timeouts from one machine and not another

[David Bishop]

I have two nagios servers checking basically the same machines (we don't
need no stinking failover).  However, from one machine (A), I get a lot of
time-out errors on certain machines (it times out when checking smtp and 
ftp) and on the other, I don't.  If I try it from the command-line (just 
telnetting to the ports), it hangs for a long time (long being greater 
than 10 seconds) but finally connects.  However, connecting to the same 
machine from B, it's instantaneous.  Normally I'd suspect the network 
connection between the two machines (client and A), but a reverse 
connection works very quickly (connecting to A's smtp port), and they 
are both on underutilized 1.5Mb lines.  Ping time between them (either 
way) averages slightly over 100ms. The only real difference that I can
think of between A and B is that A is running FreeBSD 5.2.1 and B is
Debian/Sid.  The clients are all also running Debian (if that matters).

Help, please :-(

D.A.Bishop


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