Tip - How to Configure a Cisco Router Behind a Non-Cisco Cable Modem

In certain environments where a non-Cisco cable modem (CM) is used, and the CM is only capable of bridging, a Cisco router, such as the Cisco 806, can be connected to the CM via the Ethernet interface. The routing is then performed by the router behind the CM. The next step is connecting the client PC or Customer Premises Equipment (CPE) to the router. After making this connection, the Network Address Translation (NAT) is configured on the router.