[Samba] Samba4 internal DNS not responding to DNS requests

[felix at epepm.cupet.cu]

> I am not able to get the Samba4 internal DNS server to respond to DNS
> requests on the network.
>
> I am running Samba4 4.1.0pre1-GIT-c1fb37d on my CentOS 6.3 system.  I
> followed the instructions here:
> https://wiki.samba.org/index.php/Samba_AD_DC_HOWTO
>
> I configured Samba4 to use the internal DNS server.  My Samba4 server is
> 192.168.0.13. Its full hostname is ubuntu-ad.allenlan.net.  The realm is
> ALLENLAN.NET.
>
> The DNS testing section of the document passes:
>
> $host -t SRV _ldap._tcp.allenlan.net.
>     _ldap._tcp.allenlan.net has SRV record 0 100 389
> ubuntu-ad.allenlan.net.
> $host -t SRV _kerberos._udp.allenlan.net.
>     _kerberos._udp.allenlan.net has SRV record 0 100 88
> ubuntu-ad.allenlan.net.
> $host -t A ubuntu-ad.allenlan.net.
>     ubuntu-ad.allenlan.net has address 192.168.0.13
>
> I configured my Windows XP system with a DNS of 192.168.0.13 (Samba4
> server).
> When I perform the Windows command "nslookup ubuntu-ad.allenlan.net" (or
> any variation of that) it reports:
>     DNS request timed out.
>         timeout was 2 seconds.
>     *** Can't find server name for address 192.168.0.13: Timed out
>     (above 3 messages repeat again)
>     Default servers are not available
>     Server: UnKnown
>     Address: 192.168.0.13
>
> The Windows system can ping the Samba4 server by IP address.
>
> Any help would be appreciated!  More configuration information below.
>
> /etc/resolv.conf:
> domain allenlan.net
> nameserver 192.168.0.13
>
> /usr/local/samba/etc/smb.conf:
> [global]
>         workgroup = ALLENLAN
>         realm = ALLENLAN.NET
>         netbios name = UBUNTU-AD
>         server role = active directory domain controller
>         dns forwarder = 192.168.0.1
>         interfaces = 192.168.0.13 127.0.0.1
>         bind interfaces only = yes
>         log level = 3
>         server services = smb, rpc, nbt, wrepl, ldap, cldap, kdc, drepl,
> winbind, ntp_signd, kcc, dnsupdate, dns
>
> /etc/hosts:
> 192.168.0.13    ubuntu-ad       ubuntu-ad.allenlan.net
> 127.0.0.1   localhost localhost.localdomain localhost4
> localhost4.localdomain4
> ::1         localhost localhost.localdomain localhost6
> localhost6.localdomain6
>
> $hostname
> ubuntu-ad.allenlan.net
>

That was the reason I switched to bind9. The internal dns server used to
keep connections open, without closing old ones, until reaching the limit
of max files...
I don't know wether it's been already fixed or not. But it doesn't happen
with bind.
This topic is been in the list before.

Felix.