#2146·DnsServer

DHCP leases to Static IP interface on Ubuntu26 and deletes A record

Author: D1StrXCreated Sep 12, 2026Updated Sep 14, 2026

Specifically on Ubuntu 26.04 machines that have a static IP set, Technitium DHCP leases an IP on reboot of the Ubuntu 26.04 host and/or deletes the A record randomly of that host. (host.domain.tld). Probably because the lease expired.

Only worthy thing I can see in the logs is

Check for update was done {dnsServerEnableCheckForUpdate: True; updateAvailable: False; updateVersion: 15.4;}

But even with dhcp4: false set in netplan and applying that, after a reboot it consistently updates the A record with a DHCP IP.

Source: TechnitiumSoftware/DnsServer