Provided by: iproute2_4.3.0-1ubuntu3_i386 bug

NAME

       ip-monitor, rtmon - state monitoring

SYNOPSIS

       ip  [ ip-OPTIONS ] 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
       and nsid.  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
       contain RTNETLINK messages saved in binary format.  Such a 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.

       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@owl.openwall.com>
       Manpage revised by Nicolas Dichtel <nicolas.dichtel@6wind.com>