[rbak-nsp] PWFQ to prioritise L2TP towards LAC

[Richard Clayton]

Ian

You actually answered the question that was at the back of my mind which
was, does the OS mark L2TP control and if so with what value, I assumed it
didn't mark L2TP control with anything so I would somehow have to mark with
a combination of policy access list and metering policy, I already have a
pwfq policy which prioritises CS6 which, thanks to your info I now know will
do the trick.

The other reason for the question was to see if anybody suggested a metering
policy to mark L2TP control on the same interface as the pwfq policy as we
have had some problems when attempting this.

Is there a list of all the packets that the OS marks by default?

Thanks
Rick

On 1 March 2011 20:17, Ian Calderbank <ian at calderbankconsulting.co.uk>wrote:

> Richard,
>
> Very short question could be answered in many ways....
>
> To classify l2tp - its udp 1701 (you knew that right?) but that's probably
> not what you want to do?
>
> Probably what you do want:
> Classify and mark on the subscriber level. Optionally queue per-sub.  copy
> DSCP from subscriber inner IP to l2tp outer ip using "qos propagate"
> commands. Then use that outer DSCP in a BA classifier for a queuing policy
> in your transport network between LNS and LAC.
> L2tp control is marked by default as CS6 by the box.
>
> Pay me a few notes and I'll set it up for you :-)
>
> ta
> Ian
>
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>   1. PWFQ to prioritise L2TP towards LAC (Richard Clayton)
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> ----------------------------------------------------------------------
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> Message: 1
> Date: Mon, 28 Feb 2011 21:11:05 +0000
> From: Richard Clayton <sledge121 at gmail.com>
> To: redback-nsp at puck.nether.net
> Subject: [rbak-nsp] PWFQ to prioritise L2TP towards LAC
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> Content-Type: text/plain; charset="iso-8859-1"
>
> I have an Ethernet connection with incoming L2TP tunnels terminating on a
> loopback and I have been advised to prioritise L2TP traffic towards the
> LAC.
> How/where can I classify L2TP packets for priority queueing on egress.
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