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I have two buster servers that get assigned static IPs via DHCP (dhclient). the DHCP server assigns all parameters including domain (mydomain.org). One server works fine, i.e. hostname -f. On this server /etc/resolv.conf is correct:

 # Generated by NetworkManager
    search mydomain.org
    nameserver x.x.x.x

hostname -f on the working server returns the FQDN as it should.

But the other server doesn't get the domain properly. hostname -f simply returns the hostname and /etc/resolv.conf isn't populated as per the DHCP settings:

# Generated by NetworkManager
search lan
nameserver x.x.x.x

If I manually run sudo dhclient -4 -v /etc/resolv.conf gets updated properly with search mydomain.org. However, after a restart or systemctl restart NetworkManager /etc/resolv.conf returns to the incorrect state.

What am I missing here? How do I get networkmanager to properly assign the search domain in /etc/resolv.conf?

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Turns out NetworkManager looks at config files in /etc/NetworkManager/system-connections. Looking at the file Wired Connection 1 in that folder, I found some static assignments under the [ipv4] heading, specifically the problem was with this line:

[ipv4]
dns-search=lan

removing that line and restarting NetworkManager with systemctl restart NetworkManager fixed the problem.

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