Provided by: mtr_0.93-1_amd64 bug

NAME

       mtr - a network diagnostic tool

SYNOPSIS

       mtr   [-4|-6]   [-F FILENAME]   [--report]   [--report-wide]  [--xml]  [--gtk]  [--curses]
       [--displaymode MODE]  [--raw]   [--csv]   [--json]   [--split]   [--no-dns]   [--show-ips]
       [-o FIELDS]    [-y IPINFO]    [--aslookup]    [-i INTERVAL]   [-c COUNT]   [-s PACKETSIZE]
       [-B BITPATTERN] [-G GRACEPERIOD] [-Q TOS] [--mpls] [-I NAME]  [-a ADDRESS]  [-f FIRST-TTL]
       [-m MAX-TTL]   [-U MAX-UNKNOWN]   [--udp]   [--tcp]   [--sctp]   [-P PORT]  [-L LOCALPORT]
       [-Z TIMEOUT] [-M MARK] HOSTNAME

DESCRIPTION

       mtr combines the functionality of the traceroute and ping programs  in  a  single  network
       diagnostic tool.

       As  mtr  starts,  it  investigates the network connection between the host mtr runs on and
       HOSTNAME by sending packets with purposely low TTLs.  It continues to  send  packets  with
       low  TTL,  noting  the response time of the intervening routers.  This allows mtr to print
       the response percentage and response times of the internet route to  HOSTNAME.   A  sudden
       increase  in  packet  loss  or  response  time  is often an indication of a bad (or simply
       overloaded) link.

       The results are usually reported as round-trip-response  times  in  milliseconds  and  the
       percentage of packetloss.

OPTIONS

       -h, --help
              Print the summary of command line argument options.

       -v, --version
              Print the installed version of mtr.

       -4     Use IPv4 only.

       -6     Use IPv6 only.  (IPV4 may be used for DNS lookups.)

       -F FILENAME, --filename FILENAME
              Reads the list of hostnames from the specified file.

       -r, --report
              This  option  puts  mtr  into report mode.  When in this mode, mtr will run for the
              number of cycles specified by the -c option, and then print statistics and exit.

       This mode is useful for generating statistics about network quality.
              Note that each running instance of mtr generates a significant  amount  of  network
              traffic.   Using mtr to measure the quality of your network may result in decreased
              network performance.

       -w, --report-wide
              This option puts mtr into wide report mode.  When in this mode, mtr  will  not  cut
              hostnames in the report.

       -x, --xml
              Use  this  option  to tell mtr to use the xml output format.  This format is better
              suited for automated processing of the measurement results.

       -t, --curses
              Use this option to force mtr  to  use  the  curses  based  terminal  interface  (if
              available).   In case the list of hops exceeds the height of your terminal, you can
              use the + and - keys to scroll up and down half a page.

              Ctrl-L clears spurious error  messages  that  may  overwrite  other  parts  of  the
              display.

       --displaymode MODE
              Use this option to select the initial display mode: 0 (default) selects statistics,
              1 selects the stripchart without latency information, and 2 selects the  stripchart
              with latency information.

       -g, --gtk
              Use  this  option  to  force  mtr  to  use  the GTK+ based X11 window interface (if
              available).  GTK+ must have been available on the system when  mtr  was  built  for
              this  to work.  See the GTK+ web page at ⟨http://www.gtk.org/⟩ for more information
              about GTK+.

       -l, --raw
              Use the raw output format.  This format  is  better  suited  for  archival  of  the
              measurement  results.   It  could  be  parsed to be presented into any of the other
              display methods.

              Example of the raw output format:
              h 0 10.1.1.1
              p 0 339
              h 1 46.149.16.4
              p 1 530
              h 2 172.31.1.16
              p 2 531
              h 3 82.221.168.236
              p 3 1523
              h 5 195.130.211.8
              p 5 1603
              h 6 193.4.58.17
              p 6 1127
              h 7 193.4.58.17
              d 7 www.isnic.is

       -C, --csv
              Use the  Comma-Separated-Value  (CSV)  output  format.   (Note:  The  separator  is
              actually a semi-colon ';'.)

