4 Con?¬?guration Example: DSL Using PPPoE
Figure 2-1 PPPoE Reference Topology
The programming steps for con?¬?guring Point-to-Point Protocol over Ethernet (PPPoE) on
an Ethernet interface are as follows:
Step 1. Configure PPPoE (external modem).
Step 2. Configure the dialer interface.
Step 3. Define interesting traffic and specify default routing.
Step 4a. Configure Network Address Translation (NAT) using an access control
list (ACL).
Step 4b. Configure NAT using a route map.
Step 5. Configure Dynamic Host Configuration Protocol (DHCP) service.
ISP
Edmonton
e 2/0
10.10.30.1/24
Workstation 2
10.10.30.10/24
LAN
10.10.30.0/24 SOHO Network
ADSL
Modem PPPoE
WS1
e 0/0
(Dialer 0)
Con?¬?guration Example: DSL Using PPPoE 5
Step 6. Apply NAT programming.
Step 7. Verify a PPPoE connection.
Step 1: Con?¬?gure PPPoE (External Modem)
Virtual Private Dial-Up Network (VPDN) Programming
Edmonton(config)#interface ethernet0/0 Enters interface
con?¬?guration mode
Edmonton(config-if)#pppoe enable Enables PPPoE on the
interface
Edmonton(config-if)#pppoe-client dial-poolnumber
1
Chooses the physical
Ethernet interface for
the PPPoE client dialer
interface
Edmonton(config-if)#no shutdown Enables the interface
Edmonton(config-if)#exit Returns to global
con?¬?guration mode
Edmonton(config)#vpdn enable Enables VPDN sessions
on the network access
server
Edmonton(config)#vpdn-group PPPOE-GROUP Creates a VPDN group
and assigns it a unique
name
Edmonton(config-vpdn)#request-dialin Initiates a dial-in tunnel
Edmonton(config-vpdn-req-in)#protocol pppoe Speci?¬?es the tunnel
protocol
Edmonton(config-vpdn-req-in)#exit Exits request-dialin mode
Edmonton(config-vpdn)#exit Exits vpdn mode and
returns to global
con?¬?guration mode
6 Con?¬?guration Example: DSL Using PPPoE
NOTE: VPDNs are legacy dial-in access services provided by ISPs to enterprise
customers who chose not to purchase, con?¬?gure, or maintain access servers or
modem pools.
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