NAT allows substituting the real address in a packet with a mapped address that
is routable on the destination network. By clicking the help icon in this field, you
can display the IP Forwarding option, if your network requires it.
These settings allow you to specify the information required in order to
communicate on the Internet via a fixed Internet IP address. The information is
typically determined by and can be obtained from the ISP.
Each ISP may provide a set of DNS servers for DNS lookups. This setting
specifies the DNS (Domain Name System) servers to be used when a DNS
lookup is routed through this connection.
Selecting Obtain DNS server address automatically results in the DNS servers
being assigned by the WAN DHCP server to be used for outbound DNS lookups
over the connection. (The DNS servers are obtained along with the WAN IP
address assigned from the DHCP server.
When Use the following DNS server address(es) is selected, you may enter
custom DNS server addresses for this WAN connection into the DNS Server 1
and DNS Server 2 fields.