I have a Netgear router which runs Tomato and at the moment I have a Huawei E5170s-22 connected to the WAN port of it. This works like a charm, but now I'd like to connect an AVM Fritz!Box between the Netgear and the Huawei and use it as a VoIP-Gateway. All other LAN ports are in use and the FritzBox only has 100MBit/s Ethernet and therefore I don't want it in my GBit LAN behind the Netgear router.
I already wrote an IP like 126.96.36.199 into the 'Route Modem IP' field, but of course that didn't work. Is it possible to set this up so that I can access both web frontends and how can I do it?