Try these sites:

www.dslreports.com
www.speedguide.net
www.practicallynetworked.com
www.sympaticousers.org

I fear the only option for you, since the modem is USB, is to set up one computer as a server for the other two. Or get a cheap, older computer and use it as a Linux gateway.

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sHIFT hAPPENS11