              Example of the CSV output format:
              MTR.0.86+git:16e39fc0;1435562787;OK;nic.is;1;r-76520-PROD.greenqloud.internal;288
              MTR.0.86+git:16e39fc0;1435562787;OK;nic.is;2;46.149.16.4;2086
              MTR.0.86+git:16e39fc0;1435562787;OK;nic.is;3;172.31.1.16;600
              MTR.0.86+git:16e39fc0;1435562787;OK;nic.is;4;82.221.168.236;1163
              MTR.0.86+git:16e39fc0;1435562787;OK;nic.is;5;???;0
              MTR.0.86+git:16e39fc0;1435562787;OK;nic.is;6;rix-k2-gw.isnic.is;1654
              MTR.0.86+git:16e39fc0;1435562787;OK;nic.is;7;www.isnic.is;1036

       -j, --json
              Use  this  option to tell mtr to use the JSON output format.  This format is better
              suited for automated processing of the measurement results.

       -p, --split
              Use this option to set mtr to spit out a format that is suitable for  a  split-user
              interface.

       -n, --no-dns
              Use  this  option to force mtr to display numeric IP numbers and not try to resolve
              the host names.

       -b, --show-ips
              Use this option to tell mtr to display both the host names and numeric IP  numbers.
              In  split  mode  this  adds an extra field to the output.  In report mode, there is
              usually too little space to add the IPs, and they will be truncated.  Use the  wide
              report (-w) mode to see the IPs in report mode.

       -o FIELDS, --order FIELDS
              Use this option to specify which fields to display and in which order.  You may use
              one or more space characters to separate fields.
              Available fields:

                                           ┌──┬─────────────────────┐
                                           │L │ Loss ratio          │
                                           ├──┼─────────────────────┤
                                           │D │ Dropped packets     │
                                           ├──┼─────────────────────┤
                                           │R │ Received packets    │
                                           ├──┼─────────────────────┤
                                           │S │ Sent Packets        │
                                           ├──┼─────────────────────┤
                                           │N │ Newest RTT(ms)      │
                                           ├──┼─────────────────────┤
                                           │B │ Min/Best RTT(ms)    │
                                           ├──┼─────────────────────┤
                                           │A │ Average RTT(ms)     │
                                           ├──┼─────────────────────┤
                                           │W │ Max/Worst RTT(ms)   │
                                           ├──┼─────────────────────┤
                                           │V │ Standard Deviation  │
                                           ├──┼─────────────────────┤
                                           │G │ Geometric Mean      │
                                           ├──┼─────────────────────┤
                                           │J │ Current Jitter      │
                                           ├──┼─────────────────────┤
                                           │M │ Jitter Mean/Avg.    │
                                           ├──┼─────────────────────┤
                                           │X │ Worst Jitter        │
                                           ├──┼─────────────────────┤
                                           │I │ Interarrival Jitter │
                                           └──┴─────────────────────┘
              Example: -o "LSD NBAW  X"

       -y n, --ipinfo n
              Displays information about each IP hop.  Valid values for n are:

              0   Display AS number (equivalent to -z)
              1   Display IP prefix
              2   Display country code of the origin AS
              3   Display RIR (ripencc, arin, ...)
              4   Display the allocation date of the IP prefix

              It is possible to cycle between these fields at runtime (using the y key).

       -z, --aslookup
              Displays the Autonomous System (AS)  number  alongside  each  hop.   Equivalent  to
              --ipinfo 0.

              Example (columns to the right not shown for clarity):
              1. AS???   r-76520-PROD.greenqloud.internal
              2. AS51969 46.149.16.4
              3. AS???   172.31.1.16
              4. AS30818 82.221.168.236
              5. ???
              6. AS???   rix-k2-gw.isnic.is
              7. AS1850  www.isnic.is

       -i SECONDS, --interval SECONDS
              Use  this  option  to  specify  the  positive  number  of seconds between ICMP ECHO
              requests.  The default value for this parameter is one second.  The root  user  may
              choose values between zero and one.

       -c COUNT, --report-cycles COUNT
              Use  this  option to set the number of pings sent to determine both the machines on
              the network and the reliability of those machines.  Each cycle lasts one second.

       -s PACKETSIZE, --psize PACKETSIZE
              This option sets the packet size used for probing.  It is in  bytes,  inclusive  IP
              and ICMP headers.

              If  set  to  a negative number, every iteration will use a different, random packet
              size up to that number.

       -B NUM, --bitpattern NUM
              Specifies bit pattern to use in payload.  Should be within range 0 - 255.   If  NUM
              is greater than 255, a random pattern is used.

       -G SECONDS, --gracetime SECONDS
              Use  this  option  to  specify the positive number of seconds to wait for responses
              after the final request. The default value is five seconds.

       -Q NUM, --tos NUM
              Specifies value for type of service field in IP header.  Should be within range 0 -
              255.

