I had so much trouble getting opnsense to work with Frontier fiber. Apparently Frontier does a non standard thing with their DHCP packets by tagging them as VLA

I had so much trouble getting opnsense to work with Frontier fiber. Apparently Frontier does a non standard thing with their DHCP packets by tagging them as VLAN 0 and opnsense DHCP client was just silently dropping those. OpenWRT and Frontier’s router were fine. After three days I figured it out and now just have to compile my own version when I upgrade. I did submit a PR but not sure if it made it into a release.