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MTR(8)					       mtr					   MTR(8)

NAME
       mtr - a network diagnostic tool

SYNOPSIS
       mtr	[-hvrctglspniu46]     [--help]	   [--version]	   [--report]	  [--report-wide]
       [--report-cycles COUNT]	  [--curses]	 [--split]     [--raw]	   [--no-dns]	  [--gtk]
       [--address IP.ADD.RE.SS] [--interval SECONDS] [--psize BYTES | -s BYTES] HOSTNAME [PACKET-
       SIZE]

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 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.

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
	      performance.

       -w

       --report-wide
	      This option puts mtr into wide report mode.  When in this mode, mtr  will  not  cut
	      hostnames in the report.

       -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

	      If  set  to a negative number, every iteration will use a different, random packet-
	      size upto that number.

       -t

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

       -n

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

       -o fields order

       --order fields order
	      Use this option to specify the fields and their order when loading mtr.
	      Example: -o "LSD NBAW"

       -g

       --gtk
	      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  http://www.gtk.org/  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 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.

       -u
	      Use UDP datagrams instead of ICMP ECHO.

       -4
	      Use IPv4 only.

       -6
	      Use IPv6 only.

BUGS
       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.

CONTACT INFORMATION
       For the latest version, see the mtr web page at http://www.bitwizard.nl/mtr/.

       Subscribe  to  the  mtr mailing list.  All mtr related announcements are posted to the mtr
       mailing list.  To subscribe, send email to majordomo@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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