> Not certain if this is correct ... but I might not be understanding what
> you mean by two subnets.
>
> I have up to found Linux boxes ... static 192.168.2.{10,11,12,13}
>
> I have a Linksys WRT54GL (192.168.2.3) that 3 of the Linux boxes are
> wired into. That WRT is connected to a larger net which eventually has
> Verizon out to internet. I am localizing the tests to only run on two of
> the Linux boxes which are wired into that WRT to minimize "points of
> failure"
Based on the above you have one subnet of 192.168.2.0/24 with 192.168.2.3 as the gateway.
I think there was some confusion when you mentioned firewall rules on your router. Traffic between hosts on the same subnet do not go via the gateway but are direct instead.
Rewinding a little. At this point does a netstat -anp | grep ":25" show any of the systems listening on 0.0.0.0 or are they only listening on 127.0.0.1 still?
If that is not corrected then firewall rules are moot.
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