![]() ![]() Know the configuration - You must know how a packet flow is supposed to be handled by the device in terms of:.ingress/egress), what is the device architecture and what are the various capture points Know the appliance - You must know how your device handles packets, what are the involved interfaces (i.e.If this is not possible you must at least know the upstream and downstream devices Know the topology - You must know the transit devices.Know the protocol operation - It is vain to start checking a packet capture if you do not understand how the captured protocol operates. ![]() Prerequisites RequirementsĬisco recommends that you have knowledge of these topics:Īdditionally, before you start to analyze packet captures it is highly advisable to meet these requirements: The document covers the packet captures from a Cisco Next-Generation Firewall (NGFW) point of view, but the same concepts are applicable to other device types as well. All the scenarios presented in this document are based on real user cases seen in the Cisco Technical Assistance Center (TAC). This document describes various packet capture analysis techniques that aim to effectively troubleshoot network issues. ![]()
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