MITM/Wired/MAC Flood

One way to cause chaos in a wireless router or switch that you're trying to attack is to overwhelm it with MAC addresses. Eventually, the number of devices will become so large that the router will stop trying to store MAC addresses and will revert to failopen mode. This means that a network switch (in which each port only sees traffic destined for it) becomes a network hub (in which all ports see all traffic), making sniffing possible.

This uses the macof tool in the Dsniff suite.