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11-2
Cisco 819 Series Integrated Services Routers Software Configuration Guide
OL-23590-02
Chapter 11 Configuring PPP over Ethernet with NAT
PPPoE
PPPoE
The PPPoE Client feature on the router provides PPPoE client support on Ethernet interfaces. A dialer
interface must be used for cloning virtual access. Multiple PPPoE client sessions can be configured on
an Ethernet interface, but each session must use a separate dialer interface and a separate dialer pool.
A PPPoE session is initiated on the client side by the Cisco 819 ISRs. An established PPPoE client
session can be terminated in one of two ways:
• By entering the clear vpdn tunnel pppoe command. The PPPoE client session terminates, and the
PPPoE client immediately tries to re-establish the session. This also occurs if the session has a
timeout.
• By entering the no pppoe-client dial-pool number command to clear the session. The PPPoE client
does not attempt to re-establish the session.
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 Virtual Private Dialup Network Group Number, page 11-2
• Configure the Fast Ethernet WAN Interfaces, page 11-3
• Configure the Dialer Interface, page 11-4
• Configure Network Address Translation, page 11-6
An example showing the results of these configuration tasks is shown in the “Configuration Example”
section on page 11-9.
Configure the Virtual Private Dialup Network Group Number
Configuring a virtual private dialup network (VPDN) enables multiple clients to communicate through
the router by way of a single IP address.
Complete the following steps to configure a VPDN, starting from the global configuration mode.
SUMMARY STEPS
1. vpdn enable
2. vpdn-group name
3. request-dialin
4. protocol {l2tp | pppoe}
5. exit
6. exit