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Active Directory domain name conflicts with web server DNS

I took over support for a Windows 2008 domain that was set up by another system administrator. The DNS name of the domain is admin.example.com and a web site is also using the same DNS name. The sysadmin that set up the domain never put it into the corporate DNS server. Our windows domain clients work fine if they use the AD DNS.



We have been getting by for years with no problem. Now I want to set up a trust with the main corporate AD, but I'm worried that it won't work because the corporate AD will be confused since a web server has admin.example.com.




Unfortunately, I cannot replace the admin.example.com DNS record for AD. The website owner is not giving it up.



Anyone have any suggestions on how to get this to work without doing something too hackish. Obviously, the corporate AD could just add DNS records for admin.example.com to point to my domain, but looking for a more elegant solution. Port forwarding didn't work for the website (forward port 80/443 to website, all other traffic to AD for admin.example.com).



Another AD sysadmin suggested that setting DNS records in the corporate DNS as explained in this article : https://support.microsoft.com/en-us/kb/255913



Article seems dated, but it would leave admin.example.com alone for the website and theoretically allow AD servers to work properly with each other and the new corporate AD trust and AD domain clients would continue to work.



The article suggest that following records be added to the corporate bind DNS:




DomainDnsZones.admin.example.com. IN      NS      dc1.admiin.example.com.
DomainDnsZones.admin.example.com. IN      NS      dc2.admin.example.com.
ForestDnsZones.admin.example.com. IN      NS      dc1.admin.example.com.
ForestDnsZones.admin.example.com. IN      NS      dc2.admin.example.com.
_msdcs.admin.example.com.         IN      NS      dc1.admin.example.com.
_msdcs.admin.example.com.         IN      NS      dc2.admin.example.com.
_sites.admin.example.com.         IN      NS      dc1.admin.example.com.
_sites.admin.example.com.         IN      NS      dc2.admin.example.com.
_tcp.admin.example.com.           IN      NS      dc1.admin.example.com.

_tcp.admin.example.com.           IN      NS      dc2.admin.example.com.
_udp.admin.example.com.           IN      NS      dc1.admin.example.com.
_udp.admin.example.com.           IN      NS      dc2.admin.example.com.

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