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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,
       stats, 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 con-
       tain RTNETLINK messages saved in binary format.  Such a file can be
       generated with the rtmon utility. This utility has a command line syn-
       tax 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.
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)