[97936] in North American Network Operators' Group
RE: DNS issues?
daemon@ATHENA.MIT.EDU (Jon Lewis)
Fri Jul 20 21:45:08 2007
Date: Fri, 20 Jul 2007 21:35:03 -0400 (EDT)
From: Jon Lewis <jlewis@lewis.org>
To: Erik Amundson <Erik.Amundson@oati.net>
cc: nanog@nanog.org
In-Reply-To: <DA088AB42E20F841A1CDBDD0564B8E2D01FA4F9A@EXVSA.dev.oati.local>
Errors-To: owner-nanog@merit.edu
On Fri, 20 Jul 2007, Erik Amundson wrote:
> I was having issues reaching any of the roots, and any of the TLDs for
> .com and .net. I tested them directly, and had no luck.
It's more likely they were having trouble reaching you. My guess is that
much of your return traffic normally comes to you over your XO connection.
During whatever routing issue XO had, they continued to propogate your
route(s) and receive traffic for you from the "internet", but were unable
to route that traffic across their network to you.
I've seen similar things happen with other providers. During such
breakage, shutting your BGP session to them doesn't always help.
> I was merely looking to see if anything was broken elsewhere in the
> world to see if it was just my network so I could diagnose things a bit
> better.
With the distributed nature of the DNS roots, if all the root servers
suddenly "break", you can be nearly 100% sure the problem is much closer
to the observer than to all the root servers or the "internet" in general.
----------------------------------------------------------------------
Jon Lewis | I route
Senior Network Engineer | therefore you are
Atlantic Net |
_________ http://www.lewis.org/~jlewis/pgp for PGP public key_________
