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IP-MONITOR(8) Linux IP-MONITOR(8)
NAME
ip-monitor, rtmon - state monitoring
SYNOPSIS
ip monitor [ all | OBJECT-LIST ] [ file FILENAME ] [ label ] [ all-nsid ] [ dev DEVICE ]
OPTIONS
-t, -timestamp
Prints timestamp before the event message on the separated line in format:
Timestamp: <Day> <Month> <DD> <hh:mm:ss> <YYYY> <usecs> usec
<EVENT>
-ts, -tshort
Prints short timestamp before the event message on the same line in format:
[<YYYY>-<MM>-<DD>T<hh:mm:ss>.<ms>] <EVENT>
DESCRIPTION
The ip utility can monitor the state of devices, addresses and routes continuously. This
option has a slightly different format. Namely, the monitor command is the first in the
command line and then the object list follows:
ip monitor [ all | OBJECT-LIST ] [ file FILENAME ] [ label ] [ all-nsid ] [ dev DEVICE ]
OBJECT-LIST is the list of object types that we want to monitor. It may contain link,
address, route, mroute, prefix, neigh, netconf, rule and nsid. If no file argument is
given, ip opens RTNETLINK, listens on it and dumps state changes in the format described
in previous sections.
If the label option is set, a prefix is displayed before each message to show the family
of the message. For example:
[NEIGH]10.16.0.112 dev eth0 lladdr 00:04:23:df:2f:d0 REACHABLE [LINK]3: eth1: <BROAD-
CAST,MULTICAST> mtu 1500 qdisc pfifo_fast state DOWN group default
link/ether 52:54:00:12:34:57 brd ff:ff:ff:ff:ff:ff
If the all-nsid option is set, the program listens to all network namespaces that have a
nsid assigned into the network namespace were the program is running. A prefix is dis-
played to show the network namespace where the message originates. Example:
[nsid 0]10.16.0.112 dev eth0 lladdr 00:04:23:df:2f:d0 REACHABLE
If the file option is given, the program does not listen on RTNETLINK, but opens the given
file, and dumps its contents. The file should contain RTNETLINK messages saved in binary
format. Such a file can be generated with the rtmon utility. This utility has a command
line syntax similar to ip monitor. Ideally, rtmon should be started before the first net-
work configuration command is issued. F.e. if you insert:
rtmon file /var/log/rtmon.log
in a startup script, you will be able to view the full history later.
Nevertheless, it is possible to start rtmon at any time. It prepends the history with the
state snapshot dumped at the moment of starting.
If the dev option is given, the program prints only events related to this device.
SEE ALSO
ip(8)
AUTHOR
Original Manpage by Michail Litvak <mci AT owl.com>
Manpage revised by Nicolas Dichtel <nicolas.dichtel AT 6wind.com>
iproute2 13 Dec 2012 IP-MONITOR(8)
Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
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