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       rtmon - listens to and monitors RTnetlink


       rtmon [ options ] file FILE [ all | LISTofOBJECTS ]


       This manual page documents briefly the rtmon command.

       rtmon listens on netlink socket and monitors routing table changes.

       rtmon  can be started before the first network configuration command is
       issued.  For example 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.


       rtmon supports the following options:

              Print version and exit.

       help   Show summary of options.

       file FILE [ all | LISTofOBJECTS ]
              Log output to FILE. LISTofOBJECTS is the list  of  object  types
              that  we  want  to  monitor.   It may contain ’link’, ’address’,
              ’route’  and  ’all’.  ’link’  specifies  the   network   device,
              ’address’ the protocol (IP or IPv6) address on a device, ’route’
              the routing table entry and ’all’ does what the name says.

       -family [ inet | inet6 | link | help ]
              Specify protocol family. ’inet’ is IPv4, ’inet6’ is IPv6, ’link’
              means  that no networking protocol is involved and ’help’ prints
              usage information.

       -4     Use IPv4. Shortcut for -family inet.

       -6     Use IPv6. Shortcut for -family inet6.

       -0     Use a special  family  identifier  meaning  that  no  networking
              protocol is involved. Shortcut for -family link.


       # rtmon file /var/log/rtmon.log
              Log to file /var/log/rtmon.log, then run:

       # ip monitor file /var/log/rtmon.log
              to display logged output from file.




       rtmon was written by Alexey Kuznetsov <>.

       This manual page was written by Michael Prokop <>, for the
       Debian project (but may be used by others).