NAT (Network Address Translation)

Network Address Translation modifies the source or destination IP address (and often port) of packets crossing a boundary, most commonly to let multiple devices share a smaller pool of public addresses. NAT is ubiquitous in IPv4 networks; CGNAT extends it to carrier-grade scale. NAT complicates end-to-end addressability and complicates lawful interception and abuse attribution.

Categories: Radio Access NetworkThreats and AttacksOperations and Business

NAT in context

The radio access network is the layer where mobile devices attach to the operator's infrastructure. Attacks in this layer include IMSI catching, rogue base stations, downgrade attacks and jamming, and defenses hinge on mutual authentication, integrity-protected signaling and Open RAN supply-chain hygiene.

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 NAT in the wider telecom-security picture, review Lawful Interception Abuse Risk, MAC Address, Packet, RAN, Transcoding and Backhaul.

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