I'm managing a big building, with a lot of services/vendors and I have a DMZ'd 4-port cable modem, Model: SMC8014, that has 4 separate networks branching off each of its 4 ports. Each network has its own equipment (Its own router/firewall). It's very difficult for me to mess with those networks.
I need to add yet another network that is directly on the WAN and normally I would just plug it into the extra slot on the modem. However, the modem is full. So I'm wondering... Would it mess anything up if I bought a switch to "add more ports" to my modem? I mean can I directly connect a switch to my modem, then from there attach X networks, all with their own routers?
Otherwise, plan B would be to buy a bigger modem, if they make them.
I'm assuming I'd have to get my ISP to give me another IP address for the extra networks as well.