How to share internet

I got cable, 512/128, i have 3 computers, so i want to share the conection, so i bough a switch, but i t doesnt work, because there is only 1 ip, and i can?t share it, so i ried with direct connection with 2 computers, didn?t work, ia Agot internet, Bdoesnt have, if B got internet, Adoesn?t have..so i decide to call the agency, they said that i have to make my computer like a server, useing a proxy progran to share with the other computers, and i have no idea of what they talking about. some suggestions?

What you need to get is a router. You may also need to get some ethernet cable if you don't have enough. Basically any computer store should have a router. I'd recommend Linksys from my experience with them.

a router is very expensive, if i could make my computer as a server it would work, buying a router is the last method that i will use :)

actually a switch usually costs more than your standard 4 port wire only router. Wireless routers yes are more expensive but i paid 89$ for my 8port switch and a dlink di-604 4 port DCHP router only costs around 70$

well, my 8 ports swicth cost 30 and a router cost 100

You can get 802.11B routers for around 30$.

Does your modem have USB on it?

If so, just hook up a computer that you can leave on whenever another computer wants to get onto the internet.

Connect the computers.

Then, use Internet Connection Sharing to share that connection.

Next, set an IP for that computer (192.168.1.2)
Subnet mask should be 255.255.255.0

Then, set up the other comptuers with ip addresses (192.168.1.*). Tell them to use the default gateway of 192.168.1.2
Use the same subnet mask.

Hopefully, they will now use the internet connection on the main computer.

still not working, but i wll try to buy a router later, thanks you all