North American Network Operators Group

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RE: DNS issues?

  • From: Jon Lewis
  • Date: Fri Jul 20 21:48:44 2007

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

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                |
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