Torsten Luettgert wrote:
On Thu, 2006-06-22 at 11:28 -0300, Luciano wrote:
Hi all,
Is it possible to use TC (HTB) in vlan interfaces ?
Where can I find more documentation ?
Yes, that is possible. VLAN interfaces are really
different from the physical interface they reside
on, kernel-wise.
For example, if you put a 1 MBit HTB on eth0,
but no qdisc on VLAN device eth0.1, traffic through
eth0.1 won't be throttled at all. I suspect the same
goes for iptables rules (but didn't try that yet).
Let me explain...
Due to the fact that vlan id's add some 4 bytes to the header of the
packet, tc filter does not work properly unless you feed it with an
offset and a hex match. I use 801.q and TC with iptables and tc filter
rules based on iptables mark with great success. I admit it is more
complicated this way, but it works...
iptables -A FORWARD -t mangle -d xxx.xxx.xxx.xxx -j MARK --set-mark 12
iptables -A FORWARD -t mangle -d xxx.xxx.xxx.xxx -j RETURN
tc class add dev eth0 parent 10:1 classid 10:112 htb rate 20Mbit ceil
20Mbit ..............
tc filter add dev eth0 parent 10:0 protocol 802.1q prio 90 handle 12 fw
flowid 10:112
tc qdisc add dev eth0 parent 10:112 handle 10112 sfq perturb 10
class htb 10:112 parent 10:1 leaf 112: prio 0 rate 20000Kbit ceil
20000Kbit burst 2Kb cburst 11597b
Sent 9638423935 bytes 12057262 pkt (dropped 0, overlimits 0 requeues 0)
rate 268048bit 37pps backlog 0b 0p requeues 0
lended: 11929727 borrowed: 127535 giants: 0
tokens: 806 ctokens: 4719
For documentation, see the LARTC howto and the docs
on the HTB home page. There are also some ready-made
shaping scripts which can help you understanding how
all this works.
Regards,
Torsten
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