User guide

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• When NAT is OFF, a Netopia Gateway acts as a traditional TCP/IP router, all LAN com-
puters/devices are exposed to the Internet.
A diagram of a typical NAT-enabled LAN follows:
☛ NOTE:
1. The default setting for NAT is ON.
2. Netopia uses Port Address Translation (PAT) to implement the NAT facility.
3. NAT Pinhole traffic (discussed below) is always initiated from the WAN side.
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 Inter-
net traffic.
WAN
Interface
LAN
Ethernet
Interface
Netopia Gateway
NAT
Internet
Embedded Admin Services:
HTTP-Web Server and Telnet Server Port
NAT-protected
LAN stations
Ethernet