Cisco 700 Series Configuration Manual page 32

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
Ethernet (LAN) interface
IP address: 172.16.17.9
Subnet mask: 255.255.255.248
Cisco 700
Cisco 700 series router
system name: 765
CHAP secret: cisco
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.
3-10 Cisco 700 Series Router Configuration Guide
Connecting to an ISP–Example Configuration
ISDN (WAN) interface
IP address: 0.0.0.0.
Subnetwork mask: 0.0.0.0.
ISDN network
IP unnumbered
Central
Central site router
System name: isp