hello, i have been trying to connect Cisco 1720 router to time-warner cable modem for home network. the router has two ethernet ports, fa0 and eth0. i want eth0 to be internal and fa0 to connect to modem. i enabled dhcp on fa0, but the cable modem always gives a private IP instead of public. time warner has no idea how to fix this. their response was that for some reason the modem thinks that the router is one of their network's nodes.
i would really appreciate your response.