MTR(8)									mtr								    MTR(8)

NAME

       mtr - a network diagnostic tool

SYNOPSIS

       mtr [-hvrctglspeniu46] [--help] [--version] [--report] [--report-wide] [--report-cycles COUNT] [--curses] [--split] [--raw] [--mpls] [--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 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 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 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 packetsize upto that number.

       -t

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

       -e

       --mpls
	      Use  this  option to tell mtr to display information from ICMP extensions for MPLS (RFC 4950) that are encoded in the response pack-
	      ets.

       -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 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 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  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.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 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.xmis-
       sion.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)