Packet

A packet is the basic unit of data transmitted across an IP network, comprising a header (with source and destination addresses and routing metadata) and a payload. IPv4 and IPv6 packets are the medium for nearly all internet, mobile data, IMS signalling, and 5G control-plane traffic. Per-packet inspection is the foundation of firewalls, IDS/IPS, and modern observability.

Categories: Radio Access NetworkSecurity ControlsOperations and Business

Packet in context

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

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

To place Packet in the wider telecom-security picture, review 1G, 2G, 6G, A5/0, AP and Authentication — each entry cross-references back to this page so you can walk the topic in either direction.

Related terms

More from the TelcoSec Glossary

Browse the full TelcoSec Glossary, the Ultimate Guide to Mobile Network Security, or the P1 Arsenal of telecom-security tools.