[63230] in North American Network Operators' Group
Re: ICMP Blocking Woes
daemon@ATHENA.MIT.EDU (Crist Clark)
Tue Sep 30 20:59:29 2003
Date: Tue, 30 Sep 2003 17:58:49 -0700
From: Crist Clark <crist.clark@globalstar.com>
To: John Kristoff <jtk@depaul.edu>
Cc: nanog@merit.edu
Reply-To: crist.clark@globalstar.com
Errors-To: owner-nanog-outgoing@merit.edu
John Kristoff wrote:
>
> 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 if you take that quote from RFC792 absolutely literally,
...no ICMP messages are sent about ICMP messages.
You shouldn't ever respond to a echo request with an echo reply, or
timestamp requests/responses, or netmask request/responses, etc.
--
Crist J. Clark crist.clark@globalstar.com
Globalstar Communications (408) 933-4387
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