Cisco Systems OL-6426-02 manual PPPoA, Configuration Tasks

Chapter 4 Configuring PPP over ATM with NAT

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In this scenario, the small business or remote user on the Fast Ethernet LAN can connect to an Internet Service Provider (ISP) using the following protocols on the WAN connection:

•Asymmetric digital subscriber line (ADSL) over plain old telephone service (POTS) using the Cisco 1801 router

•ADSL over integrated services digital network (ISDN) using the Cisco 1802 router

•Single-pair high-speed digital subscriber line (G.SHDSL) using the Cisco 1803 router

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 ADSL, ISDN, or G.SHDSL lines. The dialer interface is used to connect to the ISP.

PPPoA

The PPPoA Client feature on the router provides PPPoA client support on ATM interfaces. 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.

A PPPoA session is initiated on the client side by the Cisco 1800 series router.

NAT

NAT (represented as the dashed line at the edge of the Cisco router) signifies two addressing domains and the inside source address. The source list defines how the packet travels through the network.

Configuration Tasks

Perform the following tasks to configure this network scenario:

•Configure the Dialer Interface

•Configure the ATM WAN Interface

•Configure DSL Signaling Protocol

•Configure Network Address Translation

An example showing the results of these configuration tasks is shown in the section “Configuration Example.”

Cisco 1800 Series Integrated Services Routers (Fixed) Software Configuration Guide

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