Re: [LARTC] TC using vlan interface

[Radu Oprisan <radu@securesystems.ro>]

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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