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

	      If  set to a negative number, every iteration will use a differ-
	      ent, random packetsize upto that number.

       -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 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.


       -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)