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Because the MAC address is normally not used for TCP/IP communications, duplicate IP addresses are not allowed on the same network segment. What usually happens is that the first computer works until the second computer joins the network. Then you see duplicate IP address errors on both computers and communications falls apart. The problem is that the computers don't just listen for their name (IP address in this case) to be called, they actively announce who and where they are. Imagine twin brothers in the mall. One is at Carl's Jr yelling "I'm John Smith and I'm at Carl's Jr." while the other, just 50 feet away, yells "I'm John Smith and I'm at Cinnabon." The poor guy who is looking to deliver a message is going to be awfully confused.

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16y ago

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