Alex,
Local Networks is correct, my bad.
I have SME and IPCop on the internet at my central location. IPCop is my WAN/LAN IPSEC router. The SME is used to filter internet with squidguard and watch web surfing with sarg. Since users at the central location use SME as a gateway, I had to add my remote LANs in the local networks in server manager. This way users can communicate with systems on other LANs if necessary, but only traffic to 192.168.3.0, and 192.168.5.0 gets redirected from SME to IPCop. Central location is 192.168.1.0. Hope that helps you.
Web request come in? I am not sure what you mean, but in bound traffic is determined by DNS and your setup at your remote sites. Your dhcp server should be your SME (on high speed connection) so all systems use that server for gateway. If your using Windows or other Linux for dhcp, simply change the assigned gateway/router that gets handed out to clients.
ryan