![]() ![]() macof sends a packet to to MAC B with a source MAC address of 0000.CAFE.000.MAC B to MAC 0000.CAFE.000 macof also needs to send all packets it has intercepted to MAC B macof needs to keep sending the first packet.The switch will now update its routing table to think that MAC B now actually lives on interface Fa0/3 (where you sent the packet from using macof). ![]() macof sends a packet to 0000.CAFE.0000 with the source MAC address of MAC B.MAC B to destined for MAC 0000.CAFE.000.In this example MAC C wants to use a man in the middle attack to receive all packets from: You can use macof to generate a packet with a source mac address that is not really yours. Why? Because if the shared table is full than each VLAN no longer knows what ports legitimate MAC address(es) are on. Flooding a single VLAN would force all other VLANs to flood as well (just flood their own VLAN). ![]() Most switches today do not have separate tables for each VLAN. Why is this helpful? Broadcast packets will only occur within the same VLAN (Even they are on the same switch). You can group a number of ports on a switch together and say they are part of a VLAN (they are logically separated from other VLANs). What is the point of filling up switches table with fake make addresses? It forces the switch to become a hub (and you as an attacker can now see traffic on every port as all packets are now broadcasted) However many other switches will let their entire table get filled up with fake addresses! This is beneficial to you if you wish to receive traffic intended for other people! If you fill up a switches table with random mac addresses different vendors switches will behave differently.Ĭisco switches will keep original MAC address on its table and will only remove them if they time out. Today’s Lesson is on flooding a network with random MAC addresses. Before you can be a badass hacker you need to understand what exactly it is your doing. ![]()
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December 2022
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