CCNP ISCW Notes

1 Apr 2008

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.

« Chapter 4: Using DSL to Connect to a Central Site

Chapter 6: Configuring DSL Access with PPPoA »

Gerard Metoho-Eke commented on 11 Sep 2008 at 7:24 a.m.

One of the best summary I have seen. It make life easier and time well spent. Good job. Gerard

sam commented on 15 Sep 2008 at 3:18 a.m.

nice work