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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]
       [--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.  After it determines the address of each net‐
       work hop between the machines, it sends a sequence ICMP	ECHO  requests
       to  each	 one to determine the quality of the link to each machine.  As
       it does this, it prints running statistics about each machine.

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.

       -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)
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