Can only connect to Internet from one computer at a time on network

I have a 2 computer network in my office networked with an Asante 10/100 hub. The computers are a iMac 24 (Intel) and an old G4 (PCI). The network has worked fine until just recently. Now, I can only connect to the Internet with one computer at a time...(DSL connection). I checked cables, ports, etc, and I'm wondering if this is a 10.4.9 issue. Coincidentally, I noticed that I am not able to access the Internet via Win XP using Parallels which also worked fine up until recently. I checked with the ISP (AT&T) who confirmed that all is OK on their end. Anyone have similar problem? Could OS X 10.4.9 be the culprit? Any help on this will be much appreciated. Thanks.
iMac 24   Mac OS X (10.4.9)   2G RAM; NVIDIA GeForce 7600 GT 256

I'd consider that a 3 computer network, Parallels being a virtual machine would alias the ethernet interface and need its own IP address. That may or may not have anything to do with your problem. Actually, the way you've described things, it sounds like a lot has to do with your contract with ATT. Is there a routing device at your end?
The only way 10.4.9 could be the culprit would be if it were the routing device.
-Phil

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