nanog mailing list archives
Re: level3.net in Chicago - high packet loss?!?
From: "Christopher L. Morrow" <christopher.morrow () mci com>
Date: Wed, 07 Sep 2005 02:01:20 +0000 (GMT)
On Tue, 6 Sep 2005 sdb () stewartb com wrote:
On Tue, 6 Sep 2005, Christopher L. Morrow wrote: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. Mostno... not destined TO the router, destined THROUGH the router that happen to TTL=0 ON that router.Very true. Most backbone kit on a tier 1 network is designed to switch
I was really just pointing out that 'traceroute' or 'mtr' send packets with increasing TTL to show 'loss' or 'delay' from place to place, I wasn't trying to debate the every-changing reasons why backbone equipment might or might not answer 'ttl-expired' or 'unreachable' (or any 'exception traffic' really) in a 'timely' fashion. That issue changes with the wind/os/hardware/model.... :) nice to L3 sending in the answer police though :) Thanks! -Chris
Current thread:
- level3.net in Chicago - high packet loss?!? Network Fortius (Sep 05)
- Re: level3.net in Chicago - high packet loss?!? Robert E . Seastrom (Sep 06)
- Re: level3.net in Chicago - high packet loss?!? Network Fortius (Sep 06)
- Re: level3.net in Chicago - high packet loss?!? Joe Maimon (Sep 06)
- Re: level3.net in Chicago - high packet loss?!? chip (Sep 06)
- Re: level3.net in Chicago - high packet loss?!? Christopher L. Morrow (Sep 06)
- Re: level3.net in Chicago - high packet loss?!? sdb (Sep 06)
- Re: level3.net in Chicago - high packet loss?!? Christopher L. Morrow (Sep 06)
- Re: level3.net in Chicago - high packet loss?!? sdb (Sep 07)
- Re: level3.net in Chicago - high packet loss?!? Network Fortius (Sep 06)
- Re: level3.net in Chicago - high packet loss?!? Robert E . Seastrom (Sep 06)
- Re: level3.net in Chicago - high packet loss?!? Steven M. Bellovin (Sep 06)
- Re: level3.net in Chicago - high packet loss?!? Network Fortius (Sep 06)
- Re: level3.net in Chicago - high packet loss?!? Alexander Koch (Sep 06)
- Re: level3.net in Chicago - high packet loss?!? Network Fortius (Sep 06)
- Re: level3.net in Chicago - high packet loss?!? Scott Altman (Sep 06)
- Re: level3.net in Chicago - high packet loss?!? Adam Rothschild (Sep 06)
- Message not available
- Re: level3.net in Chicago - high packet loss?!? Jay R. Ashworth (Sep 06)
- RE: level3.net in Chicago - high packet loss?!? andrew2 (Sep 06)
- Re: level3.net in Chicago - high packet loss?!? Jared Mauch (Sep 06)