This article explains DNS fundamentals, the step‑by‑step resolution process, TTL caching, and how DNS‑based Global Server Load Balancing (GSLB) can direct traffic to the nearest active data‑center, providing a practical guide for building multi‑active, high‑availability infrastructures.
This technical report presents an IPv6 adoption overview, global deployment status, operating‑system and application IPv6 support, and a series of DNS and network‑stack tests—including dual‑stack scenarios, code examples, and conclusions on best practices such as using getaddrinfo over gethostbyname.
The Ministry of Industry and Information Technology approved the establishment of four DNS root server mirrors in China, outlining strict operational, security, and reporting requirements while highlighting the broader context of the nation’s IPv6 "Snowman" initiative and its impact on global internet governance.
Learn how to install, configure, and maintain a private BIND DNS service on CentOS 7, covering server roles, ACLs, forward and reverse zones, zone files, firewall settings, testing with nslookup, and ongoing DNS record management for a secure internal network.
This article explains how to replace Java's default DNS resolver with a custom NameService, disable DNS caching, and manipulate DNS entries at runtime using reflection, enabling flexible, environment‑agnostic automated test cases without hard‑coding IP addresses.
This article walks through the essential concepts of DNS and HTTP, detailing how a browser resolves a domain name to an IP address via recursive and iterative queries and then retrieves web content through HTTP request and response cycles, complete with diagrams and command examples.
YouZan’s Mobile Assistant combines Android VpnService (or iOS NetworkExtension) with the open‑source ZanProxy, using tun2socks‑based SOCKS5 tunneling, UUID‑based user isolation, and an ACL‑driven fake‑DNS scheme to replace complex Charles/hosts setups with a single‑click, certificate‑only, PC‑free environment‑switching solution supporting TCP, UDP, and WebSocket traffic.
This article explains the principles, advantages, and limitations of various load‑balancing techniques—including HTTP redirection, DNS‑based balancing, reverse‑proxy, LVS‑NAT, LVS‑DR, and LVS‑TUN—while providing practical Linux commands and configuration examples for building scalable systems.
DNS, the Internet’s core naming system, translates human‑readable domain names into IP addresses; this article explains its fundamentals, the multi‑step query process shown with the dig tool, server hierarchy, record types, security concerns, and handy command‑line utilities for inspection.
Load balancing distributes incoming traffic across multiple servers to improve performance, ensure high availability, and enable scalability, and this article explains its core principles, various classifications such as DNS, IP, layer‑2 and hybrid methods, and common algorithms like round‑robin, least connections, hash and weighted distribution.
This article explains the concept of load balancing, compares DNS, hardware, and software based solutions, and details common balancing algorithms such as round‑robin, load‑aware, response‑time, and hash strategies for building high‑performance server clusters.
Alibaba Cloud DNS senior engineer Guo Chuan, the sole Chinese participant selected for the ICANN64 Talent Program, delivered a keynote on DNS practice, highlighted stability and security challenges, discussed DoH/DoT, DNSSEC, IoT impacts, and emphasized collaborative governance for a resilient global internet infrastructure.
This guide explains the purpose of DNS, the role of the /etc/hosts file, the different DNS record types, and provides step‑by‑step instructions for installing BIND on Linux, configuring master, slave and cache servers, and managing zones and records.
Anycast assigns a single IP to multiple distributed DNS nodes, automatically routing queries to the nearest healthy server, which balances load, mitigates DDoS, and provides sub‑second failover; iQIYI’s internal tests confirmed UDP and TCP compatibility, enabling a self‑healing DNS deployment across data centers that cuts operational complexity and prepares for broader service use.
Google Public DNS now fully supports DNS over HTTPS, enhancing privacy and security with minimal performance impact, while the article explains why DNS needs encryption, how DoH works, browser support, and practical considerations for adoption.
This article provides a comprehensive guide to DNS, covering its purpose, hierarchical query process, server roles, record types, and practical command‑line tools like dig, host, and nslookup, enabling readers to fully understand and troubleshoot domain name resolution.
