You could drop a second LAN card into your PC; set one up to talk to the cable modem, the other to talk to your LAN. Getting two LAN cards to co-exist can be a pain in the ass though.
Have you bought your hub yet? If not, look around some on-line vendors for a router, such as the Netgear RT314 (router with 4 port 10/100 switch), otherwise a Netgear RT311 will work. These go between your LAN and the Cox service, so all your PCs can use whatever IP addresses and hostnames you please, yet can still access the internet.
Be aware that Cox does not support home networking with a router, as they'd rather sell you 'x' static IP addresses for your PCs at $7-95 per month. For my setup (6 PCs), what I spent on the router has already been paid back in IP address savings.
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