Spotty Lookups on One of Our Networks

Martin McCormick martin at dc.cis.okstate.edu
Wed Oct 31 19:29:39 UTC 2012


	The system hung long enough to have timed out on every
possible DNS that it could have tried so it should have gotten
to one.

Barry Margolin writes:
> Did the problem coincide with Hurricane Sandy? That would explain
> inability to reach many east coast servers. Resolvers should work around
> this by failing over to other servers (assuming the organization has
> them geographically distributed, as NOAA.GOV does), but dig +trace
> doesn't.

	Thank you very much for your suggestions. 
	We are more or less in a waiting mode right now as the
network staff on our remote campus check some settings on their
firewall. We know now this is almost certainly not a bind issue
as we have discovered many remote networks that seem to have no
TCP/IP connectivity from the remote campus but are perfectly
reachable from here. 

	We started receiving complaints about a week ago so the
hurricane is not to blame.

	I will let the group know what happened as soon as we
find out, ourselves.

Martin McCormick



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