<div>
<div class="content wysiwyg-content">
A client is using example.dyndns.org to point to their public WAN interface which is used for external Exchange access to their Windows 2003 server. However, devices from within their internal network can't use that address to connect to Exchange from within the internal network. What we need to do is setup DNS on the Windows server to point to the internal IP of the server for example.dyndns.org. That way a user can use Exchange on their mobile device without ever changing a setting. I've tried doing that a few ways but it's not working. <br />
<br />
For example:<br />
<br />
Public: example.dyndns.org -&gt; 24.22.22.21<br />
Internal: example.dyndns.org -&gt; 192.168.1.10<br />
<br />
Thanks!
</div>
</div>


A client is using example.dyndns.org to point to their public WAN interface which is used for external Exchange access to their Windows 2003 server. However, devices from within their internal network can't use that address to connect to Exchange from within the internal network. What we need to do is setup DNS on the Windows server to point to the internal IP of the server for example.dyndns.org. That way a user can use Exchange on their mobile device without ever changing a setting. I've tried doing that a few ways but it's not working. 

For example:

Public: example.dyndns.org -> 24.22.22.21
Internal: example.dyndns.org -> 192.168.1.10

Thanks!

Custom Internal IP for DDNS address

The Domain Name System (DNS) is a hierarchical, globally distributed system responsible for associating the name of a computer, service or other resource into an IP address for connecting to the Internet or a private network. Most prominently, it translates domain names to the numerical IP addresses needed for the purpose of computer services and devices worldwide.

Windows Server 2003 was based on Windows XP and was released in four editions: Web, Standard, Enterprise and Datacenter. It also had derivative versions for clusters, storage and Microsoft’s Small Business Server. Important upgrades included integrating Internet Information Services (IIS), improvements to Active Directory (AD) and Group Policy (GP), and the migration to Automated System Recovery (ASR).

Windows Server 2003

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.