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.
-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
-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 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.
-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.
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.
