Traffic shaping: tc filter attached to an HTB class

filterqostc

Can I attach a tc filter to an HTB class rather than to an HTB qdisc?

For example: 

tc class add dev $IF_LAN parent 1:100 classid 1:180 htb rate 19kbit ceil 2000kbit prio 4

where:

 1:100 -> Is an HTB inner class.

This question arises from the fact that I could be able to attach a tc filter to a class without throwing an error but later when I saw the tc statistics I realized that there is no filtering being made.

Thanks in advance.

EDIT: I found in the tc manual tc-filter syntax:

tc  filter  [  add  |  change  | replace ] dev DEV [ parent qdisc-id | root ] protocol prootocol prio priority filtertype [ filtertype specific parameters ] flowid flow-id

(the relevant part is parent qdisc-id)

So, I only can be able to attach a filter to a qdisc or there is a workaround?

Best Answer

Should be possible, we use:

/sbin/tc qdisc add dev $DEV root handle 1: htb default 1
/sbin/tc class add dev $DEV parent 1: classid 1:3 htb rate $RATE burst $BURST
/sbin/tc filter add dev $DEV parent 1:0 protocol ip prio 1 u32 match ip src $IP flowid 1:3

The third line attaches a filter to the class defined in the second line (classid 1:3 and flowid 1:3).

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