Chapter 5: Configuring DSL Access with PPPoE

Several components of PPPoE over DSL need to be configured:

• Ethernet/ATM interface
• Dialer interface configuration
• PAT configuration
• DHCP service configuration
• Static default route configuration

Provider-facing Ethernet/ATM Interface Configuration

Ethernet interface:

interface Ethernet0/0
 no ip address
 pppoe enable
 pppoe-client dial-pool-number 1

ATM interface:

interface ATM0/0
 no ip address
 dsl operating-mode auto
 pvc 8/35
 pppoe-client dial-pool-number 1

Dialer Interface Configuration

interface Dialer0
 ip address negotiated
 ip mtu 1492
 encapsulation ppp
 dialer pool 1

Port Address Translation Configuration

interface Ethernet0/0
 ip nat inside
!
interface Dialer0
 ip nat outside
!
ip nat inside source list 100 interface dialer0 overload
access-list 100 permit ip 172.16.0.0 0.0.255.255 any

DHCP Service Configuration for LAN Clients

ip dhcp exclude-address 172.16.0.1 172.16.0.9
!
ip dhcp pool LAN
 import all
 network 172.16.0.0 255.255.0.0
 default-router 172.16.0.1

Static Default Route Configuration

ip route 0.0.0.0 0.0.0.0 interface dialer0

Verification

show pppoe session all can be used to verify active PPPoE sessions.