Chapter 5. Configuring WAN Interfaces
59
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The Point-to-Point Protocol (PPP) is one of several protocols used
to enable communication between ISPs and their customers. PPP
handles tasks such as the following:
Identify the type of service the ISP should provide to a
given customer
Identify the customer to the ISP through a username and
password login
Enable the ISP to assign an Internet address and other IP
information to the customer’s DSL modem
PPP can be used only when your connection with your ISP is a
routed connection (i.e., it cannot be used for bridged connections).
For more information on bridged and routed connections, see
Chapter 6, “Configuring the System Operating Mode.”
A PPP interface can be either of two types: PPP over ATM (PPPoA)
and PPP over Ethernet (PPPoE). Although to the end user they
function similarly, the ISP’s network may be configured to handle
only one protocol type. Furthermore, an ISP may not use the PPP
protocol at all, instead offering EoA-type connections (described on
page 65). Contact your ISP before changing the preconfigured
WAN interface type.
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To view your current PPP setup, log into Configuration Manager,
click the WAN tab, and then click
in the task bar.
The Point to
Point Protocol (PPP) Configuration page displays:
Figure 17. Point to Point Protocol (PPP) Configuration Page
A PPP interface is configured as a group of software settings
associated with an ATM VC interface. Each PPP interface is given
a name, such as ppp-0, ppp-1. Users typically need only one PPP
interface; in some cases, multiple interfaces are created to allow the
user to log on to more than one account with the ISP.)
