a third number it is interpreted as TTL. By default the TTL is set
to 255. The Bottom of Stack flag is set automatically, otherwise the frame would be invalid, but if you
want you can also set or unset it using the S (set) and s (unset) argument. Note that the BoS must be the
last argument in each MPLS header definition. Here are some examples:
Use MPLS label 214:
mausezahn eth0 -M 214 -t tcp "dp=80" -P "HTTP..." -B myhost.com
Use three labels (the 214 is now the outer):
mausezahn eth0 -M 9999,51,214 -t tcp "dp=80" -P "HTTP..." -B myhost.com
Use two labels, one with CoS=5 and TTL=1, the other with CoS=7:
mausezahn eth0 -M 100:5:1,500:7 -t tcp "dp=80" -P "HTTP..." -B myhost.com
Unset the BoS flag (which will result in an invalid frame):
mausezahn eth0 -M 214:s -t tcp "dp=80" -P "HTTP..." -B myhost.com
Layer 3-7:
IP, UDP, and TCP packets can be padded using the -p option. Currently 0x42 is used as padding byte ('the
answer'). You cannot pad DNS packets (would be useless anyway).
`-- IP:
mausezahn allows you to send any malformed or correct IP packet. Every field in the IP header can be
manipulated. The IP addresses can be specified via the -A and -B options, denoting the source and
destination address, respectively. You can also specify an address range or a host name (FQDN).
Additionally, the source address can also be random. By default the source address is your interface IP
address and the destination address is a broadcast address. Here are some examples:
ASCII payload:
mausezahn eth0 -t ip -A rand -B 192.168.1.0/24 -P "hello world"
Hexadecimal payload:
mausezahn eth0 -t ip -A 10.1.0.1-10.1.255.254 -B 255.255.255.255 p=ca:fe:ba:be
Will use correct source IP address:
mausezahn eth0 -t ip -B www.xyz.com
The Type of Service (ToS) byte can either be specified directly by two hexadecimal digits, which means
you can also easily set the Explicit Congestion Notification (ECN) bits (LSB 1 and 2), or you may only
want to specify a common DSCP value (bits 3-8) using a decimal number (0..63):
Packet sent with DSCP = Expedited Forwarding (EF):
mausezahn eth0 -t ip dscp=46,ttl=1,proto=1,p=08:00:5a:a2:de:ad:be:af
If you leave the checksum as zero (or unspecified) the correct checksum will be automatically computed.
Note that you can only use a wrong checksum when you also specify at least one L2 field manually.
`-- UDP:
mausezahn supports easy UDP datagram generation. Simply specify the destination address (-B option) and
optionally an arbitrary source address (-A option) and as arguments you may specify the port numbers
using the dp (destination port) and sp (source port) arguments and a payload. You can also easily specify
a whole port range which will result in sending multiple packets. Here are some examples:
Send test packets to the RTP port range:
mausezahn eth0 -B 192.168.1.1 -t udp "dp=16384-32767, \
p=A1:00:CC:00:00:AB:CD:EE:EE:DD:DD:00"
Send a DNS request as local broadcast (often a local router replies):
mausezahn eth0 -t udp dp=53,p=c5-2f-01-00-00-01-00-00-00-00-00-00-03-77-77-\
77-03-78-79-7a-03-63-6f-6d-00-00-01-00-01"
Additionally you may specify the length and checksum using the len and sum arguments (will be set
correctly by default). Note: several protocols have same arguments such as len (length) and sum
(checksum). If you specified a UDP type packet (via -t udp) and want to modify the IP length, then use
the alternate keyword iplen and ipsum. Also note that you must specify at least one L2 field which tells
mausezahn to build everything without the help of your kernel (the kernel would not allow modifying the
IP checksum and the IP length).
`-- ICMP:
mausezahn currently only supports the following ICMP methods: PING (echo request), Redirect (various
types), Unreachable (various types). Additional ICMP types will be supported in future. Currently you
would need to tailor them by yourself, e.g. using the IP packet builder (setting proto=1). Use the
mausezahn -t icmp help for help on currently implemented options.
