Уровень 0 · материалов: 9
В кластер входят документы с техническими рекомендациями и методами защиты веб-ресурсов от DDoS-атак, включая защиту на уровнях L7 и DNS.
Общие признаки: методы предотвращения DDoS, настройка веб-серверов (Nginx, Apache, lighttpd), фильтрация трафика и блокировка IP, оптимизация ядра ОС для защиты ресурсов
Группа выше: DDoS-атаки и защита от них
Смысл: The main idea is to implement a layered defense strategy involving OS kernel optimization and dynamic IP banning based on Nginx connection limits to maintain website availability and SEO rankings during an HTTP DDoS attack.
A guide on using Linux kernel tuning and Nginx connection limiting to dynamically populate iptables blacklists to mitigate moderate HTTP DDoS attacks.
Смысл: The main idea is to protect a web server from massive HTTP DDoS attacks by implementing a layered architecture (lighttpd -> Varnish -> Backend) combined with aggressive kernel tuning and connection limiting.
Implement a frontend-backend architecture using lighttpd and Varnish caching along with kernel optimization to mitigate large-scale HTTP DDoS attacks.
Смысл: The main idea is that HTTP flood attacks can be effectively mitigated using the Nginx ngx_http_limit_req_module to rate-limit requests and a simple script to ban offending IPs at the firewall level.
The author demonstrates how to mitigate high-frequency HTTP flood attacks using the Nginx rate-limiting module and firewall automation.
Смысл: The text explains the nature of DDoS attacks and provides a set of practical recommendations for webmasters and administrators to protect their servers through Apache tuning, automated scripts, and firewall rules.
A technical guide providing Apache configuration tips and automation scripts to mitigate Distributed Denial of Service attacks.
Смысл: The main idea is to warn website owners about the vulnerability of their resources to DDoS attacks and to provide a basic roadmap for prevention and mitigation to avoid catastrophic downtime.
A guide for webmasters on recognizing, surviving, and preventing DDoS attacks based on the author's personal experience with site downtime.
Смысл: The text presents a specialized Nginx module that filters Layer 7 DDoS attacks by challenging clients to handle cookies, redirects, and JavaScript, effectively blocking simple bots from reaching the backend.
The author presents a custom Nginx module that mitigates HTTP flood DDoS attacks by using cookies, redirects, and JavaScript challenges to filter out bots.
Смысл: The main idea is to detect HTTP DDoS bots by identifying the absence of requests for static assets (the 'trap' method) and automatically blocking those IPs via a database-driven analysis script.
An experimental DDoS mitigation technique that blocks IPs requesting dynamic pages without loading corresponding static assets, implemented via Nginx, MySQL, and PHP.
Смысл: The text explains the mechanism of DNS amplification attacks and provides a technical solution for mitigating them on Linux servers using the iptables 'string' and 'recent' modules to filter and rate-limit malicious traffic.
A technical guide on identifying DNS amplification attacks and mitigating them using iptables deep packet inspection and rate limiting on Linux.
Смысл: The text describes a successful mitigation of a low-level extortion attempt and DDoS attack against an online store. The main idea is that many amateur attacks are predictable and can be stopped using basic server configuration and communication with Internet Service Providers.
A professional stops a low-level DDoS extortion attempt by filtering a specific User-Agent in .htaccess and contacting the attacker's ISP.