you may check the hardware settings, for example, configure all of the
computers' network cards for half duplex. Most Hubs don't support full
duplex.
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Robert Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN, Anti-Virus, Tips & Troubleshooting on http://www.ChicagoTech.net
This posting is provided "AS IS" with no warranties.