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Implementation Notes for All Dial Services
114062 Rev. B 4-3
For PAP, Router A sends an authenticate request to Router B. Router B sends an
authenticate response and then activates the connection. Router B can also initiate
an authenticate request.
Both Router A and B can use PAP and CHAP in a single line pool. If Router B
rejects the CHAP challenge, and Router A has the PAP Fallback parameter
enabled, Router A switches to PAP and reattempts the authentication.
One-Way Authentication
Figure
4-2 illustrates one-way authentication. For CHAP or PAP, the calling
router does not try to authenticate the called router, but it does recognize and
respond to CHAP challenges or PAP authentication requests from the called
router. The called router does authenticate the calling router. Using one-way
authentication, the router can communicate with other devices that may not
support two-way authentication.
Figure 4-2. One-Way Authentication
Router A Router B
Challenge
Response match
Response
One-Way Authentication -- CHAP
Calling router
Called router
(outbound authentication disabled)
Router A Router B
Authenticate-request
Authenticate response
One-Way Authentication -- PAP
Calling router
Called router
(outbound authentication disabled)
DS0031A
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