Netopia 2200 Manual do Utilizador descarregar pdf (Página 340)

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from routers on networks connected to its WAN interface. In other words, the end com-

puter stations on your LAN are invisible from the Internet.

Only a single WAN IP address is required to provide this security support for your entire

LAN.

LAN sites that communicate through an Internet Service Provider typically enable NAT,

since they usually purchase only one IP address from the ISP.

• When NAT is ON, the Netopia Gateway “proxies” for the end computer stations on your

network by pretending to be the originating host for network communications from non-

originating networks. The WAN interface address is the only IP address exposed.

The Netopia Gateway tracks which local hosts are communicating with which remote

hosts. It routes packets received from remote networks to the correct computer on the

LAN (Ethernet) inter face.

• 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:

WAN

Interface

LAN

Ethernet

Interface

Netopia Gateway

NAT

Internet

Embedded Admin Services:

HTTP-Web Server and Telnet Server Port

NAT-protected

LAN stations

Ethernet

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