Date: Tue, 30 Sep 2003 19:36:23 -0500 From: John Kristoff <jtk@depaul.edu> Sender: owner-nanog@merit.edu

On Tue, Sep 30, 2003 at 05:22:25PM -0700, Crist Clark wrote:

...

...

Wasn't this based upon the premise that gear should not return ICMP errors as a result of ICMP packet input as a precaution against error loops? ie said dodgy router did the _right_ thing?

...

That would be disingenious. RFC1122 clearly lists which ICMP are error messages,

The following from W. Richard Stevens' archive presents some additional insight:

<http://www.kohala.com/start/papers.others/vanj.99feb08.txt>

But note the date of this (1988). Clearly, router vendors are handling this much better today, in light of 1122. Today tracert almost works as well as traceroute. -- R. Kevin Oberman, Network Engineer Energy Sciences Network (ESnet) Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab) E-mail: oberman@es.net Phone: +1 510 486-8634