matchall - traffic control filter that matches every packet tc " " filter " ... " matchall " [ " skip_sw " | " skip_hw " ] [ " action ACTION_SPEC " ] [ " classid CLASSID " ]" The matchall filter allows to classify every packet that flows on the port and run a action on it.

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 .

skip_sw Do not process filter by software. If hardware has no offload support for this filter, or TC offload is not enabled for the interface, operation will fail.

skip_hw Do not process filter by hardware.

To create ingress mirroring from port eth1 to port eth2: The first command creats an ingress qdisc with handle ffff: on device eth1 where the second command attaches a matchall filters on it that mirrors the packets to device eth2. To create egress mirroring from port eth1 to port eth2: The first command creats an egress qdisc with handle 1: that replaces the root qdisc on device eth1 where the second command attaches a matchall filters on it that mirrors the packets to device eth2. To sample one of every 100 packets flowing into interface eth0 to psample group 12: tc (8),