[LocoCoyote]

I am not sure I understand:

You network goes like this?
ISP
Router (using DHCP from ISP and providing DHCP for network)
Linux file & print server
everything else

I assume everything else is connected directly to the router?
I also assume the server has a dedicated connection to the router and that it provides it's server functions through the router?

let me know I may be able to help.

The official redHat docs have some fairly good info onsetting up smb. should apply to most distros.