This guide explains the fundamentals of DNS, walks through installing and configuring a BIND DNS server on Linux (both Red Hat and Debian based), details zone definitions, record types, and essential commands for testing and troubleshooting the server.
This article explains the principle of HTTP pipelining, presents detailed performance tests comparing single‑thread, thread‑pool, and pipelined request methods, and provides a simple .NET implementation that demonstrates why pipelining can achieve ten‑fold speed gains over conventional HTTP keep‑alive.
This article explains the concept of HTTP pipelining, presents a series of performance tests comparing pipe, thread‑group, and asynchronous request methods on a typical PC, analyzes the results and underlying TCP behavior, and provides a simple .NET implementation for practical use.
This article provides a step‑by‑step tutorial for creating, configuring, and debugging JDReact projects—including project initialization, npm/yarn setup, styling conventions, routing, network requests, animation handling, scroll‑view tricks, H5 conversion issues, and deployment tips—while highlighting frequent Windows compatibility problems and practical solutions.
This article explains the principles, architectures, and trade‑offs of three popular software load balancers—LVS, Nginx, and HAProxy—guiding you to select the right solution based on traffic volume, protocol layer, and operational complexity.
The article investigates massive packet loss in Meituan‑Dianping's Redis service despite 10 Gbps NIC upgrades, traces the issue to kernel receive‑buffer drops and single‑CPU interrupt handling, and presents a step‑by‑step optimization using backlog tuning, CPU and Redis affinity, and NUMA‑aware placement to eliminate drops and improve latency.
This article examines the default retry mechanism of Apache HttpClient 4.5.5, explains how the RetryExec executor and DefaultHttpRequestRetryHandler work, details the conditions under which retries occur or are skipped, and shows how to disable automatic retries when building an HttpClient instance.
This guide walks you through the step‑by‑step process of fixing network configuration on a CentOS virtual machine after cloning it in vSphere, covering hostname changes, MAC address updates, interface file edits, persistent‑net rules, and service restart.
This guide walks through troubleshooting Ubuntu 14.04 network manager incompatibility, configuring campus network access, setting up an SSH server, adjusting Vim tabs, installing Java JDK, Maven, Zsh, and various utilities, plus tips for grub configuration, system monitoring, and software enhancements on an old machine.
This article walks you through deploying Flannel (host‑gw and VXLAN modes) and Calico (IP‑IP mode, RR deployment, and BGP configuration) on a Kubernetes cluster using systemd units, etcd backend settings, and detailed CNI configuration files, complete with troubleshooting tips and code snippets.
Through kernel‑level analysis we discovered that Redis packet loss stemmed from rx_dropped buffer exhaustion caused by interrupt‑handling backlogs, and resolved it by assigning NIC interrupts to specific cores on one NUMA node while binding Redis processes to the other, eliminating loss under dual‑10 GbE load.
This article translates hardware latencies—from CPU cache and memory to disk and network—into human‑scale time equivalents, using vivid analogies and benchmark data to illustrate why storage and networking appear extremely slow from the processor's viewpoint.
This article explains how misconfigured links in Dell blade server networks can create black‑hole failures, illustrates two fault scenarios, and provides step‑by‑step switch configuration techniques—including link‑dependency groups and uplink‑state groups—to ensure automatic NIC failover and maintain high availability.
The article examines the growing security challenges of the Internet of Things, outlines a four‑step methodology for protecting devices and data, and highlights the difficulties enterprises face in managing and verifying billions of connected endpoints.
The article describes how a company replaced costly commercial load balancers with an open‑source architecture based on Nginx for layer‑4 traffic and a layer‑7 cluster, detailing project background, technology selection, redundant design, network and Nginx configurations, operational scripts, performance testing, and data analysis.
This comprehensive guide explains how DNS translates hostnames to IP addresses, covers the role of /etc/hosts, details domain name components, describes the three DNS server types, and provides step‑by‑step instructions for installing BIND, configuring master, slave, and cache zones, as well as managing records, TTL, and common troubleshooting commands on Linux.
This article explains why traditional macro performance metrics are insufficient, introduces ten essential micro‑metrics covering memory, thread, and network aspects, and shows how to capture them using GC logs, thread dumps, and tools like netstat or open‑source APM solutions.
This guide explains Linux traffic control (TC), covering its core components—queueing disciplines, classes, and filters—along with HTB configuration, step‑by‑step command examples, burst handling, and practical use cases for limiting bandwidth per IP or subnet.
