Firewall problem: Only works on a restart.

[Steven W. Orr]

I have a minor mystery and I don't know how to debug it.

I have two computers in the house. Machine A has two NICS, one of which is 
hooked to the cable modem and sees the outside world. Also, Machine A 
implements the IPTABLES firewall with NAT. Machine B and Machine A's 2nd 
NIC are hooked up to a little hub. Ever since I upgraded to F10, I notice 
that Machine B can't see the outside world unless I restart the firewall. 
And just to make it interesting,

iptables -L > before
restart the firewall
iptables -L > after

diff before after
result is no difference

I'm wide open to a suggestion on how to fix this. And please don't tell me 
to restart the firewall in rc.local. ;-)

TIA

-- 
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individuals! What if this weren't a hypothetical question?
steveo at syslang.net