I am trying to figure out if I can use a cable modem with my Cisco 3600 series router? My cable modems IP address is dynamic so it can change on me. How can I configure my router to send traffic out a port that might change? I have 6 users on my network and want to implement this router to get practice with it. Any input would be helpful. Thank you.
I would think that you could install a "default" route to that interface. Ex.- if you connect to the cable modem via EO or S0 then, 0.0.0.0 E0 or 0.0.0.0 S0. Let me know what you find out. I want to do the same config. @ home.
You need to have an IOS with the DHCP client capability on it.
I use 12.2(6a) IP Plus feature set (c3620-ik9o3s-mz.122-6a.bin for VPN & firewall as well) and then configure my "internet" ethernet port with a MAC address that my cable company knows about and set it for DHCP.
I've enclosed a portion of my config so that you've got an idea. Good luck...
I'm using a 1710 Security Access Router but the config will be very similiar to the 3600. I'll assume you have a 3620 w/ 2 ethernet ports one for inside LAN interface and one for the outside cable modem interface. Most cable providers will have limitations of 10mb half duplex on their access so you will need to use either auto or hard code the port for 10mb half (outside interface). My inside interface is a fastethernet port so I use a static config of 100mb full. Since you have a dynamic ip address for your outside interface you need to use "ip address dhcp" command for your e0 or whatever is your outside interface. I have also included an extended access list for inbound entry which includes access for dhcp ports to past to the outside interface. Below is a sample config, just apply your ip addresses internally and you should be set. Good luck.... jw
ip address dhcp
ip access-group 101 in
ip nat outside
ip address 192.168.254.11 255.255.255.0
ip nat inside
access-list 1 permit 192.168.254.0 0.0.0.255
access-list 101 permit tcp any any established
access-list 101 permit udp any eq domain any
access-list 101 permit tcp any any eq ftp
access-list 101 permit udp any eq bootps any eq bootps
access-list 101 permit udp any eq bootpc any eq bootpc
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