Subject: Routing for UDP/real-time vs TCP

From: "Bogdan Ghita" <[email-masked]>
Date: Wed, 4 Oct 2000 16:36:05 +0100

Dear all

I have a question related to general routing issues:
I am looking into measuring RTT for a specific path using 2 different methods: TCP acknowledgements and RTCP NTP/LSR/DLSR fields.
Is there any specification regarding different handling by the servers of packets that carry TCP segments vs packets carrying UDP datagrams? I had several discussions lately about how some/all routers tend to drop first ICMP traffic, then TCP traffic and, at the end, UDP traffic, as the first category is not critical and the second can recover. If so, it would mean that there are several different transport performance rates for the same path, depending on the type of traffic being sent. Are the assumption/conclusion correct? Could you point me to some materials that detail this matter?

Thank you very much

Best regards
Bogdan Ghita