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DNS Forward and Reverse Records different

Posted on 2016-11-17
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Last Modified: 2016-11-25
Win2012 r2 DC with DNS
DNS is AD integrated
500 x win7 computers

On the occasional computers DNS entry  I have noticed the Forward and Reverse Records are different
ie:
ping computername = replies with its real IP
the IP in the reverse zone is not as above.

what can cause this?
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Question by:Pete
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8 Comments
 
LVL 7

Assisted Solution

by:Andy
Andy earned 1000 total points
ID: 41891498
Hi Pete,

If these are DHCP addresses, maybe look at seting up DNS scavenging to clear out old records as addresses change.

The following guide should assist:
https://technet.microsoft.com/en-us/library/ff807390(v=ws.10).aspx
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LVL 1

Author Comment

by:Pete
ID: 41891501
I already have scavenging enabled for every 5 days. it runs fine.

I have noticed in DHCP the IP of the computer in question is the same as the (incorrect) reverse lookup.
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LVL 7

Assisted Solution

by:Andy
Andy earned 1000 total points
ID: 41891505
OK, can you check 'Use this connection's DNS suffix in DNS registration' in the TCP/IP settings of the network interface is set for any PC's with the issue?

Also, is "update associated pointer (PTR) record" ticked in the Forward Lookup Zone?
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LVL 1

Author Comment

by:Pete
ID: 41891516
I am reluctant to make changes to individual workstations, do you not think it is a config issue somewhere in DNS or DHCP server? or is this just troubleshooting?
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LVL 7

Assisted Solution

by:Andy
Andy earned 1000 total points
ID: 41891520
If it's not all clients then could be client issue was my thinking behind that.

You could also check the DNS dynamic updates registration credentials in the Advanced tab of your DHCP server properties.
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LVL 9

Assisted Solution

by:jmac44
jmac44 earned 1000 total points
ID: 41891549
Are you discarding A and PTR records in IPv4 properties in DHCP?
dhcp.JPG
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LVL 1

Accepted Solution

by:
Pete earned 0 total points
ID: 41895586
setting "always dynamically update.." fixed this.
Thanks
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LVL 1

Author Closing Comment

by:Pete
ID: 41901388
worked
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