[Samba] Question about DNS Ghost Records

[Gerhard Stein]

I have had an IP Address Record of the name Z37 which was 192.168.2.203. 
Using nslookup I find it, but samba-tool queries the name and shows 0 
Records?

$ nslookup Z37

Server:        192.168.2.1
Address:    192.168.2.1#53

Name:    Z37.calcdom.local
Address: 192.168.2.203



$ samba-tool dns query localhost calcdom.local @ ALL
   Name=, Records=4, Children=0
     SOA: serial=119, refresh=900, retry=600, expire=86400, 
ns=zcontroller.calcdom.local., email=hostmaster.calcdom.local. 
(flags=600000f0, serial=119, ttl=3600)
     NS: zcontroller.calcdom.local. (flags=600000f0, serial=1, ttl=900)
     A: 134.147.57.144 (flags=600000f0, serial=110, ttl=900)
     A: 192.168.2.1 (flags=600000f0, serial=110, ttl=900)
   Name=_msdcs, Records=0, Children=0
   Name=_sites, Records=0, Children=1
   Name=_tcp, Records=0, Children=4
   Name=_udp, Records=0, Children=2
   Name=DomainDnsZones, Records=0, Children=2
   Name=ForestDnsZones, Records=0, Children=2
   Name=Y15, Records=1, Children=0
     A: 192.168.2.192 (flags=f0, serial=110, ttl=1200)
   Name=Y16, Records=1, Children=0
     A: 192.168.2.122 (flags=f0, serial=110, ttl=1200)

....

   Name=Z34, Records=1, Children=0
     A: 192.168.2.169 (flags=f0, serial=110, ttl=1200)
   Name=Z35, Records=1, Children=0
     A: 192.168.2.206 (flags=f0, serial=115, ttl=0)
   Name=Z36, Records=1, Children=0
     A: 192.168.2.205 (flags=f0, serial=116, ttl=0)
   Name=Z37, Records=0, Children=0 < ------------------------
   Name=zcontroller, Records=2, Children=0
     A: 134.147.57.144 (flags=f0, serial=110, ttl=900)
     A: 192.168.2.1 (flags=f0, serial=110, ttl=900)
   Name=Ztest, Records=0, Children=0


Now in order to fix that I tried to delete that record and get this:

$ samba-tool dns update localhost calcdom.local Z37 A 192.168.2.203 
192.168.2.210
Password for [Administrator at CALCDOM.LOCAL]:
ERROR: Record does not exist

I can believe that, but when I try then to add a new record with that name:

$ samba-tool dns add localhost calcdom.local Z37 A 192.168.2.203
Password for [Administrator at CALCDOM.LOCAL]:
ERROR(runtime): uncaught exception - (9711, 
'WERR_DNS_ERROR_RECORD_ALREADY_EXISTS')
   File 
"/usr/local/samba/lib/python2.7/site-packages/samba/netcmd/__init__.py", 
line 175, in _run
     return self.run(*args, **kwargs)
   File 
"/usr/local/samba/lib/python2.7/site-packages/samba/netcmd/dns.py", line 
1053, in run
     0, server, zone, name, add_rec_buf, None)

So, no record, but I cannot add this one...? A bit strange. I did a 
recent update where also the automatic DNS updates got better on the 
other computers.

I'm still trying to remove that record...What works is to add a Record 
with another data:

$ samba-tool dns add localhost calcdom.local Z37 A 192.168.2.210
Password for [Administrator at CALCDOM.LOCAL]:
Record added successfully

But I cannot update or remove the one with the 192.168.2.203:

now both are shown :

$ nslookup z37
Server:        192.168.2.1
Address:    192.168.2.1#53

Name:    z37.calcdom.local
Address: 192.168.2.203
Name:    z37.calcdom.local
Address: 192.168.2.210


Btw. I have no bind installed. I hope you can help, because I have no 
way to remove that record. Can I clear the DNS Cache maybe? How?

Kind Regards,

-- 
M. Sc. Gerhard Stein
Lehrstuhl für Energieanlagen und Energieprozesstechnik (LEAT)
Ruhr-Universität Bochum
Universitätsstraße 150, IC E2/93
D-44780 Bochum
Tel: +49 (0)234 / 32-26333
E-Mail: stein at leat.ruhr-uni-bochum.de