Using macOS Big Sur 11.4 clients to connect to DHCP and DNS on a Linux
Ubuntu 20.04 LTS server. Both DHCP and DNS are working fairly well. macOS
clients who obtain a DHCP lease or click to renew in their network settings
get the update list of DNS servers. However, the DNS Search Domains
list does not populate. I made sure to remove manual overrides before
testing. Without this list, all the macOS clients have trouble using DNS
because hosts on different local domains and subnets are not located.

My settings in Dualserver have been tested in both the {GLOBAL_OPTIONS] and
[RANGE_SET] sections:
DomainSearch=zmmapple.com, dc.mro.local, mro.local

I have also attempted to use option no. 119 as described in the manual, to
no avail.

This is an important feature for us on a DHCP server. Any suggestions?

Frank Kyosho Fallon
My pronouns are: He, HIm