Motorola Netopia® Advanced Features For Nat; Internal Servers - Motorola 2200 Administrator's Handbook

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:
Internet
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NOTE:
1. The default setting for NAT is ON.
2. Motorola Netopia® uses Port 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 certain 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 services: the internal
Web (HTTP) Port (TCP 80) and the internal Telnet Server Port (TCP 23).

Internal Servers

The internal servers are the embedded Web and Telnet servers of the Gateway. You would change the inter-
nal server ports for Web and Telnet of the Gateway if you wanted to have these services on the LAN using
pinholes or the Default server.
Motorola Netopia® Gateway
WAN
Ethernet
Interface
Embedded Admin Services:
HTTP-Web Server and Telnet Server Port
NAT
NAT-protected
LAN stations
LAN
Ethernet
Interface
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