Cisco 827 - 827 Router - EN Bedienungsanleitung PDF herunterladen (Seite 6)

Network Scenarios Pagina 6 di 35

http://www.cisco.com/univercd/cc/td/doc/product/access/acs_fix/827/827swcfg/ntwkscen.htm 14/02/2001

interface ATM0

no ip address

no ip directed-broadcast (default)

pvc 8/35

encapsulation aal5snap

bridge-group 1

ip classless (default)

bridge 1 protocol ieee

end

PPP over ATM with NAT

This network shows a user connected to the Internet through PPP over ATM and one static IP address.

You may want to use this scenario in your network if you want to access the network with ATM support

at the endpoints. PPP over ATM provides a network solution with simplified address handling and gives

straight user verification as you would get in a dial network.

Figure 2-3 shows the network topology for this scenario.

Figure 2-3: PPP over ATM with NAT

In this scenario, the small business or remote user on the Ethernet LAN can connect to the Internet

through ADSL. The Ethernet interface carries the data packet through the LAN and offloads it to the

PPP connection on the ATM interface. The dialer interface is used to connect to the Internet or the

corporate office. The number of ATM PVCs is set by default.

NAT (represented as the dashed line at the edge of the 827 routers) signifies two addressing domains

and the inside source address. The source list defines how the packet travels through the network.

The following configuration topics are covered in this section:

l Configuring the Ethernet Interface

l Configuring the Dialer Interface

l Configuring the ATM Interface

l Configuring NAT

l Configuration Example

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Cisco 827 - 827 Router - EN Bedienungsanleitung Seite 6