Full packet capture is the recording of complete network packets so teams can inspect the contents and context of network communication in detail.
Full packet capture is the recording of complete network packets so teams can inspect the contents and context of network communication in detail. In plain language, it is the practice of keeping a detailed record of actual network traffic, not just summaries about that traffic.
Full packet capture matters because some investigations require more than metadata. Teams may need to understand exactly what systems communicated, when they communicated, and what kind of data or protocol behavior was involved.
It also matters because high-detail traffic data can help validate detections, reconstruct events, and compare suspicious behavior against expected patterns. At the same time, it raises storage, privacy, and handling considerations because detailed captures can contain sensitive information.
Full packet capture appears in network monitoring, threat hunting, forensic analysis, breach investigation, and high-value environment monitoring. Teams connect it to Network Telemetry, Deep Packet Inspection, Forensics, Indicators of Compromise, and Threat Hunting.
Security teams usually reserve full packet capture for environments where the extra detail justifies the cost and sensitivity of storing it.
A security team investigating suspicious outbound traffic uses full packet capture from a monitored network segment to confirm which host initiated the communication, which protocol was used, and whether the transfer matched normal application behavior or something more concerning.
Full packet capture is not the same as Network Telemetry in the general sense. Telemetry may include summaries, flow records, and alerts. Full packet capture stores the actual packets themselves.
It is also different from Deep Packet Inspection. Deep packet inspection is the act of examining packet content. Full packet capture is the practice of recording packets so they can be examined later or in greater detail.