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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
-4 Use IPv4. Shortcut for -family inet.
-6 Use IPv6. Shortcut for -family inet6.
-0 Use a special family identifier meaning that no networking pro-
tocol 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.