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 packets.
- -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.
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).