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That was really helpful and allowed me to find a similar post https://forum.opnsense.org/index.php?topic=26468.msg127815#msg127815

Blocking the dhcp and modifying the DHCP config allowed the WAN link to come up.

Thanks again.

I'm trying to get my OPNsense setup working and hitting an issue with the DHCP assignment to the WAN. I've searched through a bunch of similar posts but most have no outcome or solution.

My network layout is below:

hub4 -> netgear g324 switch -> esxi host (uplink) -> OPNsense VM.

I've a vlan assigned to the port that the hub4 connects to which isolates traffic to just the OPNsense VM.

I'm able to place the hub4 into modem mode and this appears to be successful. Initially the OPNsense VM receives a DHCP IP in the 192.168.100.x range which matches the range that the hub4 is in when operating in modem mode.

This should then change to a public IP from Virgin but this process doesn't complete (this is what happens if I connect a windows VM to the same uplink instead of the OPNsense VM).

I'd rather avoid building a physical box for this so if anyone has similar experience or managed to get it working, I'd love to hear from you.