[TriLUG] Odd Network problem

[Chris Knowles]

Got a weird one.  

(Oh, regarding that crashing box, further investigation pointed at the 
motherboard as a culprit.)

I've got a Nagios server in place that's been happily warning us of doom and 
gloom for over a year.  It's one of the great success stories for Linux at 
our company.

Until now.

Starting this morning, it has been randomly unable to ping various boxes on 
our network.  That is, until you ping the nagios server from the "unpingable" 
server.   Then Nagios can ping that server all it wants. 

This is all local network, no routing involved.  

Any idears as to what could be causing this?  (This is a simple switched 
network, and other than this seems to be working fine.)

Any help is appreciated.  

CJK
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