I'm trying to replace an old router with m0n0wall but here is my problem.. I 
have a very large subnet of 20 bits or 255.255.240.0.. 
Need to break this down to 24 bit networks or 255.255.255.0 say, 
xxx.xxx.240.0/24 through xxx.xxx.255.255/24.

All the internal IPs are public and should stay that way.

I can get traffic out just fine no problem however I cannot get any incoming 
traffic except on two unrelated subnets xxx.xxx.240.0/24 and xxx.xxx.248.0/24 
but nothing else.

I'm assuming that these two subnets are working because my upstream is routing 
them to me as 24 bit networks. Any ideas on how I can get this working 
without involving the upstream provider using m0n0wall?

The upstream router is xxx.xxx.30.121/30 and my WAN interface is 
xxx.xxx.30.122/30

Any help is apreciated.
-- 
Christopher Tyler
Atlas Communications
http://www.getatlas.com
(417) 883-1700