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Cisco 1800 Series Integrated Services Routers (Fixed) Software Configuration Guide
OL-6426-02
Chapter 3 Configuring PPP over Ethernet with NAT
Configure the Dialer Interface
Configure the Dialer Interface
The dialer interface indicates how to handle traffic from the clients, including, for example, default
routing information, the encapsulation protocol, and the dialer pool to use. The dialer interface is also
used for cloning virtual access. Multiple PPPoE client sessions can be configured on a Fast Ethernet
interface, but each session must use a separate dialer interface and a separate dialer pool.
Complete the following steps to configure a dialer interface for one of the Fast Ethernet LAN interfaces
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 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 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 Ethernet 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 to 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.