[Samba] NetworkManager, DNS, and resolv.conf

[L.P.H. van Belle]

Is a good read on this subject. 

https://www.ricmedia.com/set-permanent-dns-nameservers-ubuntu-debian-resolv-conf/ 
https://www.ricmedia.com/set-custom-dns-servers-on-ubuntu-18-or-20/



> -----Oorspronkelijk bericht-----
> Van: samba [mailto:samba-bounces at lists.samba.org] Namens 
> Patrick Goetz via samba
> Verzonden: dinsdag 8 maart 2022 16:35
> Aan: Jürgen Echter
> CC: Samba listserv
> Onderwerp: Re: [Samba] NetworkManager, DNS, and resolv.conf
> 
> On 3/8/22 01:02, Jürgen Echter wrote:
> > Hi,
> > 
> > for me it worked when i disabled auto-dns and set the 
> search domain and 
> > dns server manually like this:
> > 
> > nmcli con mod enp1s0 ipv4.ignore-auto-dns yes
> > nmcli con mod enp1s0 ipv4.dns "192.168.1.80"
> > nmcli con mod enp1s0 ipv4.dns-search "samdom"	
> > 
> 
> Presumably ignore-auto-dns=yes  sets
> 
>    [main]
>    dns=none
> 
> in /etc/NetworkManager.conf?  I couldn't get this to work on 
> my Ubuntu 
> 20.04 test VM:
> 
> root at erap-ubuntu:~# nmcli
> enp0s3: connected to Wired connection 1
> ...
> 
> root at erap-ubuntu:~# nmcli con mod enp0s3 ipv4.ignore-auto-dns yes
> Error: unknown connection 'enp0s3'.
> 
> Not sure I get that one, and the option doesn't even show up in the 
> graphical interface; maybe this is an Ubuntu Mate specific 
> modification.
> 
> However, to be clear, there are N ways to get around this, 
> but the point 
> of my post was that a user with a NetworkManager system following the 
> Wiki page on setting up a Samba client would get confused by the 
> /etc/resolv.conf instructions when NetworkManager restarts 
> and rewrites 
> resolv.conf, and further that the systemd-resolved stub file entry:
> 
>    nameserver 127.0.0.53
> 
> works fine on Samba clients as long as you've set the correct AD 
> nameserver entry in the system-connections file using either nmcli or 
> the graphical interface.  This is then set dynamically on boot in
> 
>     /run/systemd/resolve/resolv.conf
> 
> If you just followed the previous Wiki instructions and had 
> configured a 
> different nameserver on installation, domain name resolution 
> would break 
> as soon as the system reboots because NetworkManager will reset it by 
> default, at least on Ubuntu systems.  Simple is best as long 
> as simple 
> works.
> 
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