Cisco Systems 520 series manual Specifies that the IP address for the dialer, Your router

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

Cisco Secure Router 520 Series Software Configuration Guide

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