Configuring For Local Servers With Nat - NETGEAR RT338 Reference Manual

Reference Guide for the Model RT338 ISDN Router
Use the space bar to make a selection in the Multilink field.
8.
This field determines under which circumstances the router places an additional call (adding a
second ISDN B channel) to the ISP in order to increase the bandwidth of the connection.
The following three options are available for this field:
• Off—The router places only a single channel call to the ISP.
• BOD—The router adds bandwidth on demand (BOD), placing a second call when the data
rate increases beyond a specified level for a specified period. You can change these
parameters using the Edit PPP submenu of Menu 11 - Remote Node Setup Menu.
• Always—The router always calls the ISP using both channels for a 128K connection.
Press [Enter] at the Press ENTER to Confirm... prompt to confirm your selections.
9.
You can also press [Esc] at any time to cancel your selections.
The Manager asks if you want to test the Internet connection. If you select Yes, the router calls
the ISP to test the Internet connection. If the test fails, note the error message that you receive
and take the appropriate troubleshooting steps.

Configuring for Local Servers with NAT

Although NAT causes your entire local network to appear as a single machine to the Internet, you
can make local servers for different services (for example, FTP or HTTP) visible and available to
the Internet. Requested services are identified by port numbers in the incoming IP packet.
For example a packet that is sent to the external IP address of your router and destined for port
number 80 is an HTTP (Web server) request, and port 21 is an FTP request. Examples of port
numbers are shown at the bottom of Menu 15, although you are not limited to these choices.
See the IETF's RFC1700, "Assigned Numbers" for port numbers for common protocols.
Use Menu 15, SUA Server Setup to configure the router to forward incoming protocols to
IP addresses on your local network based on the port number. In addition to servers for specific
protocols, you can also specify a default server to which all other incoming protocols are
forwarded.
6-4 Using the Manager Interface to Configure Internet Access