DNS lookup problems specific the Facebook domains

[Rob Tanner]

Hi,

I'm trying to figure out if this is my problem or a Facebook problem.  
The first issue was with facebookmail.com.  The cache entry would become 
corrupt and I would have to clear cache to get things back to working 
again.  Since facebookmail.com resolves to a single IP address, my work 
around was to make my internal DNS authoritative for it and the problem 
went away.

A week ago, DNS lookups for  facebook.com failed completely.  Even 
restarting the DNS  service didn't fix the problem.  Currently, and as a 
temporary fix only, I am forwarding facebook,com lookups to an 
off-campus server which does not seem to have the problem.  And now, as 
of last night, lookups to fbcdn.net (which apparently hosts stylesheets) 
fail completely and I've implemented the same forwarding scheme there as 
well.  I've been tracking resource allocations on the Linux box that 
hosts the DNS just to see if there might be some connection there, and 
as far as I can tell, there isn't anything there that might explain it.

Being that we are a four year residential college, the heaviest hit on 
our DNS servers are students, and Facebook is the singularly most 
heavily used external service.  Also, as far as I can tell, we are 
having no problems looking up any other addresses.  Has anyone else seen 
this problem with Facebook or does this problem sound familiar with any 
other sites.  I'm baffled and any ideas about what to look for would be 
most appreciatd.

Thanks,

Rob Tanner
Linfield College
McMinnville, Oregon
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