[rbak-nsp] PWFQ to prioritise L2TP towards LAC

[Ian Calderbank]

I like to answer the question someone was going to ask next J

 

The system marks all packets that it originates as cs6 by default. This is
the same on most big-box routers.

 

The only way to separate l2tp control from l2tp data with a metering policy
on the interface that carries the tunnel is on DSCP. They are otherwise
identical at that point (udp 1701 src/dst=tunnel endpoints)

 

Cheers

Ian

 

From: Richard Clayton [mailto:sledge121 at gmail.com] 
Sent: 01 March 2011 20:51
To: Ian Calderbank
Cc: redback-nsp at puck.nether.net
Subject: Re: [rbak-nsp] PWFQ to prioritise L2TP towards LAC

 

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 

 

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