DNS Redundancy - Backup to my authoritative DNS server

DNS Redundancy

In NOC A I have a web server and an authoritative DNS server.  
In NOC B I have a backup web server.

The authoritative DNS server has 2 WAN links on it.  If one WAN goes down, it serves out the IP address of the secondary WAN connection.

How can I configure my DNS so that if a) the DNS servers dies or b) or both WAN links go down, our domain is resolved to NOC B and the backup web server?

Thanks
Wes
wskorskiAsked:
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wskorskiAuthor Commented:
How about using a service like everydns.net

If I understand you correctly, at the registrar I would would have the first entry point to NOC A dns server, the 2nd entry point to everydns.net (or NOC B DNS server)?

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DanielWillmottCommented:
Is this a Windows environment? (Windows DNS?)
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DanielWillmottCommented:
And is this for name resolution inside a network or for an internet domain?
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wskorskiAuthor Commented:
Yes, it is a Windows environment.  
It is for internet domain.
The DNS device is a dual WAN Peplink router with authoritative DNS built-in.
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DanielWillmottCommented:
The easiest thing would be to add another DNS server (service) at NOC B and create a secondary NS record for your domain pointing to it.
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DanielWillmottCommented:
Yes - correct. That would take any reliance off of NOC B.
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