mtr



MTR(8)                                mtr                               MTR(8)




NAME

       mtr - a network diagnostic tool




SYNOPSIS

       mtr      [-hvrctglsni46]      [--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.


       -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.


       -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.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)

Man(1) output converted with man2html