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How do you setup L2TP VPN Windows Domain DNS using the Watchguard XTM-25 Web UI?

To setup L2TP VPN Windows Domain DNS using the Watchguard XTM-25 Web UI:
  1. Browse to the Watchguard XTM Web UI.

  2. Click Network.

  3. Click Interfaces.

  4. Below DNS Servers in the DNS Server field, enter the IP Address of the Windows Domain Controller.  Insure this IP Address is the first in the list.

  5. Below this, enter the Primary and Secondary DNS Servers from your ISP.

  6. Click Save. 
When connected to the L2TP VPN, you will have to use the Fully Qualified Domain Name (FQDN) ala host.domain.suffix to access the Computer inside the Windows Domain.  Example: computer01.mydomain.com.  
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