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We have an internal web server which is available through Internet and from local network. The server is located in the local network.

The current configuration is the following:

The main problem is that the local users cannot share links with external users. Thats a problem for us.

I want to setup the following configuration:

Any other suggestion? Which is the best way to override resolution in Windows Server? It can be done on DNS server or it have to be done in hosts file?

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You don't have to mess with DNS. You can tune your gateway.
10. Destination NAT Onto the Same Network

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Yes, it can be done from the internal DNS server. But, please be very caution about the change, the reason to it is the fact that you might have some other systems talking to hosts at zone. Inspect the external zone, copy all the appropriate records from the zone, create a new zone in your INTERNAL DNS server, copy the records to it, you will be required to decide which IP to use, will it be an external IP or internal. Instruct your users to use the new links as required.

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As I understand, I have to copy by hand all the DNS entries for sub-domains , is that right? – FerranB Mar 16 '11 at 0:57
Yep. That's correct. – Vick Vega Mar 16 '11 at 2:13
There should be a better way to overide a single host in windows server dns – JorgeO Sep 4 '12 at 20:41
Such as ...? Example please – Vick Vega Sep 4 '12 at 20:47
I agree with JorgeO - there ought to be a system where the internal DNS is told where the primary/authoritative server is for the zone, and can then be configured with only some domains for internal IPs (instead of having to configure all domains in the whole zone in two places) - unfortunately, you do seem to be stuck with having copies (with selected variances) of the complete zone in two places. – HorusKol Oct 21 '14 at 22:12

If is also your AD domain name this will be an overcomplicated configuration. I would recommend as the easiest fix to setup internally and externally and have everyone use that. If is your AD domain name just create a new DNS A record for www, pointing to the webserver.

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