ICMP Blocking Woes

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

> > 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&gt;

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.