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Cisco Catalyst switch models use a MAC address table for Layer 2 switching. When switch receives a frame, he looks in the MAC address table (sometimes called CAM table) for the destination MAC address. To understand the mechanism of a MAC address table overflow attack we must recall how does a switch work in the first place. MAC flooding attacks are sometimes called MAC address table overflow attacks. MAC address table in the switch has the MAC addresses available on a given physical port of a switch and the associated VLAN parameters for each. Configure the switches to limit the number of MAC addresses on the ports that are connected to the end stations.MAC address flooding attack is very common security attack.Authentication, Authorization, and Accounting Servers (AAA) can be used for authentication against MAC addresses as an preventive measures.To stay safe from this attack, follow the following: The hacker finally uses an packet analyzer to capture these packets to steal the sensitive information.Once the MAC address table is full, the network switch enters into the fail-open mode and behaves like a network hub, broadcasting all the packets on all the switch ports.In this attack, the hacker first connects to the switch ports and floods it’s interface by forcing legitimate MAC addresses out of the MAC address table through very large number of fake MAC addresses.The attack is used for forcing the legitimate MAC table contents out of the switch and forcing the unicast flooding behavior for potentially sending sensitive information to portions of the network where it is not normally intended to go. The hacker uses this attack to steal sensitive data that is being transferred in the network. In this attack the network is flooded with the fake MAC addresses. MAC (Media Access Control) Flooding is a type of cyber attack done in a network to compromise the security of the network switches.
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This means that any type of data that was intended for a single address is received by multiple addresses. Instead, any data that is intended for a single MAC address is now sent out on all ports associated with the network. This approach makes it possible to designate a specific and single point of termination for data sent across the network.īy flooding the switch with data packets, the translation table is thrown out of kilter and the connection between the ports and specific MAC addresses is destroyed. Each MAC address is associated with a physical port on the network switch. When functioning properly, the table will map each individual MAC address that is found on the network. The basics of MAC flooding begin with a corruption of the translation table that is part of the function of the network switch.
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MAC flooding inundates the network switch with data packets that disrupt the usual sender to recipient flow of data that is common with MAC addresses. The end result is that rather than data passing from a specific port or sender to a specific recipient, the data is blasted out across all ports. Essentially, MAC flooding inundates the network switch with data packets that disrupt the usual sender to recipient flow of data that is common with MAC addresses. MAC flooding is a method that can be used to impact the security protocols of different types of network switches.