`-- TCP:
mausezahn allows you to easily tailor any TCP packet. Similarly as with UDP you can specify source and
destination port (ranges) using the sp and dp arguments. Then you can directly specify the desired flags
using an "|" as delimiter if you want to specify multiple flags. For example, a SYN-Flood attack against
host 1.1.1.1 using a random source IP address and periodically using all 1023 well-known ports could be
created via:
mausezahn eth0 -A rand -B 1.1.1.1 -c 0 -t tcp "dp=1-1023, flags=syn" \
-P "Good morning! This is a SYN Flood Attack. \
We apologize for any inconvenience."
Be careful with such SYN floods and only use them for firewall testing. Check your legal position!
Remember that a host with an open TCP session only accepts packets with correct socket information
(addresses and ports) and a valid TCP sequence number (SQNR). If you want to try a DoS attack by sending
a RST-flood and you do NOT know the target's initial SQNR (which is normally the case) then you may want
to sweep through a range of sequence numbers:
mausezahn eth0 -A legal.host.com -B target.host.com \
-t tcp "sp=80,dp=80,s=1-4294967295"
Fortunately, the SQNR must match the target host's acknowledgement number plus the announced window size.
Since the typical window size is something between 40000 and 65535 you are MUCH quicker when using an
increment via the ds argument:
mausezahn eth0 -A legal.host.com -B target.host.com \
-t tcp "sp=80, dp=80, s=1-4294967295, ds=40000"
In the latter case mausezahn will only send 107375 packets instead of 4294967295 (which results in a
duration of approximately 1 second compared to 11 hours!). Of course you can tailor any TCP packet you
like. As with other L4 protocols mausezahn builds a correct IP header but you can additionally access
every field in the IP packet (also in the Ethernet frame).
`-- DNS:
mausezahn supports UDP-based DNS requests or responses. Typically you may want to send a query or an
answer. As usual, you can modify every flag in the header. Here is an example of a simple query:
mausezahn eth0 -B mydns-server.com -t dns "q=www.ibm.com"
You can also create server-type messages:
mausezahn eth0 -A spoofed.dns-server.com -B target.host.com \
"q=www.topsecret.com, a=172.16.1.1"
The syntax according to the online help (-t dns help) is:
query|q = <name>[:<type>] ............. where type is per default "A"
(and class is always "IN")
answer|a = [<type>:<ttl>:]<rdata> ...... ttl is per default 0.
= [<type>:<ttl>:]<rdata>/[<type>:<ttl>:]<rdata>/...
Note: If you only use the 'query' option then a query is sent. If you additionally add an 'answer' then
an answer is sent. Examples:
q = www.xyz.com
q = www.xyz.com, a=192.168.1.10
q = www.xyz.com, a=A:3600:192.168.1.10
q = www.xyz.com, a=CNAME:3600:abc.com/A:3600:192.168.1.10
Please try out mausezahn -t dns help to see the many other optional command line options.
`-- RTP and VoIP path measurements:
mausezahn can send arbitrary Real Time Protocol (RTP) packets. By default a classical G.711 codec packet
of 20 ms segment size and 160 bytes is assumed. You can measure jitter, packet loss, and reordering along
a path between two hosts running mausezahn. The jitter measurement is either done following the variance
low-pass filtered estimation specified in RFC 3550 or using an alternative "real-time" method which is
even more precise (the RFC-method is used by default). For example on Host1 you start a transmission
process:
mausezahn -t rtp -B 192.168.1.19
And on Host2 (192.168.1.19) a receiving process which performs the measurement:
mausezahn -T rtp
Note that the option flag with the capital "T" means that it is a server RTP process, waiting for
incoming RTP packets from any mausezahn source. In case you want to restrict the measurement to a
specific source or you want to perform a bidirectional measurement, you must specify a stream identifier.
