Local DNS IP keeps deleting itself


Occasional Visitor

Recently I have noticed a strange and very annoying issue in LAN > DHCP server settings page, "DNS and WINS Server Setting" section: the DNS IP address keeps deleting itself automatically, every time the WAN loses its connection. After WAN connection is restored, I have to manually enter again the DNS Server 1 to and run a ipconfig /release && ipconfig /renew command on every network client to have them use again my DNS IP.

My setup:
Router Asus RT-AX88U, 386.3_2
Private DNS, Raspberry Pi running Pi-Hole,

Anybody know why is this happening, please?

Many thanks in advance.


Part of the Furniture
FWIW, I tried doing the same thing w/ my RT-AC68U and had no such problems. Whether I disconnected/reconnected the WAN cable, or did a reboot, the DNS IP remained.

What happens if you specify a public IP (e.g.,

On a lark, try adding the same IP ( to the second DNS server field as well.


Part of the Furniture
Check your nvram usage on the tools page....if the available space is less than about 3K you can run into cases where nvram cannot be maintained.

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