mtr

MTR(8)                                mtr                               MTR(8)



NAME
       mtr - a network diagnostic tool



SYNOPSIS
       mtr       [-hvrctglsni]       [--help]      [--version]      [--report]
       [--report-cycles COUNT] [--curses] [--split] [--raw] [--no-dns] [--gtk]
       [--address IP.ADD.RE.SS]   [--interval SECONDS]   [--psize BYTES  |  -p
       BYTES] 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 purposly  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  per-
       centage and response times of the internet route to HOSTNAME.  A sudden
       increase in packetloss or response time is often an indication of a bad
       (or simply overloaded) link.


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  perfor-
              mance.


       -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.  This option is only
              useful with the -r option.


       -p BYTES

       --psize BYTES

       PACKETSIZE
              These options or a trailing PACKETSIZE on the  commandline  sets
              the  packet  size used for probing.  It is in bytes inclusive IP
              and ICMP headers

       -t

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


       -n

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


       -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.gimp.org/gtk/  for  more  information about
              GTK+.


       -s

       --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 inter-
              face. 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  parame-
              ter is one second.


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.bitwiz-
       ard.nl/mtr/.


       Subscribe  to  the mtr mailing list.  All mtr related announcements are
       posted to the mtr mailing list.  To subscribe,  send  email  to  major-
       domo@lists.xmission.com  with subscribe mtr in the body of the message.
       To send a message to the mailing list, mail to  mtr@lists.xmission.com.


       Bug  reports  and  feature  requests  should be sent to the mtr mailing
       list.



SEE ALSO
       traceroute(8), ping(8).



mtr                              March 4, 1999                          MTR(8)