Hi all, Came across an interesting tip today that I thought there may be others here that will like to hear it - some of you probably already know it! ;-) Carrying dscp differentiated traffic across l2tp tunnel means that the dscp attributes on the payload packets are essentially hidden from the routers carrying l2tp tunnel. So, how to copy dscp from payload to tunnel headers? Obvious technique like packet mark or connection mark doesn't work since packet/connection marks are also apparently lost in encapsulated tunnel packet (as we should probably expect ;) "priority" value, however, is preserved, so one way to copy dscp to the l2tp packets is to first match relevant dscp packets and set come priority value - then add dscp value on output interface carrying l2tp tunnel with same priority. Hands up if you already knew this? You might say that you would have guessed it, but we all know how easy it is to claim that in retrospect! :-D Cheers! Mike.
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Mike Everest