DNS Failover on Windows Clients

Hi,

We've got multiple domain controllers based at our head office all running AD DS & DNS.

Our Primary domain controller is configured to be the Primary DNS server for our Windows servers and workstations. Recently our primary controller has gone down twice and although we're making our AD infrastructure more resilient can anybody explain why workstations and servers are not failing over to the secondary DNS server specified in their NIC? It appears that they carry on querying the primary DNS server continually despite it not being available

Cheers!
LVL 1
Jack LloydTechnical Services AnalystAsked:
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Miguel Angel Perez MuñozCommented:
DNS resolution first do on primary and secondary if first fails. This causes some lag in case of primary is down (until timeout is reached and query is send to secondary) but DNS must be resolved.
Could you check your computers can reach to secondary DNS and do querys? (you can test using nslookup).
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Jack LloydTechnical Services AnalystAuthor Commented:
Yes they can reach the secondary DNS server and perform DNS look ups. It just doesn't fail over when there's an issue with the main domain controller.

Is there some sort of time out we can set so it can flip onto the secondary domain controller much faster?

Cheers

Jack
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Miguel Angel Perez MuñozCommented:
Timeout is one second: http://support.microsoft.com/kb/2834226

Are you sure is DNS related problem?
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Jack LloydTechnical Services AnalystAuthor Commented:
Hi,

We figured this out in the end, turns out both the servers had been rebooted at the exact same time with some patch management software. One (the  primary) didn't come up cleanly but was still accepting DNS queries, therefore not failing over to the next server.

Thanks for your help though guys.

Jack
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Seth SimmonsSr. Systems AdministratorCommented:
This question has been classified as abandoned and is closed as part of the Cleanup Program. See the recommendation for more details.
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