SnapGear VPN Router User Manual page 54

If your SnapGear VPN Router is configured for a Direct Connection to the Internet, you must also
set the IP address for the Internet Interface. Check DHCP assigned if the IP address of the Internet
Interface is set via a DHCP server, or enter the IP Address and Netmask if you have a static
address for the Internet interface.
Enter the IP address of default gateway in the Internet Gateway field. The SnapGear VPN Router
will send all packets not destined for the local network to this machine.
Enter the IP address of the DNS Server, which the SnapGear VPN Router will use to resolve
domain names, into the Domain Name Server field. This should only be required if the SnapGear
VPN Router is configured with a static IP address on the Internet interface and therefore doesn't
receive its DNS server address automatically.
The SnapGear VPN Router can be configured to run as a Domain Name Server. The SnapGear VPN
Router acts as a DNS proxy and passes incoming DNS requests to the appropriate external DNS
server. If this is enabled, all the computers on the LAN should then specify the SnapGear VPN
Router's IP address as their DNS server.
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Network Configuration