IP-MONITOR(8) Linux IP-MONITOR(8)
ip-monitor, rtmon - state monitoring
ip monitor [ all | OBJECT-LIST ] [ file FILENAME ] [ label ] [ all-nsid ] [ dev DEVICE ]
-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>
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, nsid and nexthop. 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: <BROADCAST,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 displayed 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 network 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.
Original Manpage by Michail Litvak <email@example.com> Manpage revised by Nicolas Dichtel <firstname.lastname@example.org>
This page is part of the iproute2 (utilities for controlling TCP/IP networking and traffic) project. Information about the project can be found at ⟨http://www.linuxfoundation.org/collaborate/workgroups/networking/iproute2⟩. If you have a bug report for this manual page, send it to email@example.com, firstname.lastname@example.org. This page was obtained from the project's upstream Git repository ⟨https://git.kernel.org/pub/scm/network/iproute2/iproute2.git⟩ on 2021-04-01. (At that time, the date of the most recent commit that was found in the repository was 2021-03-22.) If you discover any rendering problems in this HTML version of the page, or you believe there is a better or more up-to-date source for the page, or you have corrections or improvements to the information in this COLOPHON (which is not part of the original manual page), send a mail to email@example.com iproute2 13 Dec 2012 IP-MONITOR(8)
Pages that refer to this page: ip(8)