Exchange 2010 DAG not registering in DNS

I 3 exchange 2010 server running Windows Server 2008 R2 and Exchange 2010 Enterprise. Both nods have CAS, Mailbox, Hub Transport roles installed. Nodes 1 and two are on the same subnet node 3 on a remote subnet. The problem that I am having is that the DAG name is not being registered in DNS. I can ping the DAG name “dag-test” but not the FQDN of “dag-test.mail.local”. The DNS guy is says the neither server is trying to register that name. How do we go about troubleshooting this issue?
ghoppAsked:
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Hilal1924Commented:
"The DNS guy is says the neither server is trying to register that name. How do we go about troubleshooting this issue?"
Why don't you create the records manually in DNS , under this Forward Lookup Zone
"mail.local"
Hilal
AkhaterCommented:
first yo need to insure it is not a deeper problem than this

is the computer account dag-test found in Active Directory users and computers /?


if so try nslookup dag-test.mail.local instead of ping

also make sure Dynamic updates is enabled on the mail.local DNS zone.

if it is just a DNS registration issue then creating it manually (like Hillal said) would work
ghoppAuthor Commented:
Yes the name is in AD users and computers.
Dynamic updates are turned on. (We are using a BlueCat DNS Appliance)
We cannot use a manual name because the third node is on a different subnet. This will cause issues if that node becomes the active node for the cluster name.

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AkhaterCommented:
Honestly you don't have to worry about it DAG names aren't really used, not even by the DAG itself. Each CAS talks to directly to the corresponding mailbox server, you can take down the cluster name resource and DAG won't stop working. (I am not saying you should do it but just it is possible)

Just register it manually
ghoppAuthor Commented:
I get an error when I try to add the remote server to the DAG that it cannot see “dag-test.mail.local”.
AkhaterCommented:
did you try to add it to the DNS ?
ghoppAuthor Commented:
We cannot use a manual name because the third node is on a different subnet. This will cause issues if that node becomes the active node for the cluster name.

It looks like I need to figure out why the server is not automatically adding the name to DNS. In my lad setup it does that without any problems.
ghoppAuthor Commented:
The DNS lookup for the the DAG name "dag-test.mail.local" come back as un resolvable.
Mino DCCommented:
In each Active Directory site where you plan to install Exchange 2010, you must have at least one global catalog server running any of the following:

Windows Server 2003 Standard Edition with SP1 or later (32-bit or 64-bit)

Windows Server 2003 Enterprise Edition with SP1 or later (32-bit or 64-bit)

Windows Server 2008 Standard or Enterprise (32-bit or 64-bit)

Windows Server 2008 R2 Standard or Enterprise
ghoppAuthor Commented:
We found this solution.

http://support.microsoft.com/kb/977158

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Mino DCCommented:
but are You using a third-party DNS server application for DNS updates ?
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