Multilink Ppp Support; Tcp/Ip Support; Ip Address Masquerading By Dynamic Nat; Port Forwarding With Nat - NETGEAR RT338 Reference Manual

Reference Guide for the Model RT338 ISDN Router

Multilink PPP Support

When the single-channel ISDN line utilization exceeds a configurable threshold, the router can
automatically establish an additional ISDN call to provide additional bandwidth. During heavy
traffic, the two 64 Kbps B channels are combined using Multilink PPP to provide a fast 128 Kbps
pipe. When traffic slows down, one of the B channels is idled to save toll charges. The router also
reverts back to one B channel for data when an analog port is used.

TCP/IP Support

The Model RT338 router supports the Transmission Control Protocol/Internet Protocol (TCP/IP)
and Routing Information Protocol (RIP), which ensures that ISDN connections are established
only when passing data.
For further information about TCP/IP, refer to "Basic Router Concepts" on page 1-6.

IP Address Masquerading by Dynamic NAT+

The Model RT338 router lets several networked PCs share an Internet account using only a single
IP address, which may be statically or dynamically assigned by your Internet service provider
(ISP). This technique, an extension of Network Address Translation (NAT), is also known as
IP address masquerading. It lets you use an inexpensive single-user ISP account.

Port Forwarding with NAT

Although NAT prevents Internet locations from directly accessing the PCs on the LAN, the router
lets incoming traffic be forwarded to specific PCs based on the service port number of the
incoming request.

Automatic Configuration of Attached PCs by DHCP

The Model RT338 router dynamically assigns network configuration information, including
IP, gateway, and domain name server (DNS) addresses, to attached PCs on the LAN using the
Dynamic Host Configuration Protocol (DHCP). This feature greatly simplifies configuration of
LAN-attached PCs.
1-4 Introduction