Cisco Systems 700 manual Connecting to an ISP-Example Configuration

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