Lan to Wan reprise

[Claude Jones]

I had successfully configured an FC3 box at work to serve as internet 
router, firewall, web server, DHCP server to my Lan, etc. Tonight, I 
moved it to its final destination, my home, and I'm completely stuck on 
one issue.
The web server works.
The box has internet access.
Machines on the Lan are getting DHCP assigned IP addresses. They are 
also able to see my lone web page.
However, the machines on the Lan can't get past the firewall. It's not a 
DNS problem because it doesn't go away if you put an IP address in. I 
can ping the Wan NIC from the LAN but nothing further than that.
I've reviewed the procedures over and over  that I used successfully, 
and I can't find the problem.
DHCPD loads without errors.
I've checked and rechecked the firewall and SELinux settings, and they 
appear to be the same as at the office.
I've reviewed the network settings for my NICs twenty times.
IP forwarding and masquerade have been set up.
What have I overlooked??? I have to have this running in three hours so 
any suggestions would be greatly appreciated!

Claude Jones
Bluemont, VA, USA