[84133] in North American Network Operators' Group
Re: level3.net in Chicago - high packet loss?!?
daemon@ATHENA.MIT.EDU (Christopher L. Morrow)
Tue Sep 6 13:09:46 2005
Date: Tue, 06 Sep 2005 17:09:16 +0000 (GMT)
From: "Christopher L. Morrow" <christopher.morrow@mci.com>
In-reply-to: <64a8ad9805090607521cbf00fe@mail.gmail.com>
To: chip <chip.gwyn@gmail.com>
Cc: nanog <nanog@merit.edu>, jmaimon@ttec.com
Errors-To: owner-nanog@merit.edu
On Tue, 6 Sep 2005, chip wrote:
> On 9/6/05, Joe Maimon <jmaimon@ttec.com> wrote:
> >
> >
> > If the hop(s) following the one you see loss for shows no loss, then
> > disregard the loss for that hop, obviously whatever it is, it does not
> > affect transit, which is what you really want to know.
> >
> > Is that correct?
> >
> >
> This is one of the most misunderstood concepts in properly reading output
> from a traceroute (mtr, visualtraceroute, whatever). Basically you are
> seeing loss of packets destined directly *TO* that router, not THRU it. Most
no... not destined TO the router, destined THROUGH the router that happen
to TTL=0 ON that router.
which is also misunderstood by just about everyone :( but anyway... 'not
affecting transit' for reasons sited by yourself and min and adam already,
yes.
