Provided by: mtr_0.85-2_amd64 bug

NAME

       mtr - a network diagnostic tool

SYNOPSIS

       mtr     [-hvrctglspeniuTP46]     [--help]     [--version]    [--report]    [--report-wide]
       [--report-cycles COUNT] [--curses]  [--split]  [--raw]  [--mpls]  [--no-dns]  [--show-ips]
       [--gtk]  [--address IP.ADD.RE.SS]  [--interval SECONDS] [--psize BYTES | -s BYTES] [--tcp]
       [--port PORT] [--timeout SECONDS] HOSTNAME [PACKETSIZE]

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  miliseconds  and  the
       percentage of packetloss.

OPTIONS

       -h

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

       -v

       --version
              Print the installed version of mtr.

       -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.

       -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 BYTES

       --psize BYTES

       PACKETSIZE
              These  options  or  a  trailing PACKETSIZE on the command line 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 upto that number.

       -t

       --curses
              Use  this  option  to  force  mtr  to  use  the curses based terminal interface (if
              available).

       -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.

       -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

       --order fields order
              Use this option to specify the fields and their order when loading mtr.
              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"

       -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+.

       -p

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

       -l

       --raw
              Use  this  option  to  tell mtr to 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.

       -a IP.ADD.RE.SS

       --address IP.ADD.RE.SS
              Use this option to bind outgoing packets' socket to specific interface, so that any
              packet will be sent through this interface. NOTE that this option doesn't apply  to
              DNS requests (which could be and could not be what you want).

       -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.

       -u
              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.

       -P PORT

       --port PORT
              The target port number for TCP traces.

       --timeout SECONDS
              The  number  of  seconds  to  keep  the  TCP  socket  open  before giving up on the
              connection. This will only affect the final  hop.  Using  large  values  for  this,
              especially combined with a short interval, will use up a lot of file descriptors.

       -4
              Use IPv4 only.

       -6
              Use IPv6 only.

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/.

       The mtr mailinglist was little used and is no longer active.

       Bug reports and feature requests should be submitted to the launchpad mtr bugtracker.

SEE ALSO

       traceroute(8), ping(8) TCP/IP Illustrated (Stevens, ISBN 0201633469).