mtr - phpMan

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
[PACKETSIZE]

DESCRIPTION
mtr combines the functionality of the traceroute and ping programs in a single net-
work 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).

-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 net-
work 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/.

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mail to mtr AT lists.com.

Bug reports and feature requests should be sent to the mtr mailing list.