Description:

In order for DNS requests destined for a specific domain to be resolved correctly, it is necessary to forward these to a specific DNS server.  

This article describes how DNS forwarding is configured on a LANCOM R&S®Unified Firewall.

Requirements:

• LANCOM R&S® Unified Firewall with LCOS FX as of Version 10.4
• Web browser to configure the Unified Firewall.
  
  The following web browsers are supported:
  • Google Chrome
  • Chromium
  • Mozilla Firefox

Procedure:

1) Setting up DNS forwarding on the Unified Firewall: 

1.1) Connect to the Unifed Firewall via the web browser and go to the menu Network → DNS → General Settings.

1.2) For DNS Servers modify the following parameters and click on the "Plus" symbol to apply the settings:

• Zone: Enter the domain to be resolved. Please note, that the domain always has to be preceded by the wildcard * with a . (*.). 
• Assigned Servers:
  • 1. DNS server: Enter the IP address of the DNS server the DNS requests for the domain should be forwarded to.  
  • 2. DNS server: Optionally you can enter the IP address of a second DNS server.

1.3) Click Save.

2) Enable DNS forwarding to the local domain (optional):

In order for the local domain to be resolved, a forwarding has to be set up for the toplevel domain (in this example *.intern). In doing so all DNS requests with the respective toplevel domain are forwarded.