Cisco 800 Series Routers

Configuring a Cisco 827 Router With IP Unnumbered E0, PPPoA, PPP-PAP, and Manually Configured Local LAN Devices

Cisco - Configuring a Cisco 827 Router With IP Unnumbered E0, PPPoA, PPP-PAP, and Manually Configured Local LAN Devices

Document ID: 12906

Updated: Nov 23, 2007



This sample configuration shows a Cisco 827 digital subscriber line (DSL) Router connecting to a Cisco 6130 Digital Subscriber Line Access Multiplexer (DSLAM) and terminating on a Cisco 6400 Universal Access Concentrator (UAC). The Cisco 827 has been configured with PPP over ATM (PPPoA).

The Internet Service Provider (ISP) has given the subscriber a range of IP addresses, to, with a mask of IP address "" will be manually configured on the Ethernet interface of the Cisco 827. The subscriber will manually configure the remaining IP addresses on the local LAN devices. Each local device should be configured with a default gateway IP address of (the IP address of the Cisco 827 Ethernet interface).

Before You Begin


For more information on document conventions, see the Cisco Technical Tips Conventions.


There are no specific prerequisites for this document.

Components Used

The information in this document is based on the software and hardware versions below.

  • Cisco 827-4V Customer Premises Equipment (CPE) IOS® Software Release 12.1(1)XB

  • Cisco 6400 UAC-Node Route Processor (NRP) IOS Software Release 12.0(7)DC

  • Cisco 6400 UAC-Node Switch Processor (NSP) IOS Software Release 12.0(4)DB

  • Cisco 6130 DSLAM-NI2 IOS Software Release 12.1(1)DA

The information presented in this document was created from devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If you are working in a live network, ensure that you understand the potential impact of any command before using it.


In this section, you are presented with the information to configure the features described in this document.

Note: To find additional information on the commands used in this document, use the Command Lookup Tool (registered customers only) .

Network Diagram

This document uses the network setup shown in the diagram below.



This document uses the configuration shown below.

Cisco 827
version 12.1
service timestamps debug datetime msec 
service timestamps datetime msec 
hostname R1 
ip subnet-zero 

interface Ethernet0 
 ip address 
 no ip directed-broadcast 
 no ip mroute-cache
interface ATM0 
 no ip address 
 no ip directed-broadcast 
 no ip mroute-cache 
 no atm ilmi-keepalive
 pvc 1/150 
  encapsulation aal5mux ppp dialer 
  dialer pool-member 1 
 hold-queue 224 in 
interface Dialer0 
 ip unnumbered Ethernet0 
 no ip directed-broadcast 
 encapsulation ppp 
 dialer pool 1 
 dialer-group 1 
 ppp pap sent-username username password password
ip classless 
ip route Dialer0 
no ip http server 
dialer-list 1 protocol ip permit
voice-port 1 
 timing hookflash-in 0
voice-port 2
 timing hookflash-in 0 
voice-port 3
 timing hookflash-in 0 
voice-port 4 
 timing hookflash-in 0 


There is currently no verification procedure available for this configuration.


There is currently no specific troubleshooting information available for this configuration.

Related Information

Updated: Nov 23, 2007
Document ID: 12906