This article explains the evolution of storage, the shift toward cloud‑native storage solutions, and details the network architecture, latency considerations, and operational challenges involved in building dual‑active data center storage systems for high‑availability enterprise environments.
This comprehensive guide lists essential Python libraries for network operations, asynchronous programming, web crawling frameworks, HTML/XML parsing, text handling, data conversion, slug creation, office document manipulation, PDF processing, markdown rendering, YAML handling, CSS utilities, feed parsing, SQL tools, HTTP clients, microformats, executable analysis, PSD handling, natural language processing, browser automation, headless tools, multiprocessing, queues, cloud execution, email handling, URL manipulation, web content extraction, video downloading, wiki archiving, WebSocket communication, DNS queries, computer vision, proxy services, and miscellaneous utilities.
This guide walks developers through installing Whistle, configuring one‑click proxy switching, and using its powerful rule‑based features—host mapping, file replacement, request forwarding, script injection, mock responses, remote debugging, and HTTPS support—to streamline frontend network debugging.
This article walks through every step a browser takes to fetch and display a website—including DNS cache lookup, OS and ISP resolution, TCP handshake, HTTP request handling, and the rendering pipeline—while also clarifying core concepts such as callbacks, async vs sync, and the event loop.
The 2016 China Mobile App Performance Report, released by leading APM provider Tingyun, analyzes iOS and Android crash rates, network performance, error distributions, and third‑party API responsiveness, revealing that iOS apps crash five times more often than Android, network errors dominate failures, and certain industries suffer higher latency, offering developers data‑driven guidance to improve user experience.
This article provides a detailed introduction to data migration, explaining why and when it is needed, outlining its major challenges such as security, compatibility and downtime, and describing the four primary migration approaches—application, volume‑manager, network, and storage—along with common tools and technologies.
This guide walks you through fixing a Linux virtual machine that cannot connect to the internet by adjusting network settings, resetting virtual network defaults, and configuring the VM to use NAT mode with automatic DHCP, ensuring seamless browsing after a simple restart.
This article explains the fundamental principles, security considerations, and cloud‑native design of private cloud infrastructure, covering stability, scalability, redundancy, storage options, network architecture, authentication, encryption, resource pooling, SLA management, and example OpenStack designs to guide practical implementation.
Li Qiang, Operations Director at TianpiaoChe, shares the step‑by‑step transformation of a legacy e‑commerce infrastructure, covering network latency fixes, hardware re‑allocation, OS tuning, open‑source component upgrades, virtualization changes, and future plans, providing practical insights for large‑scale site operations.
This guide explains the fundamentals of DNS, walks through editing the /etc/hosts file, describes domain name components, details the three types of DNS servers, and provides complete installation, configuration, zone definition, record creation, and troubleshooting steps for a Linux BIND DNS server.
This article explains HAProxy’s role as a free, open‑source Linux load balancer, compares Layer 4 (TCP) and Layer 7 (HTTP) balancing, discusses SSL handling, and provides detailed installation and configuration steps—including package and source builds, global settings, defaults, and health‑check options.
This document provides a comprehensive set of Huawei router configuration commands covering system settings, SNMP, time, portal loading, security policies, ACL rules, user authentication, firewall zones, interface definitions, IP addressing, NAT, static routes, and user interface configurations.
This article breaks down 5G for everyday users, illustrating how high bandwidth, dense connectivity, wide coverage, ultra‑reliable links, and massive device support translate into practical scenarios like seamless VR gaming, uninterrupted streaming in crowds, autonomous driving, remote robotics, and smart‑home IoT.
This article explains how mobile network characteristics, the one‑second rule, and targeted optimizations in access scheduling, protocols, and business logic can dramatically improve download success, startup speed, and overall user experience for mobile services.
Meituan’s self‑developed MGW replaces LVS with a DPDK‑based four‑layer load balancer that handles tens of gigabits per second and millions of concurrent connections by eliminating interrupts and locks, isolating control and data planes, and providing OSPF‑ECMP clustering with seamless failover and session synchronization.
This article explains how Docker containers are managed within Kubernetes clusters using the Flannel component, detailing its interaction with etcd to allocate unique subnet ranges for each minion node, configuring flanneld, and troubleshooting common networking issues.
This article provides a detailed, step‑by‑step guide for iOS developers on measuring and optimizing app performance across CPU usage, GPU‑related stutter, network conditions, and energy consumption using built‑in Instruments, Activity Monitor, Network Link Conditioner, and Charles.
