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I just ran into the same issue and I'm surprised that this is the only post I can find on the subject.

Thanks to all for your time and suggestions.

The "answer" is here https://serverfault.com/questions/578796/how-can-i-set-one-hostname-and-ip-for-multiple-macs-in-dhcpd-isc-dhcpd-4-1-1-p1

However I think it unwise to edit /var/dhcpd/etc/dhcpd.conf outside of the OPNsense GUI so I've manually set the address for both interfaces in NetworkManager on the laptop.

This does NOT solve the related issue of having a device connect through either an AP or an extender to it so I'd still like to see the devs make this possible through the GUI so I'm creating a feature request on github... https://github.com/opnsense/core/issues/6252

Thank you, cookiemonster, and I'll see if I can make that work but is there a good reason why OPNsense doesn't let me do what I asked for? I'm not bad with networking but by no means an expert or guru so maybe I'm failing to see why I shouldn't be doing it at all. And if that's the case, shouldn't dnsmasq disallow it?

Thanks for the reply and that might be fine for operations within OPNsense but external apps, Uptime Kuma for example, can't deal with that unless I create 2 separate tests for the target and I find that messy.

I'm still fairly new to OPNsense but I have to give thanks for a fabulous product!

One of the laptops I manage has pretty crappy internal Wi-Fi hardware (it works, but slowly) so I've added a USB Wi-Fi dongle which is WAY better. The trouble is that the dongle may or may not get inserted so I want to have the same IP reserved for both but I've not found a way to do this with OPNsense. Until a few months ago I was using a Linux box for my firewall and I had dnsmasq on it for all things DHCP and it allowed me to specify 2 MACs for the same reserved IP address. Worked like a charm. I have not found any way with OPNsense to achieve the same, not even using the dnsmasq service in lieu of DHCPv4/6 services so I'm stuck with the crappy interface even with the better one plugged in.

I also have a 2nd use case for the same feature and that is any device that may connect through a Wi-Fi extender OR the AP it extends. I don't know that all extenders work the same but the one I have replaces the 1st 3 bytes of the MAC address with its own so, again, I need 2 MACs to get the same IP address.

If there is a way to achieve what I want then please point me to it. If not, please consider this a feature request.

BTW, I have tried to find information on this topic to no avail in this forum or any of the OPNsense docs but I'm almost famous for NOT finding the right search terms so it's no surprise if I've missed it.

Thanks much!