Configuring a Cisco Router as a PPPoE Client for DSL connectivity
PPPoE: Point-to-Point Protocol over Ethernet. The PPP ov...
ip nat inside
no shut
OR (incase you are using Cisco 877 router)
interface Vlan1
description internal interface
ip address...
6. Configuring IP domain Lookup
ip domain lookup
ip name-server Primary DNS IP address (obtained from your ISP)
ip name-se...
ip address 172.16.1.1 255.255.255.0
ip nat inside
no shut
OR (if you are using configurable internal Ethernet interface)
i...
100 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 ...
routers, Cisco firewalls, Cisco wireless products, Cisco modules and interface cards
products at competitive price and shi...
routers, Cisco firewalls, Cisco wireless products, Cisco modules and interface cards
products at competitive price and shi...
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Configuring a Cisco Router as a PPPoE Client for DSL Connectivity

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Configuring a Cisco Router as a PPPoE Client for DSL Connectivity

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Configuring a Cisco Router as a PPPoE Client for DSL Connectivity

  1. 1. Configuring a Cisco Router as a PPPoE Client for DSL connectivity PPPoE: Point-to-Point Protocol over Ethernet. The PPP over Ethernet Client feature provides PPP over Ethernet (PPPoE) Client support on routers on customer premises. 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 interfaces A. PPPoE on Ethernet interfaces—PPPoE 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 interfaces—PPPoE 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 interfaces DSL 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: 1. Internal Ethernet interface configuration interface FastEthernet 0/1 description internal interface ip address 172.16.1.1 255.255.255.0 1
  2. 2. ip nat inside no shut OR (incase you are using Cisco 877 router) interface Vlan1 description internal interface ip address 172.16.1.1 255.255.255.0 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 3. Dialer interface configuration 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 4. Configuring Access List ip access-list extended DSL_ACCESSLIST 100 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 2
  3. 3. 6. Configuring IP domain Lookup 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 8. Static default route configuration 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 interfaces DSL configuration brief steps: 1. Internal Ethernet interface configuration 2. External ATM interface configuration (in case you are using Cisco 877 Router) 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: 1. Internal VLAN interface configuration (using Cisco 877 Router) interface Vlan1 description internal interface 3
  4. 4. ip address 172.16.1.1 255.255.255.0 ip nat inside no shut OR (if you are using configurable internal Ethernet interface) interface FastEthernet 0/1 description internal interface ip address 172.16.1.1 255.255.255.0 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 3. Dialer interface configuration 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 4. Configuring Access List ip access-list extended DSL_ACCESSLIST 4
  5. 5. 100 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 6. Configuring IP domain Lookup 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 8. Static default route configuration 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 More related: Cisco Router 1941 Commands How to recover Cisco 1921 router default password? Cisco 2911 SNMP not working How To Recover Cisco Router Password The Difference of The Cisco Catalyst 2900 and Cisco Catalyst 1900 More 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 5
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  7. 7. routers, Cisco firewalls, Cisco wireless products, Cisco modules and interface cards products at competitive price and ship to worldwide. Our website: http://www.3anetwork.com Telephone: +852-3069-7733 Email: info@3Anetwork.com Address: 23/F Lucky Plaza, 315-321 Lockhart Road, Wanchai, Hongkong 6

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