nanog mailing list archives
Re: ICMP Blocking Woes
From: "Kevin Oberman" <oberman () es net>
Date: Wed, 01 Oct 2003 10:32:21 -0700
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
Current thread:
- Re: ICMP Blocking Woes Kevin Oberman (Oct 01)
- <Possible follow-ups>
- Re: ICMP Blocking Woes Sean Donelan (Oct 01)
- Re: ICMP Blocking Woes Stephen J. Wilcox (Oct 02)
- PING monitoring (was Re: ICMP Blocking Woes) Sean Donelan (Oct 03)
- Re: ICMP Blocking Woes Stephen J. Wilcox (Oct 02)