Hack the Route Start free Open app Switches and VLANs
MAC flooding
Filling a switch's MAC table with made-up addresses so that it floods everyone's frames to every port.
A MAC table has a fixed size. An attacker sends frames from thousands of invented source addresses (macof
does it); once the table is full, the switch cannot learn where real devices are, so it floods their frames, and the
attacker reads traffic meant for others, as on a hub. The defence is port security: a limit on how many MAC
addresses one port may teach the switch, beyond which the port drops them or shuts down.