Apple IP (AppleShare IP) Gateway - Manual (Page 15)

The Apple IP Gateway and the Apple Internet Router
AppleTalk/IP Wide Area Extension
Although it is easy to confuse the Apple IP Gateway and Apple Internet
Router AppleTalk/IP Wide Area Extension, the two software programs
actually provide two completely different services.
The Apple IP Gateway allows Macintosh computers on an AppleTalk network
to communicate with computers of many different types on an IP network. The
AppleTalk/IP Wide Area Extension allows Macintosh computers on an
AppleTalk network to communicate with other Macintosh computers on
another AppleTalk network located, figuratively speaking, on the other side of
an IP internet.
The extension is based on a software file called IPTunnel, so named because it
builds a tunnel between the two AppleTalk networks through the IP internet.
Because IP internets span the globe, the AppleTalk/IP Wide Area Extension
provides a fast, powerful, and cost-effective way for widely separated local-
area AppleTalk networks to link up. The extension does not, however, provide
access to IP services. That is the job of the Apple IP Gateway. The two
programs can run on a single computer, offering users the full potential of
both. Figure 3 shows their capabilities in graphic form.
How the gateway can be used 7