How you proceed is going to depend on how the cameras connect to the network (wired or wireless) and how you have icamsource configured (with auto-router config or manual port forwarding). If the cameras are wireless and you're using the auto-config router option in icamsource, the easiest thing would be change the new router settings (SSID, password, encryption-type, etc) to match the old router. Otherwise you're probably going to have to connect the cameras (at least temporarily) to the router via an Ethernet cable so that you can connect to them and change the settings so that they can connect to the new wifi.