simple load-distribution setup - but weird behaviour

[Per Jessen <per@computer.org>]

Hi,

we're using iptables in a fairly primitive load-distribution setup - 

iptables -t nat -A OUTPUT -d 192.168.3.200 -j DNAT --to
192.168.3.101-192.168.3.108

All traffic originates on the local machine. It's been working fine for
quite a while, but today I noticed that only 7 of the 8 machines in the
cluster are being distributed to - 101,102,104,105,106,107,108 but not 103. 

There isn't an awful lot of traffic, perhaps 2-3 msgs/min. Kernel is 2.4.24. 
I tried telnet'ing to 103 (port 10025) which worked fine - and following
that 103 was suddenly also being distributed to automagically.

Is there a way of determining why 103 was not being distributed to? Or when
if this happens again, what can/should I look at? 


cheers
/Per Jessen, Zurich