[Samba] DNS problem ubuntu server 20.04

[L.P.H. van Belle]

> >
> That is possible on a Unix domain member, but, in my opinion, 
> you would 
> have to remove systemd-resolve on a DC
> 
> Run <sudo netstat -plnt | grep '53'> on a newly installed 
> Ubuntu 20.04 
> and you get this:
> 
> tcp        0      0 127.0.0.53:53 0.0.0.0:*               LISTEN      
> 451/systemd-resolve
> 
> This would interfere with the AD dns server.
> 

No, that a wrong understanding in my optinion.

Per example. The client requests. 
Can be command like dig or hostname these query on the stub-resulver  127.0.0.53:53 
So you must configure systemd networking + resolving if you use it. 

but a client computer quering port 53 on the server its real ip, not on 127.0.0.53 and so does not use the stub-resolver.  Only the server itself throught client requests. 

The stub-resolver  passed the request to the ip you configure on the interface the request is comming from/going to. 

That how i configure it. 
Now is that handy, thats an other question but i have a full running setup where AD-DC's and Members also use the Stub-resolvers without any problems. 



Greetz, 

Louis