Avaya Configuring Dial Services Bedienungsanleitung Seite 64

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Configuring Dial Services
3-4 114062 Rev. A
The receiving router can use both 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 the authentication.
The Outbound Authentication parameter lets you configure whether the router
uses one-way or two-way authentication. This parameter is in the circuit window
of each dial service. Refer to the appropriate chapter for configuring circuits.
Note that for one-way authentication to work, you must enable the PPP parameter
PAP Fallback. Refer to Configuring PPP Services for more information.
How the Router Uses CHAP Names and PAP IDs for Authentication
The authentication process takes place before the routers establish a connection.
The router at one end or both ends of the connection must agree on the CHAP
name and secret or PAP ID and password so PPP can determine who is calling the
router and which circuit to bring up.
Figure 3-3 shows an example of how the router uses CHAP names and secrets.
PAP IDs and passwords work in a similar way. The routers in this example are
using two-way authentication. Routers A and B have a caller resolution table that
maps circuit numbers to names. The routers use their resolution tables to identify
the caller and to bring up a circuit.
For example, you configure Router As table to specify that Branch_B is the
CHAP name for all links between it and Router B. Router B’s table indicates
Branch B is associated with Circuit 5, which connects to Router A. When Router
A calls Router B, it places the CHAP name, Branch B, and secret in the call setup.
Router B looks in its table, confirms the name and secret, and brings up Circuit 5.
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