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

NAME         top

       route - route traffic control filter

SYNOPSIS         top

       tc filter ... route [ from REALM | fromif TAG ] [ to REALM ] [
               classid CLASSID ] [ action ACTION_SPEC ]

DESCRIPTION         top

       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         top

       action ACTION_SPEC
              Apply an action from the generic actions framework on matching

       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

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

EXAMPLES         top

       Consider the subnet being attached to eth0:

              ip route add 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         top

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

SEE ALSO         top

       tc(8), ip-route(8)

COLOPHON         top

       This page is part of the iproute2 (utilities for controlling TCP/IP
       networking and traffic) project.  Information about the project can
       be found at 
       If you have a bug report for this manual page, send it to,  This page was obtained
       from the project's upstream Git repository 
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       manual page), send a mail to

iproute2                         21 Oct 2015       Route classifier in tc(8)