ubuntu 20.04 resolv.conf and systemd-resolved

[Robert Heller]

When I was running Ubuntu (various versions) I found systemd-resolved to be a 
pain in the ass and almost always did things wrong.  I generally disabled it.

At Wed, 21 May 2025 19:22:10 -0600 R C <cjvijf at gmail.com> wrote:

> 
> Hello,
> 
> 
> I am using ubuntu 20.04 on an rpi,  and it's  dns resolution is  messed 
> up  (I work with rhel)  so  not that experienced here.
> 
> 
> My resolve.conf looks like;
> 
> nameserver 127.0.0.53
> options edns0 trust-ad
> search my-domain.com
> 
> 
> but it should more look like;
> 
> search my-domain.com
> nameserver 192.168.1.1
> 
> systemd-resolved is throwing this:
> 
> May 21 17:15:24 seismo systemd-resolved[682]: Using degraded feature set 
> (UDP) for DNS server 192.168.1.1.
> May 21 17:21:18 seismo systemd-resolved[682]: Grace period over, 
> resuming full feature set (UDP+EDNS0) for DNS server 192.168.1.1.
> May 21 17:25:25 seismo systemd-resolved[682]: Using degraded feature set 
> (UDP) for DNS server 192.168.1.1.
> May 21 17:28:54 seismo systemd-resolved[682]: Using degraded feature set 
> (UDP) for DNS server 192.168.1.1.
> May 21 17:47:35 seismo systemd-resolved[682]: Using degraded feature set 
> (UDP) for DNS server 192.168.1.1.
> May 21 18:11:57 seismo systemd-resolved[682]: Grace period over, 
> resuming full feature set (UDP+EDNS0) for DNS server 192.168.1.1.
> May 21 18:13:04 seismo systemd-resolved[682]: Using degraded feature set 
> (UDP) for DNS server 192.168.1.1.
> May 21 18:59:45 seismo systemd-resolved[682]: Using degraded feature set 
> (UDP) for DNS server 192.168.1.1.
> May 21 19:04:57 seismo systemd-resolved[682]: Grace period over, 
> resuming full feature set (UDP+EDNS0) for DNS server 192.168.1.1.
> May 21 19:04:57 seismo systemd-resolved[682]: Using degraded feature set 
> (UDP) for DNS server 192.168.1.1.
> 
> 
> is this something I need to fix in netplan (started happening after an 
> update), or stop using that and use something else?  (whatever that is 
> on ubuntu)
> 
> 
> thanks,
> 
> 
> Ron
> 
> 
> 
> 
> 

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