I have not worked with cable modems before and am not sure how the configuration should be.
I have a Cisco 1721 with FastEthernet0 to the LAN (NAT inside), Ethernet0 to the cable modem (NAT outside), & serial0 to a 56Kbps Extranet (Private IP). The clients use DHCP for their configs. Serial0 and FastEthernet0 are configured and working fine. The Motorolla docs say the connection needs to be DHCP client, so I have Ethernet0 config with "ip address dhcp". So my questions are:
1. How do I config the default gateway to be Ethernet0 (ip default-network?)
2. How does NAT need to be configed to work with a dynamic address?
3. If Ethernet0 gets its info from DHCP can I pass the DNS info to the clients?
4. Am I even on the right track?
I've tried to find info on this, but all the stuff I've found on Cisco is using their cable modems.
Yes the cable ISP will be providing the public IP to the ethernet0 interface. I've entered 'ip address dhcp' under this interface. However, I am not sure it is receiving an address. How do I check? I've tried all the 'sh ip ...' that I can think of and have entered 'sh int e0' cannot tell if it has an address. I see the packet counters increasing on the interface but am unable to ping, traceroute, etc out the interface.
When I enter 'sh ip int brief' the Ethernet 0 interface shows DHCP unassigned. If the interface is not getting its address from the ISP then I believe I have a problem with the ISP at this point. Thanks for your help.
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