This guide compares five popular packet‑capture tools—Wireshark, Tcpdump, Charles, and mitmproxy—explaining their strengths, weaknesses, installation steps, filter syntax, and best‑use scenarios for developers and testers needing efficient network debugging.
This article walks through a systematic investigation of a web page that takes 2‑2.4 seconds to load, covering HAProxy configuration checks, network latency tests, TCP three‑handshake and packet‑capture analysis, and finally pinpointing MySQL connection handling as the root cause.
This guide explains how to use tcpdump for network packet capture, covering basic commands, filtering by interface, host, port, protocol, advanced examples, saving captures to files, and a practical troubleshooting scenario involving Nginx and a Node.js server.
This guide explains how to use tcpdump for network packet capture, covering basic usage, filtering by interface, host, port, protocol, advanced options, saving captures, and a real‑world troubleshooting scenario with Nginx and Node.js.
A colleague noticed a 15‑second pause between the first two ping replies to pop3.sina.net, prompting a deep dive with tcpdump, strace, and DNS tests that revealed the delay was caused by slow local DNS resolution rather than network latency.
This article explains various methods for capturing network packets on Android phones—including internal tcpdump, Fiddler via Wi‑Fi hotspot, and VPNService‑based APKs—describes their drawbacks, and presents a scalable architecture that copies Wi‑Fi traffic to a server for analysis using Go's gopacket library.
This article examines the difficulties of mobile H5 performance testing—including root‑required tcpdump, JavaScript injection, HTTPS pcap parsing, and white‑screen timing—provides background on mobile browsers, outlines performance metrics, compares four testing approaches, and describes a WebView monitoring workflow with data conversion and visualization.
This article examines the difficulties of automating mobile H5 performance testing—such as root‑required tcpdump, HTTPS pcap parsing, and ambiguous white‑screen timing—and presents background on mobile browsers, W3C performance metrics, and a comparative review of practical testing tools and a custom WebView monitoring workflow.
This article presents an automated approach for measuring and improving the performance of mobile H5 advertisements by capturing network traffic with tcpdump, injecting JavaScript to collect W3C Performance API metrics, converting pcap files to HAR, and visualizing results similar to Chrome DevTools.
The article presents a comprehensive, automated approach for measuring mobile H5 page performance—including start‑render, DOM‑ready, and page‑load times—by capturing network traffic with tcpdump, injecting JavaScript via the WebView, converting pcap files to HAR, and visualizing results similar to Chrome DevTools.
This guide explains how to use tcpdump for network packet capture, covering basic usage, filtering by interface, host, port, protocol, and advanced options for saving and limiting captures, with practical examples for troubleshooting network issues.
This article explains how to capture network traffic with tcpdump, parse the resulting PCAP file using Node.js (node‑pcap), extract HTTP request/response data and timing information, and convert it into HAR format for detailed H5 performance analysis.
This article provides a comprehensive guide to using tcpdump on Linux, covering command syntax, host and port filters, protocol selection, common and advanced expression syntax, TCP flag and fragment matching, and examples for capturing HTTP, SMTP, and SSH traffic.
This article guides operations engineers through tcpdump fundamentals, advanced filtering techniques, the design of an automated packet‑capture tool, and how to transform captured traffic data into a visual business architecture tree for efficient fault isolation and resource optimization.
This article shares practical game‑operation case studies using tcpdump and Wireshark, explains the underlying principles, and provides actionable tips for network troubleshooting, Wireshark configuration, tcpdump parameters, filters, and Android capture methods.
Tcpdump is a powerful command‑line packet sniffer for Unix‑like systems; this guide introduces its purpose, installation steps, essential command‑line options, filter expression syntax, and practical examples, enabling users to capture, analyze, and troubleshoot network traffic efficiently.
This article walks through a Linux routing experiment where misconfigured routes caused ARP failures, explains the root cause, and provides the correct routing commands and packet‑capture analysis that enable successful ping between two hosts through a Linux router.
