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Configuring Dial Services
4-4 114062 Rev. B
The receiving router can use PAP and CHAP in a single line pool. If Router A
rejects the CHAP challenge, and Router B has the PAP Fallback parameter
enabled, Router B switches to PAP and reattempts authentication. If PAP
Fallback is not enabled, the connection is activated.
Configuring the Type of Authentication
The Outbound Authentication parameter determines the type of authentication the
router uses. You enable this parameter to use two-way authentication and disable it
to use one-way authentication. The parameter is in the circuit definition window
of each dial service. Refer to the appropriate chapter for configuring circuits.
Using CHAP Names and PAP IDs for Authentication
Authentication occurs before the routers establish a connection. The router at one
or both ends of the connection must agree on the CHAP name and secret or PAP
ID and password so PPP can identify the caller and activate the correct circuit.
Figure
4-3 shows an example of routers using CHAP for authentication. PAP
works in a similar way. This example uses two-way authentication.
Figure 4-3. Routers Using CHAP for Authentication
Router A
Router B
Router C
PPP link between Router A and Router B
Dial
device
Dial
device
Dial
device
DS0019A
Local CHAP Name: Branch_A
Local CHAP Name: Branch_B
Local CHAP Name: Branch_C
Branch_C 13
Router A
Caller resolution table
Branch_B
27
Caller Name
Local Circuit
Router B
Caller resolution table
Branch_A
Caller Name
Local Circuit
5
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