[LARTC] Directing traffic to prio qdisc bands

[LARTC] Directing traffic to prio qdisc bands

[Oded Shaham]

Hi,
I want to use the prio qdisc for prioritizing outgoing TCP SYNs over all
other outgoing traffic.
I have managed to attach a prio qdisc to the root of an Ethernet device, by:

tc qdisc add dev eth0 root handle 1: prio

Now I want to do 2 things:
1. create a filter to catch TCP SYNs, and attach it to band 0 (highest
priority).
2. direct all other traffic to higher bands (1 or 2).

I know how to define the appropriate filter with u32; there is a similar
example in the LARTC HOWTO, for capturing ACKs. What I don't know is how to
direct the traffic captured by a filter to a specific band. In the HOWTO I
only see examples for attaching filters to CBQ classes.

Can someone advise me on this one ?

Best Regards,
Oded

Oded Shaham
Flash Networks
16 Galgalei Haplada, Herzliya, Israel
Tel: +972-9-9580666 ext. 215
Fax: +972-9-9564888
Cell phone: +972-5-4552009 
Email: oded@flashnetworks.com


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Re: [LARTC] Directing traffic to prio qdisc bands

[Stef Coene]

I think it's easier to use ipchains :

ipchains -A output -m 1	# Mark every packet with "1"
ipchains -A output -m 2 -y -p tcp # Mark SYN with "2"

The filter rules :

tc filter add $DEV parent 10: protocol ip prio 3 handle 2 fw classid
10:2	# Put SYN in sub class 10:2
tc filter add $DEV parent 10: protocol ip prio 3 handle 2 fw classid
10:2	

(I don't know the exact syntax for the prio-qdisc)


Staf

More QOS info : http://users.belgacom.net/staf/


Oded Shaham wrote:
> 
> Hi,
> I want to use the prio qdisc for prioritizing outgoing TCP SYNs over all
> other outgoing traffic.
> I have managed to attach a prio qdisc to the root of an Ethernet device, by:
> 
> tc qdisc add dev eth0 root handle 1: prio
> 
> Now I want to do 2 things:
> 1. create a filter to catch TCP SYNs, and attach it to band 0 (highest
> priority).
> 2. direct all other traffic to higher bands (1 or 2).
> 
> I know how to define the appropriate filter with u32; there is a similar
> example in the LARTC HOWTO, for capturing ACKs. What I don't know is how to
> direct the traffic captured by a filter to a specific band. In the HOWTO I
> only see examples for attaching filters to CBQ classes.
> 
> Can someone advise me on this one ?
> 
> Best Regards,
> Oded
> 
> Oded Shaham
> Flash Networks
> 16 Galgalei Haplada, Herzliya, Israel
> Tel: +972-9-9580666 ext. 215
> Fax: +972-9-9564888
> Cell phone: +972-5-4552009
> Email: oded@flashnetworks.com
> 
> _______________________________________________
> LARTC mailing list / LARTC@mailman.ds9a.nl
> http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://ds9a.nl/2.4Routing/

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http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://ds9a.nl/2.4Routing/