Справочник Пользователя для Netopia R2020

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 
ser ve IP addresses to hosts on your local network.

Netopia’s Smar tIP features IP address ser ving and Network Address Translation. This chapter describes how to 
use the Network Address Translation feature of Smar tIP and Multiple Network Address Translation (MultiNAT).

Note: When you configured your Netopia R2020 using Smar tStar t, 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 Console-based Management.

This section covers the following topics:

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NAT (Network Address Translation) is a means whereby one or more IP addresses and/or IP ser vice por ts are 
re-mapped into other values. This aliasing ser ves two functions:

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It allows the addresses of many computers to be represented by only one or a few addresses, saving you 
money.

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It can be used as a security feature by obscuring the true addresses of impor tant 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.