This is not typically a policy that is carried out by the providers. It is just how some router vendors have developed their implementations. They don't give a lower priority to UDP or ICMP unless that traffic is destine for the router itself. Although some providers do chose to block traceroutes, but that's a different story. --Mark Kayser MCI Network Operations
-----Original Message----- From: owner-nanog@merit.edu [mailto:owner-nanog@merit.edu]On Behalf Of Marko B. Sent: Tuesday, February 03, 1998 2:17 PM To: nanog@merit.edu Cc: marko@notwork.net Subject: backbone routers' priority settings for ICMP & UDP
Greetings,
In my travels I have heard numerous times that it is a popular practice to give ICMP and even UDP traffic a lower priority on backbone routers in times of congestion.
Are there any providers that document this policy? How is this policy carried out on the actual hardware? Any pointers would be appreciated.
Thanks.
-Marko