Your posts seems to imply that they are internal DNS servers on your network which you have control over. In which case it is worth checking that there is proper replication between the two DNS servers (i.e. all DNS to Host mappings relating to/pointing to your openser server exist and are identical on both DNS servers). In your situation I guess replication from primary to secondary DNS server in particular.

On 11/01/07, Klaus Darilion <klaus.mailinglists@pernau.at> wrote:

Will Quan wrote:
> I have a primary and secondary dns server setup in resolv.conf, with
> a timeout option of 1 second.The idea is when the primary fails, my
> secondary server picks up the workload.When openser is running, and
> primary dns is down, I am seeing several re-transmissions of 200 OK
> (invite) to my originator *after* openser has finished processing
> ACK. I was thinking the final responses would stop reTX after the ACK
> was t_relayed. Have you seen such behavior? And better yet- Is there
> a solution for this?Thanks, Will

Are you sure this problem is related to DNS failover?

regards
klaus

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Klaus Darilion
nic.at

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