Sorry to bump such an old thread, not had the time to look at this until last weekend.
I am now pretty certain that the issue is with the NIC, or Pfsense, and the AP and DHCP works fine through the LAN interface. I've tested different cables and all work fine through the LAN interface.
DHCP just isn't server through the OPT1 interface. I am going to try swapping the interfaces to try to pinpoint what the issue may….
OK swapping had no impact, and the NIC only had an amber light not green light. I am fairly certain the NIC is ok, pretty sure I used it with Fedora before I installed Pfsense on this box.
So now I'm thinking the onboard and Pfsense don't play well together - is there a way to get them to play nice?!