This guide explains DNS fundamentals, resolution and query types, zone and resource record structures, master‑slave architecture, and provides step‑by‑step instructions for installing, configuring, and testing BIND on CentOS systems.
This article details a troubleshooting case on an AR2240 device where policy routing and NAT redirection prevented an internal host from reaching a server via a public IP, explains the root cause of missing ACL rules, and provides the configuration changes that resolved the issue.
This article outlines comprehensive mobile performance testing practices for Baidu Video, covering background, key performance dimensions such as smoothness, crash, memory, power, CPU, and network, and detailing metric collection methods on Android and iOS using command‑line tools, Xcode Instruments, and third‑party utilities.
This article presents a detailed technical guide on optimizing Android applications across UI smoothness, memory management, network efficiency, power consumption, and code structure, illustrating practical tools, metrics, and real‑world case studies from Ctrip’s large‑scale mobile platform.
This article presents a detailed overview of mobile app performance optimization, covering UI responsiveness, memory management, network efficiency, power consumption, and code improvements, with practical analysis methods, tools, and case studies from major companies such as Ctrip and Alibaba to help developers enhance Android applications.
This guide explains why the Huawei router reports a missing configuration file when resetting saved-configuration, shows how to inspect startup files, use a startup saved-configuration command to prevent the error, and confirms that the factory configuration matches the current settings after reboot.
This guide details step‑by‑step configuration of ACL and static NAT on the web interface for same‑subnet and different‑subnet scenarios, explains a VPN routing problem on an AR2200 LAC, identifies the NAT‑related root cause, and provides the corrective actions.
The article explains how to use the 'display interface brief' command to view interface status, interpret various state symbols, read input/output utilization percentages, and calculate actual traffic rates for each interface on a network device.
The article explains how a missing arp broadcast enable command on an AR1200 sub‑interface creates a black‑hole route that prevents internal PCs from reaching the internet, and shows the step‑by‑step troubleshooting and configuration fix to restore connectivity.
The login repeatedly reported a password error despite correct credentials because the user was configured with service-type web, which requires WEB authentication; changing the service-type to http corrected the issue and allowed successful login.
The article provides a detailed technical analysis of WeChat's communication protocol, describing its SYNC‑based state synchronization, short and long connection designs, packet structures, SyncKey handling, multi‑device login, and differences between mobile and web clients, offering insight for developers and engineers.
This comprehensive guide walks through HAProxy's version landscape, connection and closing modes, load‑balancing algorithms, persistence, content routing, header rewriting, multiple configuration examples—including dynamic and multi‑process setups—and practical debugging tips, supplemented by a live Q&A session.
This article explains why accessing an internal web server via its public NAT address fails, analyzes the current Huawei router configuration, and provides step‑by‑step NAT and ACL adjustments along with alternative access methods to resolve the issue.
This article explains the architecture of Linux Virtual Server (LVS) load balancers, detailing the roles of the Director server, Real servers, shared storage, and the three primary IPVS scheduling modes—DR, NAT/FULL NAT, and TUN—including their mechanisms, advantages, and configuration considerations.
This article explains common load‑balancing algorithms—including round‑robin, random, least‑connections, source‑IP hash, and weighted methods—describes their advantages and drawbacks, and examines hardware load‑balancing devices such as F5 and A10, covering functional, performance, stability, security, and cost considerations.
This article compares five open‑source monitoring solutions—Cacti, Nagios, Zabbix, Centreon and Ganglia—explains how to design a unified operations monitoring platform, and provides step‑by‑step instructions for installing and configuring Ganglia on Linux, including management, client, web UI setup, extensions, and best‑practice considerations.
This comprehensive guide walks Android developers through Retrofit’s fundamentals, usage patterns, URL configuration, parameter handling, custom converters, call adapters, and advanced techniques like file uploads, mock servers, and RxJava integration, providing code examples and deep insights to master network requests efficiently.
This guide explains Linux traffic control (TC), covering its core components, queueing disciplines, classes, filters, burst parameters, and provides step‑by‑step command examples to limit download speeds for individual IPs or subnets.
This article explains how Swoole's heartbeat feature works, why it is needed to detect dead TCP connections, and provides configuration tips for reliable asynchronous PHP server management.
This article provides a comprehensive overview of software load balancing, detailing the architecture, features, performance characteristics, and various load‑balancing strategies of Nginx, LVS, and HAProxy, and explains how to choose and deploy them in different scenarios.
