1 Displays information
speci?¬?c to the ADSL for
a speci?¬?ed ATM interface
Edmonton#debug ppp authentication Displays authentication
protocol messages such as
CHAP and PAP messages
Edmonton#show ip dhcp binding Displays address bindings
on the Cisco IOS DHCP
server
Edmonton#show ip nat translations Displays active NAT
translations
Con?¬?guring a Cable Modem Connection 15
Con?¬?guring a Cable Modem Connection
Figure 2-2 shows a LAN connection and a cable connection to the ISP broadband router.
Figure 2-2 Cable Modem Connection Reference Topology
The programming steps for con?¬?guring a cable modem connection are as follows:
Step 1. Configure WAN connectivity
Step 2. Configure local DHCP service.
Step 3. Configure NAT using a route map.
Step 4. Configure default routing.
Step 5. Apply NAT programming.
NOTE: Connection to a cable system using an external modem is simply a LAN
connection with NAT, DHCP, and ?¬?rewall programming.
ISP
Edmonton
Fa 0/1
10.10.30.1/24
Fa 0/0
IP DHCP
Workstation 2
10.10.30.10/24
LAN
10.10.30.0/24 SOHO Network
Cable
Modem
WS1
16 Con?¬?guring a Cable Modem Connection
Step 1: Con?¬?gure WAN Connectivity
Edmonton(config)#interface fastethernet 0/0 Enters interface
con?¬?guration mode
Edmonton(config-if)#no ip route-cache Disables fast switching at
this interface
Edmonton(config-if)#no cdp enable Disables Cisco Discovery
Protocol (CDP) at this
interface
Edmonton(config-if)#mac-address 0017.
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