Reference Guide

Multiple Network Address Translation (MultiNAT) 11-1

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The Netopia R6000 Series offers advanced Multiple Network Address Translation functionality.

You should read this chapter completely before attempting to conﬁgure any of the advanced NAT features.

This chapter covers the following topics:

■ Overview on page 11-1

■ MultiNAT Conﬁguration on page 11-7

■ Basic conﬁguration – Easy Setup Proﬁle on page 11-7

■ Advanced conﬁguration – Server Lists and Dynamic NAT on page 11-8

■ Adding Server Lists on page 11-18

■ Binding Map Lists and Server Lists on page 11-24

■ NAT Associations on page 11-28

■ MultiNAT Conﬁguration Example on page 11-30

■ Firmware Upgrades and NAT on page 11-34

Overview

NAT (Network Address Translation) is a means of mapping one or more IP addresses and/or IP service ports

into different values. This mapping serves two functions:

■ It allows the addresses of many computers on a LAN to be represented to the public Internet 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 term mapping refers to rules that associate one or more private addresses on the Netopia Router’s LAN to

one or more public addresses on the Netopia Routers WAN interface (typically the Internet).

The terms private and internal refer to addresses on the Netopia Router’s LAN. These addresses are

considered private because they are protected or obscured by NAT and cannot be directly accessed from the

WAN (or Internet) side of the Netopia Router unless speciﬁcally conﬁgured otherwise.

The terms public and external refer to the WAN (or Internet) side of the Netopia Router.