NAME

       fw - fwmark traffic control filter

SYNOPSIS

       tc filter ... fw [ classid CLASSID ] [ action ACTION_SPEC ]

DESCRIPTION

       the  fw  filter  allows  to  classify  packets  based  on  a previously set fwmark by iptables.  If it is
       identical to the filter's handle, the filter matches.  iptables allows to mark single  packets  with  the
       MARK  target, or whole connections using CONNMARK.  The benefit of using this filter instead of doing the
       heavy-lifting with tc itself is that on one hand it might be convenient  to  keep  packet  filtering  and
       classification in one place, possibly having to match a packet just once, and on the other users familiar
       with iptables but not tc will have a less hard time adding QoS to their setups.

OPTIONS

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

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

EXAMPLES

       Take e.g. the following tc filter statement:

              tc filter add ... handle 6 fw classid 1:1

       will match if the packet's fwmark value is 6.  This is a sample iptables statement marking packets coming
       in on eth0:

              iptables -t mangle -A PREROUTING -i eth0 -j MARK --set-mark 6

SEE ALSO

       tc(8), iptables(8), iptables-extensions(8)