Using DHCP Search Domains on Windows DHCP Clients¶
The DNS Search Domain functionality present in the DHCP Server settings in
pfSense® software is only supported by some DHCP clients; pfSense software uses
the standard DHCP option
119 mechanism to deliver the search domains to
clients which request them.
Support for Option
119 was finally added in Windows 10 version 1803 released
in April 2018. Unfortunately, older versions of the Microsoft Windows DHCP
client do not support requesting option
119, so no matter which DHCP
server is used, clients running older versions of Microsoft Windows can never
receive or use a search domain list from DHCP. Upgrade clients to a supported
release to use this functionality.
If older clients must use these settings and they cannot be upgraded, the setting can be pushed via GPO instead of DHCP.