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DNS Reverse lookup Zones

Shivtek
Shivtek asked
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Last Modified: 2012-05-08
Hey Guys,

I was just wondering whether under DNS running on DC (Server 2003) under reverse lookup zone,

The IP address of the DC needs to be added with the full local hostname?
I have noticed after adding the record once, it wen away.

Is that required?

Also have notices once it goes away, and if I go to nslookup, it tells me that the server is unavailable, once created again, it find the DC. Please guide whats needed.

Also, we are having four servers, one is DC rest dont have AD installed. Under DHCP of DC-scope options: DNS Servers, I see all four servers IP addresses listed, 192.168.1.2, 4, 6, 8

And all clients are getting all four IP in the DNS servers from DHCP.

Is that right. Please guide.

thanks

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Author

Commented:
I just saw in the reverse lookup zones, that 192.168.1.2 i had added for the DC's hostname, is gone again...

Please guide.
Sr. Analyst - System Administrator
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Commented:
Unless the other non-DC servers are running DNS (not very likely), remove them from the list of DNS servers in the DHCP options.  Your network will run better that way !

Author

Commented:
So while editing the NS, when I right click on NS record. Click on properties...in the list, I removed DC.domainname.local and insteat added domainname.local.

Is that right?
Premkumar YogeswaranSr. Analyst - System Administrator
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Commented:
So I leave dc.domainname.local in the list and add another one point to the parent record?
Premkumar YogeswaranSr. Analyst - System Administrator
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Commented:
I did everything you wrote... Just removed the dc.domainname.local fron the ns record list... I will that now...

Author

Commented:
Now when I go nslookup... I see domainname.local with the ip on the bottom... Is that right? Or it should should show dc name?
Premkumar YogeswaranSr. Analyst - System Administrator
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Hello,

Again the the reverse lookup zpne, the IP record for the DC.domanname.local has disappeared.
And when I got to nslookup, I get the IP address and unknown server.

In the forward lookup zone:
I have the following
Data: domainname.local (NS)
Right click properties - 2 records:
1) domainname.local IP 192.168.1.2
2) dc.domainname.local IP 192.168.1.2

Data: DC.domainname.local (NS)
Right click properties - 2 records:
1) domainname.local IP 192.168.1.2
2) dc.domainname.local IP 192.168.1.2

Data: 192.168.1.2 (A)
Data: [3298], DC.domainname.local (SOA)

All (4) above have name: (same as parent folder)

In thje reverse lookup zone:
(same as parent folder) NS   -   DC.domainname.local
(same as parent folder) SOA   -   [344], DC.domainname.local


Please guide and clarify whats wrong here.
Thanks in advance.
Premkumar YogeswaranSr. Analyst - System Administrator
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Commented:
Very few applications actually use the reverse lookup zone.

What is the problem, maybe we can fix it.

You can delete the reverse lookup zone, recreate it and make sure dynamic updates are enabled.

Also, check your server's nic config to make sure it dynamically updates as well.

Author

Commented:
"Instead of creating the record manually in reverse lookup can you check the by creating a record in Forward zone with of the DC.domainname.local by checking PTR which will create the Record automatically in reverse lookup...!"

I did this, and after doing that I could see the server name in the nslookup,  but now I checked nslookup again and it again says unknown server, and in the reverse lookup zone that record is missing...

I am unsure whats the problem.
Chris DentPowerShell Developer
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Commented:

If you are using AD Integrated zones would you confirm:

1. Aging and Scavenging Settings (if configured) for the Reverse Lookup Zone
2. Dynamic Update options for the Reverse Lookup Zone

Are any other records present within the Reverse Lookup Zone (except for NS and SOA)?

If those check out, have you tried deleting and recreating this zone since discovering this problem? Zone corruption is not unheard of. I can provide explicit instructions if required.

Chris

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