On Tue, May 24, 2011 at 7:42 AM, Oliver Marshall
<[email protected]> wrote:
> Is there a way to override a DNS entry in an AD zone at one site only?

  Not that I'm not aware of.

> A new site has been taken on which has VPN but it’s intermittent and we need
> to point myserver.mydomain.co.uk to the external IP address.

  I think this should work:

1. Create stand-alone DNS server(s)
2. Create a new Standard Primary zone <myserver.mydomain.co.uk.> on #1
3. Create an A record in #2 for <myserver.mydomain.co.uk.> with the
public IP address
4. Configure #1 to forward to your existing DNS server(s) with the
AD-integrated zone
5. Configure all clients at the site in question to use only #1 for
their DNS servers

  The above creates an undelegated zone, splitting the DNS namespace.
By pointing the clients at the #1 server, they will get answers for
said zone.  Nobody else will be aware of the zone because it's
undelegated.  Aside from SOA and NS, there will be only one record
(the A record), and there will be only the one name, but that's okay.

  I believe you need to create a stand-alone DNS server because MS-DNS
only supports a single namespace per instance and only allows one
instance per server.  If you create the #2 zone on the same server as
the one hosting your AD-integrated zone, I believe the AD-integrated
zone will take precedence (because there's no delegation).  I could be
wrong on that; I suppose you could try creating #2 on your existing
DNS servers at that site.

  For the record: This is yet another example of why mixing public and
private names and addresses is a bad idea.  :)

-- Ben

~ Finally, powerful endpoint security that ISN'T a resource hog! ~
~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/>  ~

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