This article explains DNS fundamentals, the impact of incorrect local DNS on user experience, outlines recursive and authoritative DNS roles, describes domain hierarchy, and provides a practical overview of BIND server setup, its configuration files, and sample zone definitions with dig query results.
To combat carrier DNS hijacking and latency, Baidu App implements a comprehensive HTTPDNS solution that replaces system DNS with secure, BGP‑routed queries, adds layered strategies for disaster recovery, caching, IP selection, and integrates custom modules into Android’s OkHttp and iOS’s Cronet, dramatically lowering hijack rates while modestly improving response times.
This article explains the concept of load balancing, compares HTTP redirection, DNS‑based balancing, reverse‑proxy solutions, and Linux Virtual Server techniques (LVS‑NAT, LVS‑DR, LVS‑TUN), detailing their mechanisms, advantages, limitations, and practical configuration commands for building scalable, high‑performance server farms.
The article explains step‑by‑step what occurs when a user types a URL, covering DNS resolution, browser caching, HTTP requests and redirects, server processing, HTML generation, resource fetching, compression, and asynchronous AJAX communication, using Facebook as a concrete example.
This article details Ant Financial's progressive Service Mesh migration plan, explaining the challenges of moving massive legacy applications to Kubernetes and Istio, the evaluated evolution routes, key migration practices like network continuity and DNS-based addressing, and the implementation of custom CoreDNS plugins for dynamic DNS updates.
This article walks through the complete journey of a web request—from entering a URL, DNS resolution, TCP three‑way handshake, HTTP request and response, to the browser’s parsing, layout, and painting processes—explaining each step and the underlying protocols in clear detail.
This article walks through the complete lifecycle of a web request—from entering a URL, DNS resolution, and HTTP communication, to server processing, HTML delivery, resource fetching, and AJAX interactions—explaining each step with diagrams and code examples.
This article presents a DNS‑based universal addressing solution that enables traditional SOA applications using interfaces such as Dubbo, HSF, and SOFA to run on a Service Mesh without code changes, by mapping interface names to Kubernetes ClusterIP through CoreDNS and leveraging Istio’s routing mechanisms.
This article explains the concept of load balancing, compares DNS‑based, hardware‑based, and software‑based solutions, and details common balancing algorithms such as round‑robin, load‑aware, response‑time, and hash strategies, highlighting their advantages, limitations, and typical use cases in high‑traffic systems.
This guide explains why GitHub access can be slow due to CDN blocking and provides step‑by‑step instructions for Windows 10 users to download a custom hosts file, modify the system hosts entry, flush DNS, and refresh the browser to improve connection speed.
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 fundamental differences between GET and POST requests, the dual TCP/UDP usage of DNS, the meaning of idempotence, the contrast between cookies and sessions, causes and solutions for TCP packet fragmentation, the three‑way handshake and four‑way termination, the complete HTTP request flow, long‑connection handling, TCP reliability mechanisms, detailed HTTP structure, the distinction between URI and URL, and how HTTPS secures data transmission.
This article describes Qunar's automated network outage detection and intelligent traffic switching system, detailing the problem background, solution architecture, component functions, workflow, optimization steps, and future plans for more precise, multi‑level failover handling.
This guide explains the fundamentals of DNS, how hostnames map to IP addresses, and provides step‑by‑step instructions for installing BIND on Linux, configuring master, slave, and cache servers, defining zones, and managing common DNS record types.
Meitu’s Android DNS SDK combines LocalDNS and HTTP DNS in a hybrid strategy, transparently replaces the system resolver via reflection and native hooks, and dynamically switches to HTTP DNS on anomalies, cutting lookup latency by about 100 ms, boosting cache hit rates and overall request success while preventing DNS hijacking.
This article explains DNS fundamentals, detailing how domain names are resolved to IP addresses, the multi‑step query process shown with the dig tool, the hierarchical server architecture, record types, and additional utilities, enabling readers to fully understand and troubleshoot DNS operations.
