5-7
Advanced Setup
5.4 NAT Setup
Usually you will use the router as a NAT-enabled router. NAT stands
for Network Address Translation. It means the router gets one (in
Single ISP, PPPoE, PPTP) or two (in Dual ISPs mode) globally re-
routable IP addresses from the ISP. Local hosts will use private network
IP addresses defined by RFC-1918 to communicate with the router.
The router translates the private network addresses to a globally routable
IP address that is then used to access the Internet. The following
explains NAT features for specific applications.
Click "
NAT Setup
" to open the setup page. On the page you will see
the private IP address definitions defined in RFC-1918. Usually we
use the 192.168.1.0/24 subnet for the router.
5.4.1 Exposing Internal Servers to the Public Domain
The Port Redirection Table may be used to expose internal servers to
the public domain or to directly assign a specific port number to internal
hosts. External hosts or domain can specify port numbers to access
internal network services, such as FTP, WWW, etc.
The following example shows how an internal FTP server is exposed
