[dns-operations] Queries for earthlink.net not consistently succeeding

Frank Bulk - iName.com frnkblk at iname.com
Thu Jun 17 17:42:09 UTC 2010

It was our e-mail gateways that alerted me to an issue sending e-mail to
earthlink.net.  The e-mail gateways weren't able to obtain an MX or A record
for earthlink.net.

I've tested from my Windows laptop (which is behind an ASA) and from our
*nix server (public IP) and I'm getting mixed results -- our three Windows
DNS servers (behind the same ASA) time out, even after having their cache
flushed.  Five of our own *nix DNS servers behind a load-balancer happily
supply a response, but two others (we control recursive, so providing the
IPs doesn't help) and our upstream DNS server ( just time out.
Google's DNS is fine, but doesn't respond.  I'm testing by doing
"dig A earthlink.net @<DNS IP>"

Any ideas what's going on?


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