This article presents the design, DPDK‑based implementation, performance optimizations, and test results of KDNS—a C‑language DNS server that replaces ContainerDNS's Go server, achieving near line‑rate processing, high availability, and significant latency improvements over traditional bind9 solutions.
This guide explains how to create a personal CDN by deploying multiple edge servers, using Geo‑IP‑aware DNS routing, leveraging Amazon Route 53 latency‑based routing, synchronizing content, handling SSL with Let’s Encrypt, and evaluating performance across continents.
This article explains how computers exchange data packets over the Internet, covering MAC and IP addressing, subnet determination, static and dynamic IP configuration via DHCP, DNS resolution, and the step‑by‑step construction of TCP, IP, and Ethernet frames for a web request.
This guide explains why a custom CDN can outperform commercial services, walks through using geo‑aware DNS, BGP Anycast limitations, setting up edge servers, distributing static content, handling SSL certificates, and shares real‑world performance results and lessons learned.
The article explains Chrome's guiding principles, multi‑process architecture, network request lifecycle, and a suite of performance optimizations—including DNS pre‑fetch, TCP pre‑connect, caching strategies, and predictive pre‑rendering—that together reduce latency and make the browser faster as users continue to browse.
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 details Meitu's comprehensive DNS optimization for Android apps, comparing LocalDNS and HTTP DNS, describing metric‑driven strategies, caching mechanisms, and a non‑intrusive SDK that works in both Java and native layers while handling HTTP, HTTPS, and SNI challenges.
This article explains the concept of load balancing, compares HTTP redirection, DNS load balancing, reverse proxy, and various LVS methods (NAT, Direct Routing, IP Tunnel), discusses their advantages, limitations, configuration steps, and practical considerations for building scalable server architectures.
This article explains the complete web request lifecycle, breaks down each latency component, and details how various cache layers—from browser DNS caches to server‑side memory and disk caches—can be leveraged and tuned to dramatically speed up page loads.
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.
This article walks you through the fundamentals of DNS, explains the role of /etc/hosts, describes the three types of DNS servers, shows how to install BIND on Red Hat or Debian systems, and provides detailed configuration examples for master, slave, and cache zones along with essential record types and troubleshooting commands.
The article explains how salt‑minion’s DNS resolution can become stale after a data‑center migration because each Linux process caches resolver settings in a private _res structure initialized by glibc’s res_init(), and it offers practical ways to force a refresh or redesign the lookup mechanism.
This article explains the concept of load balancing beyond simple equal distribution, comparing HTTP redirection, DNS‑based balancing, reverse‑proxy methods, and various Linux Virtual Server (LVS) approaches—including NAT, direct routing, and IP tunneling—highlighting their mechanisms, advantages, limitations, and practical configuration commands.
This article examines whether the ‘www’ subdomain is still necessary in 2023, discusses DNS and cookie implications, and provides practical Apache and Nginx rewrite rules for handling www‑to‑non‑www (and vice versa) redirects while considering SSL and SEO impacts.
This guide walks through setting up a LAMP stack, configuring a DNS server, creating virtual hosts, and deploying a Discuz! forum, covering each step from package installation to database configuration and final testing.
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 the concept of load balancing, compares HTTP redirection, DNS‑based balancing, reverse‑proxy methods, and Linux Virtual Server techniques (LVS‑NAT, LVS‑DR, LVS‑TUN), detailing their mechanisms, performance trade‑offs, configuration commands, and practical deployment considerations for scalable server infrastructures.
This article explains various load‑balancing techniques—including HTTP redirects, DNS‑based balancing, reverse‑proxy solutions, and Linux Virtual Server methods (LVS‑NAT, LVS‑DR, LVS‑TUN)—detailing their principles, advantages, limitations, and practical configuration commands.
Learn how to use key Linux networking tools—including ifconfig, host, nslookup, route, and traceroute—to display interface details, query DNS, view routing tables, and trace packet paths, with practical examples, screenshots, and tips such as MAC address spoofing and interface listing.
