Your XTM device shares Windows Internet Name Server (WINS) and Domain Name System (DNS) server IP addresses for some features. These features include DHCP and Mobile VPN. The WINS and DNS servers must be accessible from the XTM device trusted interface.
This information is used for two purposes:
Mobile VPN clients use only the first two DNS servers.
Make sure that you use only an internal WINS and DNS server for DHCP and Mobile VPN. This is to make sure that you do not create policies with configuration properties that make it difficult for your users to connect to the DNS server.
The XTM device uses the WINS and DNS servers that you configure here unless you configure a different WINS/DNS server elsewhere.
About Network Interface Setup
Common Interface Settings