cable modem gateway

[Morse]

I am setting up a 486 RH 6.1 to act as a gateway for my cable modem.
With a NT box I need to use two NICs ...one for the LAN and one for the 
Cable modem and then use a proxy server.
But with Linux it is not a proxy...but a simple gateway address...

Ok then do I need two NICs in the Linux box ...one for the modem and one 
for the LAN ?
  Or is there someway that I can just have one NIC for the LAN and plug the 
cable modem into the hub without purchasing separate IP addresses for the 
clients.

How should I set this up ?
TIA
morse


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