Cisco 827 - 827 Router - EN Manual do Utilizador descarregar pdf (Página 10)

Network Scenarios Pagina 10 di 35

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

ip route 0.0.0.0 0.0.0.0 Dialer 0 (default gateway)

access-list 1 permit 192.168.1.0 0.0.0.255

end

RFC 1483 Encapsulation with NAT

This network shows a remote user connecting to the Internet through an ATM connection with RFC

1483 encapsulation and NAT. You may want to use this scenario if RFC 1483 connections can be used

for the network, since there is slightly less overhead than PPP.

Figure 2-4 shows the network topology for this scenario.

Figure 2-4: RFC 1483 Encapsulation 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

RFC 1483 connection on the ATM interface. 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 ATM Interface

l Configuring NAT

l Configuration Examples

To add additional features to this network, refer to "Feature-By-Feature Router Configurations."

After configuring your router, you need to configure the PVC endpoint. For a general configuration

example, refer to "Cisco 3640 Gateway Configuration Example" at the end of this chapter.

Configuring the Ethernet Interface

Follow the steps below to configure the Ethernet interface, beginning in global configuration mode.

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Cisco 827 - 827 Router - EN Manual do Utilizador Página 10