Netopia R310 사용자 설명서

The Netopia R310 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. For a detailed discussion of 
Network Address Translation, see 

how to use the Network Address Translation feature of Smar tIP.

Note: When you configured your Netopia R310 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 of mapping one or more IP addresses and/or IP ser vice por ts 
into different values. This mapping ser ves two functions:

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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.

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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 term mapping refers to rules that associate one or more private addresses on the Netopia R310’s LAN to 
one or more public addresses on the Netopia R310’s WAN inter face (typically the Internet).

The terms private and internal refer to addresses on the Netopia R310’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 R310 unless specifically configured other wise. 

The terms public and external refer to the WAN (or Internet) side of the Netopia R310.