Exchange 2010 internal dns name not resovling

We have 2 locations: primary and secondary(DR).
Exchange servers are located in the secondary(DR) location.
site to site vpn tunnel between primary location and secondary location.
All is well, users are able to get their emails UNTIL we
turn off our isp and switch to our backup ISP through a different firewall.
Internal dns still trying to resolve mail.companyname.com to internal ip, but is unable to since the vpn tunnel is broken. RPC over http or outlook anywhere is not establishing connection to external ip of mail.companyname.com thus we all lose connection to
exchange.
When i manually put in external dns server in my PC (for example: 4.2.2.2), mail.companyname.com resolves and outlook works, but then i am unable to get to my internal devices because now PC is forced to look to external dns.
any idea how i can fix this issue? I want outlook to work when i disconnect primary isp and vpn tunnel and force traffic to go through secondary isp.

Hi,
According to your description, you need to change the configuration of the firewall on your primary site,
let the site can resolve the external ip which the record of mail.companyname.com pointed to.
Thanks.
Niko Cheng
TechNet Community Support

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Hi,
You can refer to the following steps to rebuild an Offline Address Book.
1. Open EMS. Update OAB using the Update-OfflineAddressbook "offline address book" cmdlet. Restart Background Intelligent Transfer Service on the Mailbox server.
2. Initiate OAB replication from mail box server to CAS server. Execute for each CAS server using the Update-FileDistributionService "CASServerName" cmdlet.
3. Start Outlook and download OAB.
What's more, here is an article for your reference.
How to Quickly Rebuild an Exchange 2010 Offline Address Book
http://social.technet.microsoft.com/wiki/contents/articles/7725.how-to-quickly-rebuild-an-exchange-2010-offline-address-book.aspx
Hope this can be helpful to you.
Best regards,
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TechNet Community Support

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Blog:
http://blogs.technet.com/rmilne
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Note: Posts are provided “AS IS” without warranty of any kind, either expressed or implied, including but not limited to the implied warranties of merchantability and/or fitness for a particular purpose.

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