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.
The domain itself (company) cannot be resolved via such a forwarding entry. To achieve this, a DNS forwarding with the toplevel domain has to be set up (see step 2).
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.
When using multiple domains with the same toplevel domain no distinction between the domains is possible to use different DNS servers!
