North American Network Operators Group

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RE: backbone routers' priority settings for ICMP & UDP

  • From: Mark Kayser
  • Date: Tue Feb 03 17:55:23 1998

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: [email protected] [mailto:[email protected]]On Behalf Of
> Marko B.
> Sent: Tuesday, February 03, 1998 2:17 PM
> To: [email protected]
> Cc: [email protected]
> 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