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4-3
Cisco Secure Router 520 Series Software Configuration Guide
OL-14210-01
Chapter 4 Configuring PPP over ATM with NAT
Configure the Dialer Interface
Perform these steps to configure a dialer interface for the ATM interface on the router, starting in global
configuration mode:
Command Purpose
Step 1
interface dialer dialer-rotary-group-number
Example:
Router(config)# interface dialer 0
Router(config-if)#
Creates a dialer interface (numbered 0–255), and
enters into interface configuration mode.
Step 2
ip address negotiated
Example:
Router(config-if)# ip address negotiated
Router(config-if)#
Specifies that the IP address for the dialer
interface is obtained through PPP/IPCP (IP
Control Protocol) address negotiation.
Step 3
ip mtu bytes
Example:
Router(config-if)# ip mtu 1492
Router(config-if)#
Sets the size of the IP maximum transmission unit
(MTU). The default minimum is 128
bytes. The
maximum for ATM is 1492
bytes.
Step 4
encapsulation encapsulation-type
Example:
Router(config-if)# encapsulation ppp
Router(config-if)#
Sets the encapsulation type to PPP for the data
packets being transmitted and received.
Step 5
ppp authentication {protocol1 [protocol2...]}
Example:
Router(config-if)# ppp authentication chap
Router(config-if)#
Sets the PPP authentication method.
The example applies the Challenge Handshake
Authentication Protocol (CHAP).
For details about this command and additional
parameters that can be set, see the Cisco IOS
Security Command Reference.
Step 6
dialer pool number
Example:
Router(config-if)# dialer pool 1
Router(config-if)#
Specifies the dialer pool to use to connect to a
specific destination subnetwork.
Step 7
dialer-group group-number
Example:
Router(config-if)# dialer-group 1
Router(config-if)#
Assigns the dialer interface to a dialer group
(1–10).
Tip Using a dialer group controls access to
your router.