
Implementation Notes for All Dial Services
308621-14.00 Rev 00
5-5
In Figure 5-3, routers A and B each have a caller resolution table that maps local
circuits to the names of remote callers.
Router A calls router B. When router A makes the call, it places its local CHAP
name, Branch_A, and CHAP secret in the CHAP challenge message. Router B’s
caller resolution table shows Branch_A assigned to Circuit 5, the connection to
router A. When router B receives the call, it looks in its table, confirms
router A’s CHAP name (referred to as the Caller Name in the table) and CHAP
secret, and activates Circuit 5.
Conversely, when router B calls router A, it places its local CHAP name,
Branch_B, in the CHAP challenge message. Router A looks in its table, verifies
that router B is an authorized caller, and brings up circuit 27, the connection to
router B.
PAP is similar to CHAP, but PAP uses a PAP ID and password as part of the
identification process. The calling router places its PAP ID and password in the
authenticate request to the called router. The called router first looks in the caller
resolution table to find the PAP ID (referred to as the Caller Name in the table). If
the router finds the PAP ID, it then checks the table for the password associated
with the ID and compares it to the password in the authenticate request. If the
passwords match, the router brings up the circuit.
To configure the caller resolution table, see Chapter 16, “Customizing Caller
Resolution.” For more information about CHAP names and PAP IDs, see
Configuring PPP Services.
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