I'm helping out a small organization with their networking. Yesterday something destroyed one of their switches and one of their firewalls. The only thing I could do was to replace both for the time being with a standard WRT54G. I got that running just fine, and I added a 24-port switch today. Everything works as it should...except...

This side of their network uses the IP address range of 192.168.200.xxx. In the router's configuration screen, I have DHCP starting at 192.168.200.1 and a maximum of 30 users. My problem is that it won't let me assign more users. If I tell it to start higher (I have machines on this network with assigned addresses from 1 to 9), it shrinks the number of maximum users I can have.

Why is this happening? Is this a limitation of the device I'm using? Previously the firewall was acting as DHCP server, distributing the signal to at least 40-50 computers.

Thanks for any help you can offer.