Motorola Netopia 3342N - Manual (Page 355)

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• 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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NOTE:
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.
Motorola Netopia® Advanced Features for NAT
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).
Internal Servers
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
Motorola Netopia® Gateway
NAT
Internet
Embedded Admin Services:
HTTP-Web Server and Telnet Server Port
NAT-protected
LAN stations
Ethernet