Справочное Руководство для Netopia 430 s

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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 two B-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 ISDN Router 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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Security is made simpler and more reliable by only having to 
firewall one IP address and by obscuring the internal network 
structure from the Internet.

Follow these steps to use NAT. 

1.

Pick a network number for your local (internal) network. This 
can be any IP address range you want. For this example, we will 
use 10.0.0.0.

Note: The outside world (the external network) will not see this 
network number.

2.

Using the internal network number, assign addresses to the 
local nodes on your LAN. For example, you may assign

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10.0.0.1 to your Netopia ISDN Router

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10.0.0.2 to a node running as a World Wide Web ser ver

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10.0.0.3 to an FTP ser ver

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10.0.0.4 to a Macintosh computer