On-device Packet Capture

Junos devices support filtering and mirroring incoming and outgoing packets, sending those packets to the CPU, and saving them into a file. This feature, on-device packet capture, can help you with protocol and application analysis, debugging, troubleshooting, network forensics, audit trails, and network attack detection. On-device packet capture (or self-mirroring) sends the sampled copy to a CPU and writes the copy into a packet capture (.pcap) file. The process does not require you to use any device connected to your network device.