Multiple Network Address Translation and IP Setup
Chapter 10
Multiple Network Address Translation and IP Setup
The Netopia R2020 uses Internet Protocol (IP) to communicate both locally and with remote networks. This chapter shows you how to configure the Router to route IP traffic. You also learn how to configure the Router to serve IP addresses to hosts on your local network.
Netopia’s SmartIP features IP address serving and Network Address Translation. This chapter describes how to use the Network Address Translation feature of SmartIP and Multiple Network Address Translation (MultiNAT).
Note: When you configured your Netopia R2020 using SmartStart, Network Address Translation was enabled by default. You have the option of disabling it, if you wish. This is done through the System Configuration screens using
This section covers the following topics:
■“Overview” on page
■“NAT configuration” on page
■“Binding Map Lists and Server Lists” on page
■“NAT Associations” on page
■“MultiNAT Configuration Example” on page
■“IP subnets” on page
■“Static routes” on page
■“IP address serving” on page
Overview
NAT (Network Address Translation) is a means whereby one or more IP addresses and/or IP service ports are
■It allows the addresses of many computers to be represented by only one or a few addresses, saving you money.
■It can be used as a security feature by obscuring the true addresses of important machines from potential hackers on the Internet.
To help you understand some of the concepts discussed here, it may be helpful to introduce some NAT terminology.
The terms mapping or remapping refer to rules that translate one or more addresses on the Netopia Router's LAN to another address or addresses on the other side of the Netopia Router's WAN link (typically the Internet).
The terms private and internal refer to addresses on the Netopia Router's LAN network that are protected or obscured from the NAT remappings. These NATed addresses cannot be seen from the Internet side of the Netopia Router's WAN connection.
