Configuring a Cisco Router as a PPPoE Client for DSL Connectivity

How to configure Cisco 2960 switches

Configuring a Cisco Router as a PPPoE Client for DSL connectivityPPPoE: Point-to-Point Protocol over Ethernet. The PPP over Ethernet Client feature provides PPP over Ethernet (PPPoE) Client support on routers on customerpremises.

Configuring a Cisco routers as a PPPoE client for DSL connectivity, there are two cases, one for the Ethernet interfaces, and another for the ATM interfacesA. PPPoE on Ethernet interfacesPPPoE functionality is configured on a CPE router with two Ethernet interfaces. One Ethernet interface is subscriber-facing, the other provider facing.

B. PPPoE on ATM interfacesPPPoE functionality is configured on a CPE router with one Ethernet interface and one ATM interface. The Ethernet interface is subscriber-facing whereas the ATM interface is provider-facing.

Note: I noticed that on some books no one mentioned the configuration of IP domain lookup command and ISP DNS options in DHCP server configuration. Without these DSL connection will not work. Also pay attention if DSL connection did not work, to check the state of all interfaces by using show ip interface brief and make sure to issue no shutdown command on all of them.

A. PPPoE on Ethernet interfacesDSL configuration brief steps:

1. Internal Ethernet interface configuration

2. External Ethernet interface configuration

3. Dialer interface configuration

4. Configuring Access List

5. NAT/PAT configuration

6. Configuring IP domain Lookup

7. DHCP server services configuration

8. Static default route configuration

DSL configuration detailed steps:


interface FastEthernet 0/1

description internal interface ip address 172.16.1.1 255.255.255.0

ip nat inside

no shut

OR (incase you are using Cisco 877 router)

interface Vlan1


ip nat inside

no shut

2. External Ethernet interface configuration

Interface FastEthernet 0/0

Description DSL interface

no ip address

pppoe enable

pppoe-client dial-pool-number 1

no shut


interface Dialer1

ip address negotiated

ip mtu 1492

ip nat outside

encapsulation ppp

dialer pool 1

ppp authentication chap pap callin

ppp pap sent-username USERNAME password P@ssw0rd (this is the password that ISP gave it to you ppp chap hostname HOSTNAME (This is the username that ISP gave it to you)

ppp chap password P@ssw0rd

no shut


ip access-list extended DSL_ACCESSLIST100 permit ip 10.10.10.0 0.0.0.255 any

5. Configuring NAT/PAT

ip nat inside source list DSL_ACCESSLIST interface dialer 1 overload


ip domain lookup

ip name-server Primary DNS IP address (obtained from your ISP)ip name-server Secondary DNS IP address (obtained from your ISP)7. DHCP server services configuration

ip dhcp pool DSL_DHCP network 10.10.10.0 /29

dns-server Primary DNS IP address Secondary DNS IP address (obtained from your ISP) default-router 10.10.10.1 (internal VLAN or Ethernet interface Ip address)

import all


Finally, configure a static default route. It should point to the dialer interface rather than an IP address as in the below example.

ip route 0.0.0.0 0.0.0.0 dialer 1

B. PPPoE on ATM interfacesDSL configuration brief steps:


2. External ATM interface configuration (in case you are using Cisco 877 Router)3. Dialer interface configuration


5. NAT/PAT configuration


7. DHCP server services configuration


DSL configuration detailed steps:

1. Internal VLAN interface configuration (using Cisco 877 Router)

interface Vlan1


ip nat inside

no shut

OR (if you are using configurable internal Ethernet interface)

interface FastEthernet 0/1


ip nat inside

no shut

2. External ATM interface configuration

interface ATM 0

description DSL interface ip directed-broadcast

ip mask-reply

ip route-cache flow

no ip address

dsl operating-mode auto

pvc 8/35

no shutdown

pppoe-client dial-pool-number 1


interface Dialer1

ip address negotiated

ip mtu 1492

ip nat outside

encapsulation ppp

dialer pool 1

ppp authentication chap pap callin

ppp pap sent-username USERNAME password P@ssw0rd (this is the password that ISP gave it to you ppp chap hostname HOSTNAME (This is the username that ISP gave it to you)

ppp chap password P@ssw0rd

no shut


ip access-list extended DSL_ACCESSLIST100 permit ip 10.10.10.0 0.0.0.255 any

5. Configuring NAT/PAT

ip nat inside source list DSL_ACCESSLIST interface dialer 1 overload


ip domain lookup

ip name-server Primary DNS IP address (obtained from your ISP)ip name-server Secondary DNS IP address (obtained from your ISP)7. DHCP server services configuration

ip dhcp pool DSL_DHCP network 10.10.10.0 /29

dns-server Primary DNS IP address Secondary DNS IP address (obtained from your ISP) default-router 10.10.10.1 (internal VLAN or Ethernet interface Ip address) import all


Finally, configure a static default route. It should point to the dialer interface rather than an IP address as in the below example.

ip route 0.0.0.0 0.0.0.0 dialer 1

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Cisco Router 1941 CommandsHow to recover Cisco 1921 router default password?Cisco 2911 SNMP not workingHow To Recover Cisco Router PasswordThe Difference of The Cisco Catalyst 2900 and Cisco Catalyst 1900More Cisco products and Reviews you can visit: http://www.3anetwork.com/blog 3Anetwork.com is a world leading Cisco networking products wholesaler, we wholesale original new Cisco networking equipments, including Cisco Catalyst switches, Cisco routers, Cisco firewalls, Cisco wireless products, Cisco modules and interface cards products at competitive price and ship to worldwide.Our website: http://www.3anetwork.comTelephone:+852-3069-7733

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Configuring a Cisco Router as a PPPoE Client for DSL Connectivity

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