We recently expaned our office to a second floor and I need to have those computers use the same router for internet connection. Here is the setup.
There is a Netopia router connected to a Sysmantec Gateway Firewall that is connected to a couple of switches that connects the computers. After moving the web/exchange server and some workstations to the second office, I realized that the web/exchange server had an external address and was connected directly to the router and not going through the firewall.
Dilema: The connection up from the second floor is one single link. Where do I plug the cable into? If I connect it to the switch that is behind the firewall then the web/exchange server will not be able to be utilized however the workstations will be fine because their IP addresses are subnetted in the firewall. If I connect it directly to the router then the workstations are causing collisions on the router and firewall "LAN IP x.x.x.x is SPOOFED", which is bringing my network down to a crawl.
Tidbits: All workstations(both floors) are members of same domain/LAN except web/exchange server.
What should I do?