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The same wireless LAN controller, or a different wireless LAN controller The same SSID on the same VLAN, or different SSIDs mapping to the same VLAN When there is a duplication of random addresses, a random MAC address duplication may occur. In a mobility event, the SSID is the same as the client moves networks. The new client goes through the normal onboarding process. The old client goes through normalĪging or no probing response detection and deletion. This case is treated as if the old client leaves the network and the new client joins.
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When enabling or disabling the random MAC address on the client, the SSID is the same and the client changes the MAC address To illustrate how the Layer 2 network treats random MAC address duplication behavior and impact, read the following cases: The Layer 2 network treats the random MAC address duplication with this same reactive measure. This reactive measure serves to detect and stop the access of the MAC address attacker. In a typical network, the control nodes may delegate the responsibility of MAC address duplication detection to First Hop Because the Layer 2 network cannot operate with MAC address duplication, the networkĭevices and controllers must manage the duplication. MAC address can exist in different VLANs. In bridged networks (Layer 2), we know that for a given VLAN the MAC address is used as a unique identifier, and this same General Considerations on Bridged Networks Is possible to have duplicate MAC addresses. This behavior is handled on the device side, but on rare occasion it Two different clients can have the same MAC address. If the client device clears the SSID by forgetting the network and then rejoins the same SSID, the client receives the sameĪ client device can have a maximum MAC address equal to the number of SSIDs in the network.ĭuplication of MAC addresses is possible. If the client rejoins the same SSID, the client receives the same MAC address that it had previously. The first time the client device joins the SSID, a new random
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The following bullets provide clarifying information about MAC randomization's impact on client devices:įor an end user device, the MAC address per SSID is maintained. For example, in 32:8c:27:26:72:34 the 2 in the first octet reveals this is a random MAC address. The b1īit determines if the MAC address is globallly or locally administered, and the b0 bit determines if the MAC address is aĪccording to the IEEE, to qualify as a random MAC address, the first octet (in hexadecimal notation) must end with a 2, 6,Ī, or E. Components include octets, bits, the OUI, and the NIC. Structural Elements of a MAC Addressįigure 1 displays the structural elements of a MAC address. For a MAC address to be considered a random MAC address, the MAC address must be locallyĪdministered (the b1 bit set as 1) and be a unicast address (the b0 bit set as 0).įigure 1. How the b0 bit identifies whether the MAC address is unicast or multicast and how the b1 bit identifies if the MAC address In Figure 1, you can see the 48-bit structure of a MAC address. The following diagram provides the foundational groundwork This generation of MAC randomization follows rules set by the IEEE.