man > tc-route(8)

Route classifier in tc(8)                       Linux                      Route classifier in tc(8)

NAME
       route - route traffic control filter

SYNOPSIS
       tc filter ... route [ from REALM | fromif TAG ] [ to REALM ] [ classid CLASSID ] [ action AC‐
               TION_SPEC ]

DESCRIPTION
       Match  packets  based on routing table entries. This filter centers around the possibility to
       assign a realm to routing table entries. For any packet to be classified by  this  filter,  a
       routing  table  lookup  is  performed and the returned realm is used to decide on whether the
       packet is a match or not.

OPTIONS
       action ACTION_SPEC
              Apply an action from the generic actions framework on matching packets.

       classid CLASSID
              Push matching packets into the class identified by CLASSID.

       from REALM
       fromif TAG
              Perform source route lookups.  TAG is the name of an interface which must  be  present
              on the system at the time of tc invocation.

       to REALM
              Match if normal (i.e., destination) routing returns the given REALM.

EXAMPLES
       Consider the subnet 192.168.2.0/24 being attached to eth0:

              ip route add 192.168.2.0/24 dev eth0 realm 2

       The following route filter will then match packets from that subnet:

              tc filter add ... route from 2 classid 1:2

       and pass packets on to class 1:2.

NOTES
       Due  to implementation details, realm values must be in a range from 0 to 255, inclusive. Al‐
       ternatively, a verbose name defined in /etc/iproute2/rt_realms may be given instead.

SEE ALSO
       tc(8), ip-route(8)

iproute2                                     21 Oct 2015                   Route classifier in tc(8)