Here is an example for bidirectional measurements which logs the running jitter average in a file:
Host1# mausezahn -t rtp id=11:11:11:11 -B 192.168.2.2 &
Host1# mausezahn -T rtp id=22:22:22:22 "log, path=/tmp/mz/"
Host2# mausezahn -t rtp id=22:22:22:22 -B 192.168.1.1 &
Host2# mausezahn -T rtp id=11:11:11:11 "log, path=/tmp/mz/"
In any case the measurements are printed continuously onto the screen; by default it looks like this:
0.00 0.19 0.38 0.57
|-------------------------|-------------------------|-------------------------|
######### 0.07 msec
#################### 0.14 msec
## 0.02 msec
### 0.02 msec
######### 0.07 msec
#### 0.03 msec
######### 0.07 msec
############# 0.10 msec
## 0.02 msec
########################################### 0.31 msec
######### 0.07 msec
############################################## 0.33 msec
############### 0.11 msec
########## 0.07 msec
############### 0.11 msec
########################################################## 0.42 msec
##### 0.04 msec
More information is shown using the txt keyword:
mausezahn -T rtp txt
Got 100 packets from host 192.168.0.3: 0 lost (0 absolute lost), 1 out of order
Jitter_RFC (low pass filtered) = 30 usec
Samples jitter (min/avg/max) = 1/186/2527 usec
Delta-RX (min/avg/max) = 2010/20167/24805 usec
Got 100 packets from host 192.168.0.3: 0 lost (0 absolute lost), 1 out of order
Jitter_RFC (low pass filtered) = 17 usec
Samples jitter (min/avg/max) = 1/53/192 usec
Delta-RX (min/avg/max) = 20001/20376/20574 usec
Got 100 packets from host 192.168.0.3: 0 lost (0 absolute lost), 1 out of order
Jitter_RFC (low pass filtered) = 120 usec
Samples jitter (min/avg/max) = 0/91/1683 usec
Delta-RX (min/avg/max) = 18673/20378/24822 usec
See mausezahn -t rtp help and mz -T rtp help for more details.
`-- Syslog:
The traditional Syslog protocol is widely used even in professional networks and is sometimes vulnerable.
For example you might insert forged Syslog messages by spoofing your source address (e.g. impersonate the
address of a legit network device):
mausezahn -t syslog sev=3 -P "You have been mausezahned." -A 10.1.1.109 -B 192.168.7.7
See mausezahn -t syslog help for more details.
NOTE
When multiple ranges are specified, e.g. destination port ranges and destination address ranges, then all
possible combinations of ports and addresses are used for packet generation. Furthermore, this can be
mixed with other ranges e.g. a TCP sequence number range. Note that combining ranges can lead to a very
huge number of frames to be sent. As a rule of thumb you can assume that about 100,000 frames and more
are sent in a fraction of one second, depending on your network interface.
mausezahn has been designed as a fast traffic generator so you might easily overwhelm a LAN segment with
myriads of packets. And because mausezahn could also support security audits it is possible to create
malicious or invalid packets, SYN floods, port and address sweeps, DNS and ARP poisoning, etc.
Therefore, don't use this tool when you are not aware of the possible consequences or have only a little
knowledge about networks and data communication. If you abuse mausezahn for 'unallowed' attacks and get
caught, or damage something of your own, then this is completely your fault. So the safest solution is to
try it out in a lab environment.
Also have a look at the netsniff-ng(8) note section on how you can properly setup and tune your system.
LEGAL
mausezahn is licensed under the GNU GPL version 2.0.
HISTORY
mausezahn was originally written by Herbert Haas. According to his website [1], he unfortunately passed
away in 2011 thus leaving this tool unmaintained. It has been adopted and integrated into the netsniff-
ng toolkit and is further being maintained and developed from there. Maintainers are Tobias Klauser
<tklauser@distanz.ch> and Daniel Borkmann <dborkma@tik.ee.ethz.ch>.
[1] http://www.perihel.at/
SEE ALSO
netsniff-ng(8), trafgen(8), ifpps(8), bpfc(8), flowtop(8), astraceroute(8), curvetun(8)
AUTHOR
Manpage was written by Herbert Haas and modified by Daniel Borkmann.
COLOPHON
This page is part of the Linux netsniff-ng toolkit project. A description of the project, and information
about reporting bugs, can be found at http://netsniff-ng.org/.