MAC Filtering

MAC filtering controls network access by allow-listing or block-listing devices based on their Layer-2 MAC addresses, commonly on Wi-Fi access points and switches. It is trivially bypassed by MAC spoofing and so provides no real security on its own; meaningful access control requires 802.1X with EAP or, on Wi-Fi, WPA2/3-Enterprise.

Categories: Security ControlsThreats and AttacksFraud

MAC Filtering in context

Security controls in telecom span signaling firewalls (SS7/Diameter/GTP screening at the network edge), transport encryption (IPsec, TLS, PRINS), identity and access on OSS/BSS, and monitoring at both the packet and log level. Controls are audited against GSMA FS.11/FS.19/FS.20/FS.36 and, in Europe, NIS2 sectoral rules.

Telecom threats range from opportunistic SMS phishing and SIM swap to nation-state grade location tracking and lawful-interception abuse. The common thread is that most attacks exploit the inherited trust model of legacy signaling. SS7 and Diameter were designed for a closed operator community that no longer exists.

To place MAC Filtering in the wider telecom-security picture, review Mediation Device (Lawful Interception), CASB, HTTP/2 Security in 5G, LAN, CLI Spoofing and GSMA Open Gateway.

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