Configure PPPoE Client Configuration on cisco routers - Cisco 887VA router as PPPoE client over DSL

In this article, I will explain configuring the cisco 887va router as PPPoE client over ADSL.

 There are two options to connect a cisco router over DSL:

PPPoE on Ethernet interfaces: PPPoE is configured on a cisco router with two Fast Ethernet interfaces. One Ethernet interface is connected to the service provider, and the other is connected to the local area network.

PPPoE on ATM interfaces: PPPoE is configured on a Cisco router with oneFast Ethernet interface connected to the local area network, and one ATM interface (RJ-11) connected to the service provider.

Before starting the configuration we should know there is a logical interface on the router called dialer interface which contains configuration information (such as encapsulation protocol, dialer pool number, username and password) to connect to the ISP.

A dialer interface must be used for cloning virtual access. Multiple PPPoA client sessions can be configured on an ATM interface, but each session must use a separate dialer interface and a separate dialer pool.

Configuration steps

1.       Configure the LAN interface: First of all, assign ip address for local network, for example 10.100.1.0/24, Cisco 887VA router has four layer 2 switch ports belong to vlan 1 by default. So, assign an ip address to the interface vlan 1 for your local network.

R(config)#int vlan 1

R(config-if)#ip address 192.168.50.1 255.255.255.0

R(config-if)#no sh           

2.       Configure the ATM interface: Creates an ATM PVC for each end node (up to ten) with which the router communicates. Enters ATM virtual circuit configuration mode. When a PVC is defined, AAL5SNAP encapsulation is defined by default.

Router(config)# interface atm 0

Router(config-if)# pvc 8/35

Specifies the encapsulation type for the PVC and points back to the dialer interface.

Router(config-if-atm-vc)# encapsulation aal5mux ppp dialer

Specifies the ATM interface as a member of a dialer profile dialing pool. The pool number must be in the range of 1–255.

Router(config-if-atm-vc)# dialer pool-member 1

3.       Configure the dialer interface: The Dialer interface should be 1492 as PPPoE adds an 8 byte encapsulation header.  the maximum/default Ethernet MTU size is 1500 bytes.Specifies that the IP address for the dialer interface is obtained through PPP/IPCP (IP Control Protocol) address negotiation. The Fast Ethernet interface carries the data packet through the LAN and off-loads it to the PPP connection on the ATM interface. The ATM traffic is encapsulated and sent over the xDSL interface. The dialer interface is used to connect to the ISP.

 Router(config)# interface dialer 0

Router(config-if)# ip address negotiated

Sets the size of the IP maximum transmission unit (MTU). The default minimum is 128 bytes. The maximum for ATM is 4470 bytes.

Router(config-if)# ip mtu 1492

Sets the encapsulation type to PPP for the data packets being transmitted and received.

Router(config-if)# encapsulation ppp

Specifies the dialer pool to use to connect to a specific destination subnetwork.

Router(config-if)# dialer pool 1

4.       Configure Default route

Router(config)# ip route 10.10.25.2 0.255.255.255 dialer 0

5.       Configure NAT: you need to allow the local network to reach the internet, so you should configure Nat on your router by specifying the inside interface (vlan 1) and outside interface(dialer 1), and specifying which range of ip addresses can access the internet using the access-list as shown below.

R(Config)#access-list 1 permit 192.168.50.0 255.255.255.0

Router(config)# ip nat inside source list 1

interface dialer 1 overload

Router(config)# interface vlan 1

Router(config-if)# ip nat inside

Router(config)# interface dialer 0

Router(config-if)# ip nat outside

When we configure ATM and dialer interface as shown above, we use pvc provided by DSL provider on the atm interface, and use username and passwords provided by the DSL provider on the dialer interface.

To do so, the video link below is created on real-time environment

Real-time environment cisco pppoe client Lab

To download the configuration file, and the scenario file, click on the following link

Configuration file

Scenario file

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