I'm afraid you can't connect a modem to a hub (in this circumstance) :)
If your ADSL modem only has an ethernet port, your linux box will need two network cards. One to connect the PC to the hub, and one to connect the PC to the modem. If the modem has a USB port, and it's one of the (relatively few) ADSL modems with a Linux driver, you could connect it via USB and thus avoid the need for a second network card.
Wrong ;)
i used this config for a while (before buying a second NIC on my gateway ;p) :
adsl model (ethernet) connected on hub, three pcs on th same hub (1 linux gateway, 2 workstation under linux/win XP)
and i was able to use the modem from every pc (only one at a time though ;p), i never understood how, but it worked, and allowed me to reinstall my gateway using internet (useful for gentoo ;p) via my main workstation, withtout having to modify any physical connections in my network...
maybe it was a patricular case, but i don't think so =)
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.
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.
MAL
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