RFC 9797: Randomized and Changing Media Access Control (MAC) Addresses: Context, Network Impacts, and Use Cases, J. Henry, et al., https://www.rfc-editor.org/info/rfc9797#RFC To limit the privacy issues created by the association between a device, its traffic, its location, and its user in IEEE 802 networks, client vendors and client OS vendors have started implementing Media Access Control 1/4
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(MAC) address randomization. This technology is particularly important in Wi-Fi networks (defined in IEEE 802.11) due to the over-the-air medium and device mobility. When such randomization happens, some in-network states may break, which may affect network connectivity and user experience. At the same time, devices may continue using other stable identifiers, defeating the purpose of MAC 2/4
address randomization. This document lists various network environments and a range of network services that may be affected by such randomization. This document then examines settings where the user experience may be affected by in-network state disruption. Last, this document examines some existing frameworks that maintain user privacy while preserving user quality of experience and 3/4
network operation efficiency. This document is a product of the MAC Address Device Identification for Network and Application Services Working Group of the IETF. 4/4
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