This article explains the principles of load balancing, distinguishes stateless service and stateful data balancing, describes DNS, hardware and software solutions such as F5, HAProxy, LVS, and GSLB, and illustrates real‑world implementations at Alibaba and Tencent while offering practical guidance on sharding, caching, and fault tolerance.
This article explains how to improve service availability and optimal user routing by comparing traditional DNS‑based access with advanced techniques such as smart DNS, smart routing, CDN multi‑point access, and global server load balancing (GSLB), highlighting their advantages, drawbacks, and practical deployment considerations.
When a Saturday early-morning outage left the company’s website and mobile app inaccessible for many users, the team traced the issue to an unpaid domain causing DNS resolution failures, detailed the investigation steps, temporary fixes, and lessons learned about DNS processes and operational readiness.
A detailed post‑mortem recounts how a forgotten domain renewal caused a DNS outage, the frantic troubleshooting steps across teams, temporary work‑arounds like switching to Google DNS, and the lessons learned for future incident management.
This article explains the architecture and challenges of network‑based scheduling systems, CDN and DNS‑driven video playback, the structure of the QQWry IP database, and proposes efficient IP‑based routing and quality‑monitoring methods for large‑scale backend services.
This article explains what GSLB (Global Server Load Balancing) is, why achieving high availability, low latency, and accurate traffic distribution is difficult due to DNS limitations, caching, and routing constraints, and explores architectural and network‑level techniques such as feedback loops, anycast, and BGP routing to mitigate these challenges.
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, based on Li Meng’s 2016 Shanghai Global Operations Conference talk, examines CDN DNS deployment and optimization from a developer’s perspective, covering DNS architecture, NS clustering, BIND selection algorithms, RTT-based weighting, error penalties, and practical guidelines for achieving compatible, fast, and efficient DNS solutions.
A roundup of recent tech developments covering a massive US DNS outage caused by IoT‑based DDoS attacks, Apple’s addition of ARM support to macOS Sierra, Google’s evolving 20% time policy, new multi‑data‑center features in Confluent Kafka, MariaDB’s new member, a critical OpenSSL flaw, China Mobile’s OpenStack award, and Tencent’s rapid Nexus 6P hack.
The article argues that blockchain, rather than IoT, underpins the IoT era and explores application scenarios such as device address assignment, IBM's ADEPT system, supply‑chain cost reduction, QR‑code delivery verification, and a blockchain‑based DNS service for secure, low‑cost public networking.
This article explains the complete journey of a web request—from DNS lookup and TCP handshake through HTTP exchange, server processing, and browser rendering—while highlighting optimization techniques and the roles of front‑end and back‑end engineers.
Twitter’s widgets.js, serving 300,000 requests per second, uses a carefully engineered deployment pipeline that emphasizes instant rollbacks, progressive rollouts, and real‑time visibility through DNS routing, CDN distribution, and origin management to minimize risk and ensure reliability.
This article walks readers through practical techniques for identifying and resolving common “unavailable” app problems—such as white screens, slow loading, or error codes—by using the lightweight Ping&DNS Android tool to check domain names, IP connectivity, DNS resolution, and traceroute data, empowering both novice users and professionals.
This talk explains how Lianjia redesigned its MySQL high‑availability setup by replacing VIP‑based failover with a Zookeeper‑driven naming service, detailing the original MHA architecture, its shortcomings, the new components, workflow, operational challenges, and a DNS‑based refinement.
This article explains the fundamentals of load balancing, compares common techniques such as DNS round‑robin, hardware and software load balancers, discusses their advantages and drawbacks, and introduces Alibaba's VIPServer as a mid‑tier, seven‑layer load‑balancing solution with advanced health‑check and traffic‑routing features.
This guide explains a UK project’s requirements for displaying a non‑public domain on the portal authentication page, using Huawei Access Controller to provide local DNS resolution, DNS relay, and dynamic DNS configuration, along with step‑by‑step configuration details and verification procedures.
This article explains how DNS hijacking and dynamic NAT can cause cross‑operator network slowdowns, illustrates real‑world examples, and presents practical solutions such as httpDNS and flow‑302 redirection to improve connectivity and user experience.
