I did not do the original design of the network. This is a small business with 12 workgroup terminals. The entire network has been run with static IP. The linksys router is not set up to hand out addresses(DHCP). The network runs fine and I do have internet access. I know that with the exception of a couple of terminals (network printers, application server) that the network should probably be run with dynamic IP. I really have a hard time explaining this to the owner. It has been run this way for so long he doesn't understand the change.
We recently switched from Windstream To AT&T, again not my decision, and I had the privilege of overseeing the process. When this happened AT&T installed their router/modem and to keep my network addressing the same I put my router in behind it. This worked fine a was able to access the Linksys management console to cinfigure the IP addresses for the gateway and DNS servers. Even now, the network runs fine, however I cant access the control panel of my router. I have had this problem before but it was always due to the nodes being on different networks. That is not the case here.