MTR(8)				      mtr				MTR(8)



NAME
       mtr - a network diagnostic tool



SYNOPSIS
       mtr	[-hvrctglspni46]      [--help]	    [--version]     [--report]
       [--report-cycles COUNT] [--curses] [--split] [--raw] [--no-dns] [--gtk]
       [--address IP.ADD.RE.SS]   [--interval SECONDS]	 [--psize BYTES  |  -s
       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.


       -s 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+.


       -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	inter
	      face. NOTE that this option doesnt 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)