Windows DHCP not Updating DNS

Our 2012R2 DC’s do DHCP and DNS for our environment, but I found that our client’s DNS addresses were frequently incorrect, even though DHCP is supposed to update DNS with the correct entry.  Found this blog post that solved our problems:

http://blogs.msmvps.com/acefekay/2009/08/20/dhcp-dynamic-dns-updates-scavenging-static-entries-amp-timestamps-and-the-dnsproxyupdate-group/

Note:  If you are unsure about running the dnscmd shown in the blog post, I found the commands to verify the setting before you change it, and how to revert:

Show current state:

dnscmd /info /OpenACLOnProxyUpdates

Desired state:

dnscmd /config /OpenAclOnProxyUpdates 0

Revert to default:

dnscmd /config /OpenAclOnProxyUpdates 1

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