Provided by: iproute2_4.3.0-1ubuntu3_amd64 bug


       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).