Yes, only one at a time... meaning it's pointless. You aren't circumventing the need for multiple network cards at all. You might as well just plug the modem into each pc one by one.
All you are doing is extending the network connection that would normally connect the modem to the PC, by sticking a hub inbetween.
in my case I was quite happy to discover that, since i'm really a lazy boy, and being able to modify my routing and connection point without moving anything in my bedroom was really a pleasure. that way, i can hide everything behind lots of mess, without having to dig through when i need to change something ;p
If you had a routing capable modem, ie. a router, you /could/ connect it to a hub.
I did however, just wonder whether maybe you could connect the modem to the hub as you stated, then configure your linux pc only to 'dial up' via the modem, and run IP masquerading on it. Then set all the other machine's gateway's to the IP of your linux box. No idea how this would affect the modem's ability to operate. It may get confused by broadcast packets from the other PCs.
that's what i did, for at least 6 monthes. the linux box was my gateway, controlling the connection and making NAT/masquerading, connected to the hub, and the modem on the hub too. it worked well, and the modem was'nt disturbed by broadcast =)
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cab
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