MTR(8) mtr MTR(8)
mtr mtr
March 4, 1999
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
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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
packets.
-n
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--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
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March 4, 1999
--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
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).
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