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IP-MONITOR(8)                        Linux                       IP-MONITOR(8)

       ip-monitor, rtmon - state monitoring

       ip monitor [ all | LISTofOBJECTS ]

       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 fol-

       ip monitor [ all | LISTofOBJECTS ]

       OBJECT-LIST is the list of object types that we want to monitor.  It may contain link, address and route.  If
       no file argument is given, ip opens RTNETLINK, listens on it and dumps state changes in the format described in
       previous sections.

       If a file name is given, it does not listen on RTNETLINK, but opens the file containing RTNETLINK messages
       saved in binary format and dumps them.  Such a history 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.

       Certainly, it is possible to start rtmon at any time.  It prepends the history with the state snapshot dumped
       at the moment of starting.


       Original Manpage by Michail Litvak <>

iproute2                          20 Dec 2011                    IP-MONITOR(8)