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Can I prevent a site from caching DNS on certain machines?

Here's the situation, we have a satellite office in which I set up an ISP failover for whenever the primary goes down. THe primary ISP has a VPN connection to our main office, but the backup ISP does not.

Our homepage is set to an internal SharePoint site, that works fine when the primary is up, but defaults to our external SharePoint interface when the backup ISP is running and requires login credentials.

This is fine, since it's expected. However, what happens sometimes is that it'll cache the external IP in IE even though the VPN is up and primary ISP is active, it won't default to automatically accessing the internal IP and loading SharePoint.

Eventually it resolves itself later in the day, but short of waiting, or telling a user to flush their DNS, is there a better way to ensure it uses the internal IP whenever appropriate?

Hope this made sense. Thanks.
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ruhkus
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ruhkus
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Krzysztof PytkoSenior Active Directory EngineerCommented:
The only way (in my opinion) is shortening TTL of DNS records in your DNS zone. Then it will be cleared from local DNS cache faster. In DNS management console, in zone's properties on "SOA" tab you will find TTL settings, change thmen from 1 hour to 30-20 minutes. But remember it will increase DNS queries traffic in your network.

Regards,
Krzysztof
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ruhkusAuthor Commented:
Hmm, so there isn't anything in group policy perhaps that could address this? I was thinking that maybe adding it to a trusted zone, or something along those lines would help?
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ruhkusAuthor Commented:
I was hoping for a solution to adderess a single site.

Thanks for your help.
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