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How you configure a permanent PPP connection depends on the following decisions:
These configuration decision topics are covered in the following sections:
The following sections describe the two types of permanent PPP connections you can make.
In a permanent connection over a synchronous leased-line interface, a leased line is used for the physical connection between the separated LANs. There is no cost savings for disconnecting the link because the service provider of a leased line charges a fixed cost.
The bandwidth of a leased line usually ranges from about 56 Kbps to 2.048 Mbps, which is much less than that of a LAN. However, this bandwidth is usually sufficient because not all the traffic that occurs on a LAN needs to be routed across a WAN.
To configure this kind of connection, refer to How to Configure a Permanent PPP Data Link over a Synchronous Leased-Line Interface.
In a permanent connection over a dial-up line interface, a modem is configured to keep the permanent connection active. If the connection goes down, the modem reestablishes the connection.
To configure this kind of connection, refer to How to Configure a Permanent PPP Data Link over a Dial-Up Line Interface.
You should choose the transport that will best serve the needs of your NetWare® Link/PPPTM connection.
Voice-grade telephone lines can be used to establish low-bandwidth (typically 2,400 bps to 28,800 bps) permanent connections. Integrated Services Digital Network (ISDN) lines can be used to establish medium-bandwidth (56/64 Kbps to 112/128 Kbps) permanent connections. Depending on bandwidth requirements, permanent connections over Public Switched Telephone Network (PSTN) lines can be a simple and quick way to maintain connectivity between remote LANs.
If low-bandwidth connections do not suffice, you can consider a switched data service, such as switched/56 or switched/256. Switched services can offer significant cost savings over dedicated circuits with the same bandwidth.
Note that although synchronous interfaces operating over ISDN lines are a viable solution for your permanent connection needs, this kind of solution might not be as cost-efficient as other alternatives, depending on the service provider rates for permanent ISDN lines in your area.
To configure a connection over an ISDN line, refer to How to Configure a Permanent PPP Data Link over an ISDN Interface.
To provide protection against unauthorized router access, the PPP specification defines two optional protocols that authenticate inbound call attempts: the Password Authentication Protocol (PAP) and the Challenge Handshake Authentication Protocol (CHAP). These protocols ensure that the local system can accept calls from only authorized remote systems. Authentication is based on a remote system identified by a user ID and a password.
With NetWare Link/PPP, you can configure each interface to support one of the following methods for inbound call authentication:
The main difference between PAP and CHAP is that PAP sends the password string across the WAN in clear text, whereas CHAP is a more secure authentication protocol because it uses the password to encrypt a challenge string. Note, however, that not all PPP products currently support CHAP authentication.
For more information about NetWare Link/PPP and call authentication, refer to Understanding.
For users or systems dialing up and logging in to asynchronous service providers, login scripts facilitate the process by defining a command/response dialog that takes place between a router and a remote server at dial-up. According to syntactical conventions, certain login script strings are interpreted as output to be sent by the router (a command to the remote server), whereas others are interpreted as input to be listened for by the router (an expected response from the remote server).
NetWare Link/PPP provides a login script for logging in to a network. For information about customizing a login script to meet your site's needs, refer to Customizing PPP Login Scripts.
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