The authentication process can be repeated any time after the link is established. CHAP provides protection against playback attack through the use of the variable challenge value, which is unique and unpredictable. Repeated challenges limit the time of exposure to any single attack. The corporate office router controls the frequency and timing of the authentication attempts. You can also configure the router to allow the logical and physical configurations to be dynamically bound together on a per-call basis.
All calls going to or from a destination subnetwork use the same dialer profile.
Because the Cisco 805 router has only a serial interface, the sample networks specify the call characteristics with the dialer interface configuration rather than defining a dialer map class. A dialer pool of physical interfaces to be used by the dialer interface. The physical interfaces in a dialer pool are ordered according to priority. Dialer Interface A dialer interface is a WAN interface on the router that is not connected to a remote device all the time but which dials the remote device whenever a connection is required. Configuring an interface on a Cisco router to dial a specific remote device at specific times requires configuring dialer profiles.