Modem with mac & PC

I am trying to share a cable modem with someone who has a PC. My sister doesn't have wireless internet, she uses a cable modem and a CAT5 cable. When I separate the CAT5 from her computer and try to plug in mine, I am unable to connect to the internet.
I'm able to plug her computer back in and get right on the internet, so I know it is not a 'power cycling' issue with the modem itself. And we've tried plugging in a friend's macbook and had the same results.
Is there any way around this problem? Of course I can just get online using my sister's computer, but there are times when it would just be faster to use my own.
TIA.

HI, Chaplin
this can have different reasons. The most likely is the following:
when connecting, the provider hands out an ip address through the modem to the computer. This address usually stays valid during connection time, and for a given time after disconnection (typically orders of a few hours). Thus, when disconnecting the pc, one cannot immediately connect any other computer for this amount of time. Only after the time-out period it should be possible.
using an airport express or similar thing allows you to connect more than one computer simultaneously. i think this might also be possible with other (non-wireless) devices, but i have no experience with this.
Hope this helps
Thomas

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