How to "mirror" DNS servers?

Hi, I've got a domain controller and I'd like to add a non-DC DNS server to the domain to act as a backup DNS server. Is there a way to set it up so that DNS is replicated across two DNS servers so that when one goes down the other is an exact duplicate of the other? How is this usually done?
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PugglewuggleAsked:
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LauraEHunterMVPCommented:
Is your existing DNS AD-integrated? If so, and if the new server is a non-domain controller, you will need to configure a secondary zone on the 2nd server, and configure the 1st DNS server (the DC) to allow zone transfers to the IP address of the new server.  You will then need to configure your client computers to use the DC as their preferred DNS server and the member server as the alternate DNS server.

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PugglewuggleAuthor Commented:
Yes, the existing zone is the domain and forest root zone.
When I add the second server to the nameservers tab of the first server I get a message saying server 2 is not authoritative... any ideas?
Does the second server continue existing as a secondary server or do I promote that to a primary server? Also, how often do the zone transfers (aka replication) occur?
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LauraEHunterMVPCommented:
Server2 will not be authoritative for the zone until at least one full zone transfer has completed.

Server2 will remain a secondary server; given that you are using AD-integrated DNS, there is no way to configure it as a primary server in your current configuration unless you configure it as an additional DC for the domain. In Server 2003 and higher, the primary server (in this case the domain controller) will notify the secondary server when it has changes that need to be replicated. When the secondary server receives this notification, it will initiate a zone transfer from the primary server.
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PugglewuggleAuthor Commented:
Do I need to do this with the _msdcs zone too? What about the reverse lookup zones?
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PugglewuggleAuthor Commented:
Also, do I need to manually configure updates notifications with the Notify button on the Zone Transfers tab for the zone?
And is there any way to replicate an entire server so I don't have to configure zone transfers for each one seperately?
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PugglewuggleAuthor Commented:
Oh, and how often do the notifications take place? I just setup the notifications and the updated records weren't sent to the secondary server until I initiated a manual transfer.
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LauraEHunterMVPCommented:
> Do I need to do this with the _msdcs zone too? What about the reverse lookup zones?

If you wish to have redundancy for these zones, then yes. (Though if you only have 1 DC, creating a secondary zone for the _msdcs zone won't actually accomplish anything in this scenario.

> Also, do I need to manually configure updates notifications with the Notify button on the Zone Transfers tab for the zone?

Yes. Instructions to do so can be found here: http://technet.microsoft.com/en-us/library/cc759426.aspx

> And is there any way to replicate an entire server so I don't have to configure zone transfers for each one seperately?

No.

> Oh, and how often do the notifications take place? I just setup the notifications and the updated records weren't sent to the secondary server until I initiated a manual transfer.

You need to configure the Notify settings on the Zone Transfers tab, using the link above.


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PugglewuggleAuthor Commented:
Thanks!
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