Joe Touch wrote: >> QoS (not CoS but real QoS) capable routers must inspect L4. > > That must be why there are QoS indicators in the L4 header. There are not. > Oh, wait - those are in L3 (RFC2474 and its successors). Can you read this? QoS (not CoS but real QoS) > Yes, layering is a difficult concept. Layering is trivially easy. If you think it difficult, that is your problem. Masataka Ohta