       -e, --mpls
              Use  this  option  to tell mtr to display information from ICMP extensions for MPLS
              (RFC 4950) that are encoded in the response packets.

       -I NAME, --interface NAME
              Use the network interface with a specific name for sending  network  probes.   This
              can  be  useful  when  you  have  multiple  network  interfaces with routes to your
              destination, for example  both  wired  Ethernet  and  WiFi,  and  wish  to  test  a
              particular interface.

       -a ADDRESS, --address ADDRESS
              Use this option to bind the outgoing socket to ADDRESS, so that all packets will be
              sent with ADDRESS as source address.  NOTE that this option doesn't  apply  to  DNS
              requests (which could be and could not be what you want).

       -f NUM, --first-ttl NUM
              Specifies with what TTL to start.  Defaults to 1.

       -m NUM, --max-ttl NUM
              Specifies  the  maximum  number  of  hops  (max time-to-live value) traceroute will
              probe.  Default is 30.

       -U NUM, --max-unknown NUM
              Specifies the maximum unknown host. Default is 5.

       -u, --udp
              Use UDP datagrams instead of ICMP ECHO.

       -T, --tcp
              Use TCP SYN packets instead of ICMP ECHO.  PACKETSIZE is ignored, since SYN packets
              can not contain data.

       -S, --sctp
              Use Stream Control Transmission Protocol packets instead of ICMP ECHO.

       -P PORT, --port PORT
              The target port number for TCP/SCTP/UDP traces.

       -L LOCALPORT, --localport LOCALPORT
              The source port number for UDP traces.

       -Z SECONDS, --timeout SECONDS
              The  number  of  seconds  to  keep  probe  sockets  open  before  giving  up on the
              connection.  Using  large  values  for  this,  especially  combined  with  a  short
              interval, will use up a lot of file descriptors.

       -M MARK, --mark MARK
              Set the mark for each packet sent through this socket similar to the netfilter MARK
              target but socket-based.  MARK is 32 unsigned  integer.   See  socket(7)  for  full
              description of this socket option.

ENVIRONMENT

       mtr recognizes a few environment variables.

       MTR_OPTIONS
              This  environment variable allows one to specify options, as if they were passed on
              the command line.  It is parsed before reading the actual command line options,  so
              that options specified in MTR_OPTIONS are overridden by command-line options.

              Example:

              MTR_OPTIONS="-4 -c 1" mtr -6 localhost

              would  send one probe (because of -c 1) towards ::1 (because of -6, which overrides
              the -4 passed in MTR_OPTIONS).

       MTR_PACKET
              A path to the mtr-packet executable, to be used for sending and  receiving  network
              probes.   If MTR_PACKET is unset, the PATH will be used to search for an mtr-packet
              executable.

       DISPLAY
              Specifies an X11 server for the GTK+ frontend.

INTERACTIVE CONTROL

       mtr can be controlled while it is running with the following keys:
         ?|h     help
         p       pause (SPACE to resume)
         d       switching display mode
         e       toggle MPLS information on/off
         n       toggle DNS on/off
         r       reset all counters
         o str   set the columns to display, default str='LRS N BAWV'
         j       toggle latency(LS NABWV)/jitter(DR AGJMXI) stats
         c <n>   report cycle n, default n=infinite
         i <n>   set the ping interval to n seconds, default n=1
         f <n>   set the initial time-to-live(ttl), default n=1
         m <n>   set the max time-to-live, default n= # of hops
         s <n>   set the packet size to n or random(n<0)
         b <c>   set ping bit pattern to c(0..255) or random(c<0)
         Q <t>   set ping packet's TOS to t
         u       switch between ICMP ECHO and UDP datagrams
         y       switching IP info
         z       toggle ASN info on/off
         q       exit

BUGS

       Some modern routers give a lower priority to ICMP  ECHO  packets  than  to  other  network
       traffic.   Consequently,  the  reliability  of  these  routers  reported  by  mtr  will be
       significantly lower than the actual reliability of these routers.

CONTACT INFORMATION

       For the latest version, see the mtr web page at ⟨http://www.bitwizard.nl/mtr/⟩

       For patches, bug reports, or  feature  requests,  please  open  an  issue  on  GitHub  at:
       ⟨https://github.com/traviscross/mtr⟩.

SEE ALSO

       mtr-packet(8),  traceroute(8),  ping(8),  socket(7),  TCP/IP  Illustrated  (Stevens,  ISBN
       0201633469).