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DNS Forwarding - Internal and External Domain the same

Last Modified: 2012-05-12

My local domain (company1.local) for example has 2 DNS servers but we also have a parent company who we connect to via a branch office VPN on our firewall.  There is no trust between the domains so for DNS lookups on there network we just add them into our host zone of company1.local.

In the past I tried putting in a DNS forwarder for the head office DNS domain (headoffice.com) and while we could resolve hosts OK, we couldn't email them because there external domain for email was also the same as there internal DNS name so mail just bounced until I removed the forwarder.

How can I get around this?


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