[Samba] Samba DNS fails when queried with nslookup commands

[L.P.H. van Belle]

Hai,

Only the forwarder is running in this systemd setup. 
This :  127.0.0.53:53 does NOT conflict with normaly resolv.conf setting
Because samba or any dns server does not run on 127.0.0.53  
Dont make the mistake to see this for : 127.0.0.1 

Please show : 
/etc/hosts 
/etc/resolv.conf 

Depending on which one your using:

/etc/network/interfaces and/or 


/etc/netplan/01-netcfg.yaml 
/etc/systemd/network/..  Output of all files in this folder. 
/etc/systemd/resolved.conf 

On one (or more)  of these files is a misconfiguration. 

Greetz, 

Louis
 

> -----Oorspronkelijk bericht-----
> Van: samba [mailto:samba-bounces at lists.samba.org] Namens 
> Rowland penny via samba
> Verzonden: donderdag 13 augustus 2020 8:19
> Aan: samba at lists.samba.org
> Onderwerp: Re: [Samba] Samba DNS fails when queried with 
> nslookup commands
> 
> On 12/08/2020 21:49, James Atwell via samba wrote:
> > Hello,
> >
> >      Having issues with a DC not responding to DNS requests. OS is 
> > Ubuntu 18.04.4 LTS. Samba version 4.12.2 compiled from source. 
> > Checking to see what is listening on port 53 reports;
> >
> > @soldc4:~# netstat -tulpn | grep ":53"
> > tcp        0      0 127.0.0.53:53 0.0.0.0:* LISTEN      
> > 2935/systemd-resolv
> > tcp6       0      0 :::53 :::*                    LISTEN 
> 2694/samba: 
> > task[dn
> > udp        0      0 127.0.0.53:53 0.0.0.0:*                 
>           
> > 2935/systemd-resolv
> > udp6       0      0 :::53 :::* 2694/samba: task[dn
> >
> >
> > How do I disable systemd-resolve and ensure only samba is 
> listening on 
> > port 53 for DNS requests?  You can see below nslookup succeeds when 
> > querying another server in the network but fails on this one.
> >
> > root at soldc4:~# nslookup google.com soldc1
> > Server:         soldc1
> > Address:        172.16.23.28#53
> >
> > Non-authoritative answer:
> > Name:   google.com
> > Address: 172.217.7.238
> > Name:   google.com
> > Address: 2607:f8b0:4004:806::200e
> >
> > root at soldc4:~# nslookup google.com soldc4
> > ;; connection timed out; no servers could be reached
> >
> Last time I set up a DC on 18.04 I did this:
> 
> sudo systemctl stop systemd-resolved
> sudo systemctl disable systemd-resolved.service
> 
> Rowland
> 
> 
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