Monitor IP does not mean that this will be used as DNS server. Simply don't care about this You can put any public IP here if you want...
Look at this site:https://docs.opnsense.org/manual/aliases.htmlYou need alias type host, there is a good example for youtube. Just add all sites you want to reach via WAN there.Regarding monitor IP you can also put the endpoint IP of your WG server there like we did in the first steps. But, as said, this has the disadvantage that for GW status it will always say "up" just because the connection to your WG server is established. In this case this does not mean that also internet via VPN is working.Putting a public IP like 8.8.4.4 GW status is "up" when VPN is established AND internet via VPN working.
Endpoint IP of your WG server is the servers WG IP... We used this IP in step 2 there:Step 2 is configuring WG client on sense.2a) Configure according to step 1-6 https://docs.opnsense.org/manual/how-tos/wireguard-selective-routing.htmlPay particular attention for step 6 "monitor IP". Please set debians's WG endpoint IP, later we will change it.
Yes it is... See post #5 screenshot...