What's the magic bedind: Merlin » LAN » DHCP Server » Manually Assigned IP: "DNS Server (Optional)"

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New Around Here
Good evening
Thank you very much for sharing your great work.

Asuswrt-Merlin has a new interesting setting if one add a fixed IP Address in the LAN-DHCP Server configuration:


Does anybody knows how we can use it / what it is doing?

Thanks a lot for any help!
kind regards,


Part of the Furniture
That setting has been around for awhile. Present in Asus firmware too. As it says you can assign the manual client a specific DNS Server


Regular Contributor
One potential use is to bypass the defaul DHCP assigned DNS servers for one specific client.

In the past I've used it to test (ex: testing pihole with one client on the network, via DHCP assignment vs. manually assigned) in preparation for rolling out a new service for all clients.

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