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CHAPTER
11-1
Cisco 819 Series Integrated Services Routers Software Configuration Guide
OL-23590-02
11
Configuring PPP over Ethernet with NAT
This chapter provides an overview of Point-to-Point Protocol over Ethernet (PPPoE) clients and Network
Address Translation (NAT) that can be configured on the Cisco 819 Integrated Services Routers (ISRs).
Multiple PCs can be connected to the LAN behind the router. Before the traffic from these PCs is sent
to the PPPoE session, it can be encrypted, filtered, and so forth.
Figure 11-1 shows a typical deployment
scenario with a PPPoE client and NAT configured on the Cisco router.
Figure 11-1 PPP over Ethernet with NAT
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Internet
1 Multiple networked devices—Desktops, laptop PCs, switches
2 Fast Ethernet LAN interface (inside interface for NAT)
3 PPPoE client—Cisco 819 ISRs
4 Point at which NAT occurs
5 Fast Ethernet WAN interface (outside interface for NAT)
6 Cable modem or other server that is connected to the Internet
7 PPPoE session between the client and a PPPoE server