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Cisco Router and Security Device Manager Version 2.2 User’s Guide
OL-4015-08
Chapter4 Edit Interface/Connection
Authentication
Dynamic DNS
Enable dynamic DNS if you want to automatically update your DNS servers
whenever the WAN interface’s IP address changes.
Note This feature appears only if supported by your Cisco server’s IOS.
To choose a dynamic DNS method to use, do one of the following:
•Enter the name of an existing dynamic DNS method.
Enter the name in the Dynamic DNS Method field exactly as it appears in
the list in Configure > Additional Tasks > Dynamic DNS Methods.
•Choose an existing dynamic DNS method from a list.
Click the drop-down menu and choose to use an existing method. A window
with a list of existing dynamic DNS methods will open. This menu choice is
available only if there are existing dynamic DNS methods.
•Create a new dynamic DNS method.
Click the drop-down menu and choose to create a new dynamic DNS method.
To clear an associated dynamic DNS method from the interface, choose None
from the drop-down menu.
Authentication
This page is displayed if you enabled PPP for a serial connection or PPPoE
encapsulation for an ATM or Ethernet connection, or are configuring an ISDN
BRI or analog modem connection. Your service provider or network administrator
may use a Challenge Handshake Authentication Protocol (CHAP) password or a
Password Authentication Protocol (PAP) passwo rd to secure the connection
between the devices. This password secures both incoming and outgoing access.

CHAP/PAP

Check the box for the type of authentication used by your service provider. If you
do not know which type your service provider uses, you can check both boxes: the
router will attempt both types of authentication, and one attempt will succeed.