@crossroads1112:
How would I configure pfsense to issue IPS to the phone and TV?
By default pfSense issues IP addresses dynamically from its internal DHCP server. Most consumer devices (TVs and phones) are also configured to receive IP addresses dynamically from a DCHP server. So no additional configuration is necessary in most cases. This configuration should simply just work:
Devices <–> switch/hub <--> [LAN pfSense WAN] <–> [LAN modem WAN] <–> internet
This is the simplest configuration and the one that pfSense is specifically preconfigured for. You can actually test it without making any changes to the modem and it should still work anyway although there will be a double NAT performed (once by pfSense and once by the modem). Steps to test:
1. Plug in everything according to above diagram
2. Configure pfSense with all defaults except change the LAN IP address to be different from the one the modem is using. (192.168.20.1 as divsys suggested)
3. Reboot everything in this order so that all the devices get issued new IP's: modem, pfsense, devices
This setup should simply work. If it does, then you can remove the double NAT from the design by reconfiguring the modem for bridging only, then reboot the modem and pfsense and pfSense should pick up a public IP and everything should continue to "just work".
@crossroads1112:
Alternatively would there be a way to configure pfsense to just pass that traffic along to the modem and let it handle the TVs and phones?
Yes, although it's a bit more involved and shouldn't be necessary in most scenarios. You could place an additional switch between pfSense and the modem for those devices, or create a DMZ, or use 1:1 NAT, or bridging, etc. I would try the test setup above first to see if it works. If it turns out that the TV and phone have to connect to the modem, then things get a bit more complicated. You'll want to review the ISP's requirements to determine the best configuration at that point.