MYSTERY: 3 Macs in network: Cant connect all 3 at once !??

I have an Intel-based iMac 20" and two 2005 models G5 (a dual 2.0 and a dual 2.3) sharing the same DSL internet connection via 2 Ethernet hubs.
Each Mac is able to connect to the Internet - but not at the same time.
I can only have a max of 2 macs connected at any given time.
I can only connect with the two G5s or one G5 and the iMac at the same time.
Right now I cannot connect to anything with the dual 2.0 G5.
Even with direct cabing to the DSL modem and all other connections off.
I still havent figured out why one Mac can connnect, and another cant.
Perhaps the ISP (Internet service provider) has a limit to how many computers you can connnect to a network?
Or perhaps I have a setting on my machine(s) that limits the no of Macs I can connect?
I have restarted and reset the hubs, the modem...****, I even rebooted my dog. Nothing helps!
I am going bonkers over this, so please save me from the asylum.

What IP address do your Macs get when they're online?
If they're real-world IP addresses then, yes, this is a limit of how many connections your ISP provides.
If they're private-class addresses (like 192.168.x.x or 10.x.x.x) then you should be able to get more than two machines online.
I'm guessing the former. If that is the case then you need to get a NAT router that can take one of the IP addresses handed out by your ISP and share it amongst multiple client systems.

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