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DNS for 2 NT domains help. Should

DNS for 2 NT domains help. Should

DNS for 2 NT domains help. Should

(OP)
DNS for 2  NT domains help.
The question is
Should we have a primary DNS in each domain or is it better to have 1 primary DNS in one domain and the secondary DNS in the other, both serving the two domains.

Thanks in advance people

RE: DNS for 2 NT domains help. Should

In part, your answer might depend on where these domains are physically located and who will be administering DNS for the specific domain.  Either solution will work, it is just a matter of fine tuning it to your needs.

RE: DNS for 2 NT domains help. Should

(OP)
Thanks Ntr0P for responding quickly. The two domains are 80km apart and connected by a frame-relay line CIR 256.
The main thing is I'm not sure if my forwarders are working correctly.
When I arrived here there was a DNS forwarder address which was pointing our main office(domain3) this again connected through a F-Relay 512. This meant if this line went down, and this is obviously managed by a third party, that we would not have any DNS resolution for some applications ie FTP doesn't use any resolution other than this main office DNS server. If I take off the DNS from the list it doesn't work.
Our Proxy uses 2 external DNS for the internet and this works fine for domains1+2.
Presently I created a secondary DNS server in let's say Domain2 copying most of the zones on DNS server domain1. After tuning these to reduce errors it seems to work fine for all internel requests.  
The question is how to solve this single point of failure for FTP.

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