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A packet enters the ingress interface and it is handled by the chassis internal switch.In the case of a Firepower appliance (1xxx, 21xx, 41xx, 93xx) and a Firepower Threat Defense (FTD) application a packet processing can be visualized as shown in the image. How to Collect and Export Captures on the NGFW Product Family? The goal of this document is to help network and security engineers to identify and troubleshoot common network issues based mainly on packet capture analysis. Daily, Cisco TAC solves many customer problems by analyzing captured data.

Packet capture is one of the most overlooked troubleshoot tools available today. If your network is live, ensure that you understand the potential impact of any command. All of the devices used in this document started with a cleared (default) configuration. The information in this document was created from the devices in a specific lab environment.

Most of the scenarios are based on FP4140 running FTD software 6.5.x.

The information in this document is based on these software and hardware versions:

Know the available tools - Along with the captures it is recommended to be also ready to apply other troubleshooting tools and techniques like logging and tracers and if needed correlate them with the captured packets.

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.