Packet parsing: in-depth understanding

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network communication Packet parsing refers to the decomposition and analysis of packets in network transmission to obtain information such as source address, destination address, protocol type, data content, etc. Through packet parsing, we can understand the details of network communication, diagnose network failures, conduct security analysis, etc.  

Packet parsing tools Wireshark: The most popular network Email List protocol analyzer, powerful, supports multiple protocols, and can perform detailed analysis of captured packets. tcpdump: A command line tool used to capture network packets, filter and save packets. Fiddler: HTTP protocol debugging proxy, mainly used to analyze HTTP and HTTPS traffic. Charles: Similar to Fiddler, it can intercept, view, and modify HTTP and HTTPS requests. Steps of packet parsing Packet capture.




Use the above tools or other packet capture tools to capture packets in the network. Filtering: Filter the captured packets as needed, such as only displaying packets of specific IP addresses, port numbers or protocols. Analysis: Perform in-depth analysis of the filtered packets to view the meaning of each field. Decoding: Decode the data in the packet to restore the original data. Application scenarios of packet parsing Network fault diagnosis: By analyzing data packets, the causes of network faults can be located.