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In computer networking, a media access control attack or MAC flooding is a technique employed to compromise the security of network switches.The attack works by forcing legitimate MAC table contents out of the switch and forcing a unicast flooding behavior potentially sending sensitive information to portions of the network where it is not normally intended to go.
The mechanism for learning is identical to IEEE 802.1ah, in short, the corresponding outer MAC unicast DA, if not known is replaced by a multicast DA and when a response is received, the SA of that response now tells us the DA to use to reach the non-participating node that sourced the response. e.g. node 7 learns that C is reached by node 5.
In computer networking, a unicast flood occurs when a switch receives a unicast frame and the switch does not know that the addressee is on any particular switch port. Since the switch has no information regarding which port, if any, the addressee might be reached through, it forwards the frame through all ports aside from the one through which the frame was received.
Forwarding this type of traffic can create unnecessary traffic that leads to poor network performance or even a complete loss of network service. [6] This flooding of packets is known as a unicast flooding. [7] [5] Multicast traffic allows a host to contact a subset of hosts or devices joined into a group.
This generates a storm of replies to the victim host tying up network bandwidth, using up CPU resources or possibly crashing the victim. [ 3 ] In wireless networks a disassociation packet spoofed with the source to that of the wireless access point and sent to the broadcast address can generate a disassociation broadcast DOS attack.
SDB may require changes to the intermediate router configuration. SDBs are treated like unicast network packets until processed by the final (local) router. This router then broadcasts the packet using a layer-2 broadcast. This technique allows a broadcast to be initiated on a remote network but requires all intervening routers to forward the SDB.
Key management and the establishment of secure associations is outside the scope of 802.1AE, but is specified by 802.1X-2010.. The 802.1AE standard specifies the implementation of a MAC Security Entities (SecY) that can be thought of as part of the stations attached to the same LAN, providing secure MAC service to the client.
In computer networking, unicast is a one-to-one transmission from one point in the network to another point; that is, one sender and one receiver, each identified by a network address. [ 1 ] Unicast is in contrast to multicast and broadcast which are one-to-many transmissions.