When logging into a Linux server via SSH, users may experience a ten‑second pause after entering the username because the server performs a reverse DNS lookup on the client IP, which can be resolved by disabling UseDNS or adding the appropriate PTR record.
A critical heap‑based buffer overflow in glibc's getaddrinfo() DNS resolver (CVE‑2015‑7547) can let attackers execute remote code on Linux systems, affecting most distributions that use glibc 2.9 or newer, and the article explains the bug, its impact, and mitigation steps.
This guide explains how to register and bind domain names, use DNS tools like dig and nslookup to query records, trace resolution paths, and identify common DNS issues such as domain squatting, hijacking, and spoofing, providing practical security insights.
From typing a URL to rendering a page, this article walks through each step—browser DNS lookup, HTTP request and response, redirects, server processing, content delivery, and asynchronous calls—revealing the complex interactions that make modern web browsing possible.
Ctrip's wireless development team shares a comprehensive overview of their app's network architecture, common performance pitfalls such as DNS and TCP issues, and a series of practical optimizations—including DNS caching, quality detection, priority handling, retransmission, payload reduction, and protocol upgrades—that dramatically improved service success rates and reduced latency.
The article explains how OS command injection can be leveraged for blind data exfiltration and demonstrates practical techniques using tools such as Netcat, cURL, Wget, SMB, Telnet, ICMP and DNS, along with preventive measures to mitigate such vulnerabilities.
This guide explains how email systems work—from DNS MX record lookup and server roles like MUA, MTA, MDA, and MRA to the detailed steps of sending, receiving, authentication, encryption, and spam filtering—providing operations engineers with a comprehensive understanding of mail infrastructure.
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 explains why DNS resolution slows down mobile app traffic, compares the traditional PC‑era HTTP flow with wireless app challenges, and presents a DNS‑free optimization that uses a locally cached IP list to improve latency, load balancing, and resilience.
This article walks through every step that occurs when you type a URL— from the browser’s DNS lookup and HTTP request, through server processing, redirects, HTML rendering, and subsequent resource and AJAX calls—revealing how browsers, servers, and CDNs cooperate to deliver a web page.
Load balancing distributes traffic across multiple servers using techniques such as HTTP redirects, reverse‑proxy (layer‑7) routing, IP‑based (layer‑4) balancing, and DNS round‑robin, each with distinct advantages and drawbacks regarding performance, scalability, configuration complexity, and fault tolerance.
This article explains how Tencent Cloud’s Dayu service mitigates large‑scale DDoS and CC attacks, using DNS redirection, traffic scrubbing nodes, and rapid 5‑second cleaning to keep services like Hammer Technology online during massive traffic spikes.
This guide introduces the dig command, explains its basic usage, advanced options, query types, TCP mode, domain defaults, trace functionality, and output simplification, providing practical examples for effective DNS troubleshooting and analysis.
This comprehensive guide explains the architecture and workflow of email systems, covering DNS MX record lookup, the roles of MUA, MTA, MDA, MRA, authentication mechanisms, encryption, and spam/virus filtering, providing operators with essential knowledge to manage and secure mail services.
This guide walks through preparing three hosts, setting up DNS server ACLs, defining BIND views, editing zone files, and testing to ensure the server replies with different IP addresses based on the requesting client.
The article details Ctrip's mobile app network architecture, common performance bottlenecks such as DNS, TCP, and payload issues, and presents six practical optimization techniques—including DNS caching, network‑quality detection, service prioritization, retry mechanisms, payload compression, and overseas CDN improvements—that collectively reduced latency by 150‑200 ms and raised service success rates above 99 %.
This article presents a comprehensive, production‑ready server naming convention that combines memorable word lists, geographic and environment tags, purpose codes, and serial numbers, offering clear DNS A and CNAME records to simplify management, automation, and scalability across large data centers.
This article reviews a range of free DNS providers—including registrar‑offered options, popular Chinese services, and overseas solutions—highlighting their features, limitations, and suitability for websites operating in China.
