Справочное Руководство для Netopia r7100-c

The Netopia R7100 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.

This section covers the following topics:

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Network Address Translation allows communication between the LAN connected to the Netopia R7100 and the 
Internet using a single IP address instead of a routed account with separate IP addresses for each computer on 
the network.

Network Address Translation also provides increased security by hiding the local IP addresses of the LAN 
connected to the Netopia R7100 from the outside world.

With Smar tIP, the setup is simpler, so Internet ser vice providers typically offer internet accounts suppor ting 
Network Address Translation at a significant cost savings.

Network Address Translation (NAT) offers users the following features:

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NAT is selectable on a per connection basis, optionally allowing real addresses to be used for intranet 
connections and proxied addresses to be used for Internet connections.

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The NAT user can use any combination of proxied and unproxied addresses simultaneously on the available 
telco channels. For instance, one unproxied address connection profile can be used to connect to a central 
office, while another proxied address connection profile can simultaneously connect the user’s Netopia 
R7100 and LAN to the Internet.

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The single proxy address is acquired at connection time from the answering side. The address can be 
assigned by the remote router from either a dynamic pool of addresses or a fixed, static address.

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Static NAT Security is simpler and more reliable because only one IP address needs a firewall, and because 
the internal network structure is not visible from the Internet.