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MTR(8)					       mtr					   MTR(8)

       mtr - a network diagnostic tool

       mtr  [-hvrctglsni]  [--help]  [--version]  [--report]  [--report-cycles COUNT]  [--curses]
       [--split]  [--raw]  [--no-dns]	[--gtk]   [--address IP.ADD.RE.SS]   [--interval SECONDS]

       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  percentage  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  over-
       loaded) link.


	      Print the summary of command line argument options.


	      Print the installed version of mtr.


	      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

       -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

	      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


	      Use this option to force mtr to use the curses based terminal interface (if  avail-


	      Use  this  option to force mtr to display numeric IP numbers and not try to resolve
	      the host names.


	      Use this option to force mtr to use the GTK+ based X11 window interface (if  avail-
	      able).   GTK+ must have been available on the system when mtr was built for this to
	      work.  See the GTK+ web page at for more information about


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


	      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.

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

       For the latest version, see the mtr web page at

       Subscribe  to  the  mtr mailing list.  All mtr related announcements are posted to the mtr
       mailing list.  To subscribe, send email to with subscribe mtr
       in  the	body  of  the  message.   To  send  a  message	to  the  mailing  list,  mail  to

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

       traceroute(8), ping(8).

mtr					  March 4, 1999 				   MTR(8)
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