They’re sent over the air with each packet going to and from the device, as the MAC address is used to ensure each packet gets to the right device.īut MAC addresses can be easily spoofed in many operating systems, so any device could pretend to have one of those allowed, unique MAC addresses. RELATED: How an Attacker Could Crack Your Wireless Network SecurityĪll an attacker has to do is monitor the Wi-Fi traffic for a second or two, examine a packet to find the MAC address of an allowed device, change their device’s MAC address to that allowed MAC address, and connect in that device’s place. You may be thinking that this will not be possible because the device is already connected, but a “deauth” or “deassoc” attack that forcibly disconnects a device from a Wi-Fi network will allow an attacker to reconnect in its place. An attacker with a toolset like Kali Linux can use Wireshark to eavesdrop on a packet, run a quick command to change their MAC address, use aireplay-ng to send deassociation packets to that client, and then connect in its place. This entire process could easily take less than 30 seconds. HOW TO ENABLE MAC FILTERING ON ARRIS ROUTER MANUALĪnd that’s just the manual method that involves doing each step by hand - never mind the automated tools or shell scripts that can make this faster.

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