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Implementation Notes for All Dial Services
117353-B Rev. 00
5-3
Figure 5-1. Two-Way Authentication
For CHAP, Router A initiates a CHAP challenge, and Router B responds. Router
A responds with a response match and the connection is activated. Router B can
also initiate a CHAP challenge.
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 Routers 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.
Router A Router B
Authenticate request
Authenticate response
Two-Way Authentication -- PAP
Router A or B can initiate authentication
DS0030A
Challenge
Response match
Response
Router A Router B
Two-Way Authentication -- CHAP
Router A or B can initiate authentication
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