Routing IP with a Cisco 700 Series Router to an ISP

The example also uses an unnumbered IP address on the Cisco 700 series router and a dynamically-assigned IP address from the ISP, a common practice used to conserve IP addresses.

Figure 3-2 Connecting to an ISP–Example Configuration

ISDN (WAN) interface

IP address: 0.0.0.0.

Subnetwork mask: 0.0.0.0.

Ethernet (LAN) interface

IP address: 172.16.17.9

Subnet mask: 255.255.255.248

 

 

 

ISDN

network

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cisco 700

Central

 

 

 

 

Cisco 700 series router

 

 

Central site router

 

system name: 765

IP unnumbered

System name: isp

 

CHAP secret: cisco

 

 

 

 

 

 

 

H8757

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

In this example, a user-defined profile named isp is created, representing the ISP router. Your router uses the isp profile to initiate the call to the ISP router.

When the Cisco 700 series router calls the ISP router, it sends the ISP the PPP host name, the CHAP secrets, and PAP passwords, depending upon what the other router requires to authenticate the call.

3-10Cisco 700 Series Router Configuration Guide

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Cisco Systems 700 manual Connecting to an ISP-Example Configuration