This guide outlines practical steps to identify and resolve slow website issues by checking network health, optimizing front‑end resources, and tuning back‑end services such as servers, PHP, and databases, offering concrete tools and best‑practice recommendations.
HTTPS enhances privacy and prevents traffic hijacking but introduces additional network round‑trip times and cryptographic computation, which can increase page load latency by several RTTs and tens of milliseconds, especially on first‑time connections, affecting overall user experience.
This article outlines seven practical strategies—including monitoring, network upgrades, caching, task grading, lazy loading, page structure refinement, and image download optimization—to significantly improve the launch speed, home page responsiveness, and cart performance of the Mobile Taobao application.
This guide details the steps to export a configuration file from a Quidway switch using TFTP and to identify the IP address assigned to a specific MAC address on an S5700 switch by querying the ARP table.
The 2015 SACC conference highlighted numerous hidden challenges in building Internet+ network infrastructure—including cloud host, DNS, CDN, IP database, and BGP issues—providing practical insights for architects and IT professionals to avoid costly mistakes.
This article examines website performance by breaking down the user request journey into three paths—client, network, and server—offering practical optimization techniques such as DNS prefetch, caching strategies, CDN deployment, and outlining essential metrics like response time, concurrency, and throughput.
This guide provides detailed commands to configure a switch for user access VLANs, set up a firewall as both a layer‑3 and layer‑2 device with VLAN interfaces, DHCP/DNS, security zones, static routing, and NAT to enable internal users to reach external networks.
This guide explains how to remove a static IP binding, clear ARP caches, and perform network checks such as loop detection, CPU usage monitoring, and log inspection to resolve persistent IP usage errors on Huawei equipment.
This article explains the fundamentals of load balancing, introduces Linux Virtual Server (LVS) and its architecture, and provides a step‑by‑step guide to set up a DR‑mode LVS cluster with Keepalived on CentOS, including configuration, testing, and failover verification.
This guide demonstrates how to use the "clear configuration this" command in interface view to remove all configurations from a network interface, restore default settings, and handle the resulting shutdown state, including example CLI steps and expected output.
This article explains the structure of HAProxy configuration files, detailing the five sections—global, defaults, frontend, backend, and listen—along with key directives such as daemon, maxconn, mode, timeouts, bind, and server, and shows how they work together to manage traffic and monitoring.
This article lists and explains ten Cisco IOS service subcommands—including service dhcp, service linenumber, service password-encryption, service nagle, and others—detailing their functions, typical usage scenarios, and security considerations for configuring routers and switches.
This tutorial introduces the command‑line interface, explains key terminology, demonstrates Bash prompt customization, shows how to navigate and manipulate files, manage I/O redirection and permissions, and provides practical examples of common Unix commands such as cat, grep, pipe, sed, and network utilities.
The article details Ctrip's mobile app network service architecture, explaining native TCP and hybrid HTTP communication, describing common performance issues such as DNS, TCP, payload size, and presents six optimization practices—including DNS caching, quality detection, priority handling, retransmission, payload reduction, and overseas network improvements—to achieve higher success rates and lower latency.
This guide shows how to configure traffic statistics on two switches by creating ACLs, traffic classifiers, behaviors, and policies, applying them to specific GigabitEthernet interfaces, and finally displaying the traffic policy statistics from the command line.
This guide explains how to delete a static DHCP binding on Huawei's GigabitEthernet 0/0/2 interface, troubleshoot the "static‑MAC user" error, and verify the removal using CLI commands such as undo, reset, and display.
The article explains how web front‑end optimization, including static site generation, relies on improving browser‑server performance by addressing CPU, storage, and especially network bottlenecks, and argues that front‑end engineers should view themselves as browser‑application experts rather than just HTML/CSS/JS coders.
This guide explains how to use SSH local port forwarding to create a fast, secure bridge between distant data centers, allowing you to access slow remote services through a fast intermediary server and even transfer files via SCP over the tunnel.
This guide explains how to set the system name, configure the Ethernet management interface, assign an IP address, and enable Telnet with privileged access and AAA authentication on Quidway network equipment, including notes on chassis versus box port differences.
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.
Tcpcopy is a distributed online pressure testing tool that copies live traffic to test machines, enabling realistic simulation of production environments without deploying new code, and the article explains its principles, code details, deployment steps, advanced usage, and real‑world application at Yitao.
