pfSense

With the move to the Kea DHCP server, local resolution of DHCP names in the DNS relay has gone away. A reasonable workaround is to enable the Kea DHCP-DDNS service and send updates to the DNS server. While these changes to config files are relatively simple and outside the scope of the files managed by pfSense itself (/usr/local/etc/kea/kea-dhcp-ddns.conf and /usr/local/etc/kea/keactrl.conf), changes do have to be made to /usr/local/etc/kea/kea-dhcp4.conf.

Of course, a better solution would be to outright add support for the Kea DHCP-DDNS service and have a configuration page for it. This would solve a number of problems in Windows environments where it makes more sense to run DHCP from the firewall and DNS on the domain controllers.