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The simple option would be to get an IP address from your ISP for each Mac on your network - but the ISP may charge extra for each address.
Another solution is to run Network Address Translation (NAT) software to share a single DSL connection among multiple computers. Several NAT options exist for the Mac. One very good choice is IPNetRouter, which is cheap, and has a great support community.
Also recommended is the companion line monitoring tool, IPNetMonitor.
Using NAT software, you connect your DSL router to a single Mac (the "gateway") and also connect the gateway Mac to an Ethernet hub. You can then connect other computers (Macs and PCs) to the hub, and they all share the DSL connection.
You can also use Apple's AirPort in this setup so the non-Gateway Macs (and PCs) can be connected wirelessly!
Mac OS X also allows software based internet sharing...
Select System Preferences -> Sharing -> Internet Tab
Also read About DSL for lots more information