I feel this is a very basic setup question but I am also new to networking stuff so I am asking anyways. I have my OpnSense machine plugged into my Motorola MB8600 modem (which by default just functions as a bridge) into a two port gigabit NIC (Amazon B09D3JL14S), with another cord plugged into a switch with my devices. I can access the web GUI for OpnSense, but I cant access the internet from my current setup. What am I missing? The WAN DHCP address is coming up 0.0.0.0. Only thing ive noticed is the IP for the modem is 192.168.100.1, and the default of OpnSense is 192.168.1.1, not sure if thatd affect anything. I tried setting the WAN IP to match the router IP using static IP, which also did nothing.
Figured it out, just needed to configure DNS properly
Glad you fixed it. You may find The Home Network Guy useful - especially if you use Xfinity. You may also want to protect against cablehaunt (again see his article).
As you are new to networking, Gibson Research Corporation has “Shields UP” which helps you check your firewall config from the Internet.