Feature #12551
open
Add ability to set DNS resolver search domain list
0%
Description
As it exists right now, the Domain set in System > General is added as a search domain in /etc/resolv.conf.
It would be nice to have a way to set additional search domains.
Perhaps something like a comma-separated list of "Additional DNS search domains" in a field below the domain there. Or perhaps down in the DNS configuration area.
Consideration should probably also be given to search domains provided from a WAN DHCP server. Probably controlled by the override checkbox there or a separate, similar toggle.
I don't see a category that really fits so I'm setting DNS Resolver here.
Updated by → luckman212 about 1 month ago
Until or if ever this exists, I found that it does work to encode the domain list in hex and add it under DHCP Server > Additional BOOTP/DHCP Options:
E.g. to add the domains lan. and internal. to your DHCP search scope, you would use:
Option: 119 Type: String Value: 03:6C:61:6E:00:08:69:6E:74:65:72:6E:61:6C:00
Tested and working as of macOS 15.3 + Windows 11.
Also N.B.– RFC3397 https://www.rfc-editor.org/rfc/rfc3397.html describes a more efficient way to encode the hex when there are multiple related subdomains, e.g. marketing.acme.com, sales.acme.com and asia-pacific.acme.com but I haven't figured that out yet.