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  • Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 40
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DNS Forward and Reverse Records different

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?
0
Pete
Asked:
Pete
  • 4
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5 Solutions
 
AndyIt ConsultantCommented:
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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PeteAuthor Commented:
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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AndyIt ConsultantCommented:
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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PeteAuthor Commented:
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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AndyIt ConsultantCommented:
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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jmac44Commented:
Are you discarding A and PTR records in IPv4 properties in DHCP?
dhcp.JPG
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PeteAuthor Commented:
setting "always dynamically update.." fixed this.
Thanks
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PeteAuthor Commented:
worked
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