Avaya Configuring PPP Services Bedienungsanleitung PDF herunterladen (Seite 35)

PPP Concepts

117360-A Rev. A 2-9

One-Way Authentication

One-way authentication uses an authentication protocol on only one side of a

dial-up connection. The router placing the call disables the authentication protocol

for a circuit, while the router on the receiving side enables authentication.

Disabling the outbound authentication lets the router interoperate with other

devices that may not allow two-way authentication or support CHAP.

The receiving router can use both PAP and CHAP in the same line pool. When the

router receives a call, it authenticates using the user-conﬁgured protocol. If the

calling router rejects the authentication protocol CHAP, the receiving router

switches to PAP.

One-way authentication requires that PAP and CHAP be enabled in the same line

pool. Set the PPP Local Authentication Protocol parameter to CHAP and enable

PAP Fallback. You must also conﬁgure certain options for the switched circuit

itself. See Conﬁguring Dial Services for a description of how you must set up dial

services to enable one-way authentication.

Negotiating Network Layer Protocols

PPP uses various network control protocols to determine the values of parameters

during network layer negotiations, the ﬁnal phase of PPP initialization. Like the

LCP, each network control protocol allows peer routers to negotiate various

network options over the data link by transmitting conﬁgure-request,

conﬁgure-ACK, conﬁgure-NAK, and conﬁgure-reject packets.

Network options include which network addresses to use and which media types

to bridge. Once both peer routers agree upon network options, the network control

protocol reaches the open state. The routers then begin transmitting user data

packets for any upper-layer protocols over the link.

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Avaya Configuring PPP Services Bedienungsanleitung Seite 35