If you're worried about the set-top box or FiOS router on your LAN, set up a router with two different LAN networks. My setup has a pfsense box connected to th

If you're worried about the set-top box or FiOS router on your LAN, set up a router with two different LAN networks. My setup has a pfsense box connected to the Internet with a "LAN" and "DMZ" network behind it. The set top box and FiOS router (among other things) are in the DMZ and my PC, etc are in the LAN. Devices in the DMZ are prevented from communicating with LAN devices. I don't know if DD-WRT supports something similar, but I like the general solution.