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If local workstations require connections to the outside world via the modem's
Ethernet interface and your ISP or corporate network administrator requires that
you use a dial-up connection, you must use Point-to-Point Tunneling Protocol
(PPTP). This protocol enables Point-to-Point Protocol (PPP) over an Ethernet
interface.
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Figure 25 provides an overview of the end-to-end network protocol.
Figure 25. Network Protocol Architecture
The dial-up icons you create on the PC allow you to establish connections to your
corporate network or to the Internet via your local ISP. Double-clicking a dial-up
icon establishes a local PPTP tunnel from your PC over your local network to the
modem. The modem terminates this tunnel and relays all traffic inside it to a free
ATM connection or to an ATM connection you select.
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