Port security settings allow the switch to still save legitimate MAC addresses while limiting potentially malicious input. The process will vary depending on the router you use, but in most cases you can limit the number of new MAC addresses that can be added to the forwarding table or select a specific number of addresses that are not to be overwritten when the table runs out of space. Through your network settings, you can set up port security, a set of network controls that mitigate the risks of attacks. Use the following tips to lower the chances of a MAC flooding attack being successful on your network. Since the hacker is connected to the network, they can view everyone else’s data. In short, the hacker disables the address book function, and the switch, still determined to pass on new data packets, just disseminates them to the whole network. The table automatically adds these new MAC addresses to its table until it fills up and can no longer add new MAC addresses.Īt this point, it enters a state called “fail-open mode” in which any new data packets it receives is sent to every port (and device) on its network.
In a MAC flooding attack, the attacker floods a network’s MAC address table with fake data packets with different source MAC addresses. When it receives a data packet containing a new MAC address, it saves that address to its forwarding table, linking it to a specific network port. The switch operates as a kind of sorting office, receiving data packets and passing them on to the right device on its network.Ī switch also maintains a forwarding table - in essence, an address book, matching MAC addresses to network ports. When data is sent between devices on a network, it passes through a system called a switch.
Every device has a MAC address, a unique numerical signifier used to identify that device within a network. MAC flooding takes advantage of media access control (MAC) addresses.
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