
Configuring Dial Services
5-2
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CHAP and PAP implement a security feature that identifies peer routers to one
another. CHAP is the default authentication protocol.
Enabling the called router to dynamically identify the calling router lets a single
dial interface (ISDN or modem) at a remote router be the connection point to
multiple routers.
To set up authentication, you must configure the router’s caller resolution table
(see Chapter 14 “Customizing Caller Resolution”). For more information about
CHAP and PAP, see Configuring PPP Services.
Types of Authentication
You can configure one-way authentication or two-way authentication. Two-way
authentication enables both routers to authenticate each other. One-way
authentication enables only the called router to authenticate the remote peer.
Two-Way Authentication
Figure 5-1
shows an example of two-way authentication.
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