ARRIS Group Inc. 224762 Manual Do Utilizador

When NAT is 

OFF, a Motorola Netopia® Gateway acts as a traditional TCP/IP router, all LAN computers/

devices are exposed to the Internet.

A diagram of a typical NAT-enabled LAN follows:

 

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1. The default setting for NAT is 

ON.

2. Motorola Netopia® uses Por t Address Translation (PAT) to implement the NAT facility.
3. NAT Pinhole traffic (discussed below) is always initiated from the WAN side.

Using the NAT facility provides effective LAN security. However, there are user applications that require 
methods to selectively by-pass this security function for cer tain types of Internet traffic.

Motorola Netopia® Gateways provide special pinhole configuration rules that enable users to establish 
NAT-protected LAN layouts that still provide flexible by-pass capabilities.

Some of these rules require coordination with the unit’s embedded administration ser vices: the internal 
Web (HTTP) Por t (TCP 80) and the internal Telnet Ser ver Por t (TCP 23). 

The internal ser vers are the embedded Web and Telnet ser vers of the Gateway. You would change the inter-
nal ser ver por ts for Web and Telnet of the Gateway if you wanted to have these ser vices on the LAN using 
pinholes or the Default ser ver.

WAN

 

Interface

LAN

Ethernet

 

Interface

NAT

Internet

Embedded Admin Services:

HTTP-Web Server and Telnet Server Port

NAT-protected

LAN stations

Ethernet