[Samba] no DNS functionality on second subnet

Andreas Habel andreas.habel at uis.no
Fri Aug 30 06:00:20 UTC 2019

-----Original Message-----
From: samba <samba-bounces at lists.samba.org> On Behalf Of Rowland penny via samba
Sent: torsdag 29. august 2019 16:33
To: samba at lists.samba.org
Subject: Re: [Samba] no DNS functionality on second subnet

On 29/08/2019 13:50, Andreas Habel via samba wrote:
> Hi,  > > we have successfully installed our samba4 AD domain with AD 
> DC,
smb > file server and Windows/Linux clients in the same subnet. > > Now we try to add a couple of Windows PCs to the domain that are > located in a different subnet. As soon as the AD DC is added as the > DNS server on the Windows clients it is no longer possible to resolve > ip addresses. In other words, for those PCs DNS is not working. > > We added - the new clients to our DNS using samba-tool dns add > - a new reverse lookup zone for the new subnet and filled it > using samba-tool dns add - a new subnet in RSAT Active > Directory Sites and Services > > Routing seems to be OK - we can run telnet <IP of AD DC> 53 from one > of the "new" Windows clients and a connection will be established. > However, analyses from wireshark/tshark show that on DNS requests > there is never an answer from our AD DC. > > It seems that we are missing something here - any help would be > appreciated. > > Andreas 

Does 'telnet <DC short hostname> 53' work ?


No, neither short name or FQDN work:

C:\Users\Administrator>telnet smbdc 53
Connecting To smbdc...Could not open connection to the host, on port 53: Connect failed

C:\Users\Administrator>telnet smbdc.ier.ux.uis.no 53
Connecting To smbdc.ier.ux.uis.no...Could not open connection to the host, on port 53: Connect failed


Andreas Habel
Petroleum engineering lab
Geosciences | Unix network
Faculty of Science and Technology
University of Stavanger

Phone: +47-51 83 22 93

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