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PeteFlag for United Kingdom of Great Britain and Northern Ireland

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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?
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Andy

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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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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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worked