
Configuring Dial Services
3-10
Figure 3-4. Router A Calls Router B Using CHAP
PAP is similar to CHAP; however, 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 message to the called router. The called router first looks at
the resolution table to find the PAP ID. 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 message. If the passwords match, the router
brings up the circuit.
To configure the caller resolution table, refer to Chapter 7. For more information
about CHAP names and PAP IDs, see Configuring PPP Services.
Note: The lines in a line pool must all use the same authentication protocol.
You cannot have a pool with one line using CHAP and another line using PAP.
Router A
Router B
Router C
Circuit 5
Circuit 27
Circuit 13
CHAP Name: Branch C
CHAP Name: Branch B
PPP Link between Router A and Router B
Branch_C 13
Router A
Caller Resolution Table
Branch_B 27
Router B
Caller Resolution Table
Branch_B 5
Dial
Device
Dial
Device
Dial
Device
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