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    Packages are routed to a specific IP these days, but you can also spoof it. You can sent special packages to distort this routing. owasp.org/index.php/Man-in-the-middle_attack en.wikipedia.org/wiki/ARP_spoofing Commented Jun 5, 2014 at 13:01
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    Mac addresses (Layer 2) are used to direct packets on a local network. (IP addresses are looked at by routers and not hubs or switches). Hubs forward packets to everyone, switches only forward packets to the intended target (or ARP spoofed one) that the switch has learnt. Routers with built in wifi will almost certainly have switches and not hubs built into them. Commented Jun 5, 2014 at 15:14