![]() It has a non‑blocking, event‑driven architecture that copes with huge amounts of requests without a noticeable increase in resource utilization. NGINX is designed to be a “shock absorber” for your site or application. Inherent Protection of the NGINX Event‑Driven Architecture These features address a DDoS attack both by regulating the incoming traffic and by controlling the traffic as it is proxied to backend servers. NGINX and NGINX Plus have a number of features that – in conjunction with the characteristics of a DDoS attack mentioned above – can make them a valuable part of a DDoS attack mitigation solution. Using NGINX and NGINX Plus to Fight DDoS Attacks ![]() The Referer header is sometimes set to a value you can associate with the attack.The User-Agent header is sometimes set to a non‑standard value.Because the traffic is generated by bots and is meant to overwhelm the server, the rate of traffic is much higher than a human user can generate. ![]() However, the number of connections and requests from a forward proxy is typically much lower than in a DDoS attack. The use of forward proxies can also create this pattern, because the forward proxy server’s IP address is used as the client address for requests from all the real clients it serves. Note: It’s important not to assume that this traffic pattern always represents a DDoS attack. As a result, each IP address is responsible for many more connections and requests than you would expect from a real user. The traffic normally originates from a fixed set of IP addresses, belonging to the machines used to carry out the attack. Because these attacks are carried out by bots rather than actual users, the attacker can easily open large numbers of connections and send large numbers of requests very rapidly.Ĭharacteristics of DDoS attacks that can be used to help mitigate against them include the following (this is not meant to be an exhaustive list): Other attacks can take the form of sending a large number of requests or very large requests. For example, for systems that don’t handle large numbers of concurrent connections well, merely opening a large number of connections and keeping them active by periodically sending a small amount of traffic can exhaust the system’s capacity for new connections. Application‑Layer DDoS Attack CharacteristicsĪpplication‑layer (Layer 7/HTTP) DDoS attacks are carried out by software programs ( bots) that can be tailored to best exploit the vulnerabilities of specific systems. Typically, the attacker tries to saturate a system with so many connections and requests that it is no longer able to accept new traffic, or becomes so slow that it is effectively unusable. Of course, in case you would be logging all resources of your site (images, css, js, etc), it would be really easy to get to those numbers as a normal user.A Distributed Denial‑of‑Service (DDoS) attack is an attempt to make a service, usually a website, unavailable by bombarding it with so much traffic from multiple machines that the server providing the service is no longer able to function correctly because of resource exhaustion. ![]() # 240 pages in 60 seconds, or 4p/s average, is suspicious) # Based on apache-badbots but a simple IP check (any IP requesting more than In our jail.local, we have (at the end of the file): If this regex matches, the line is ignored. # Notes.: Regexp to catch a generic call from an IP address. # Generated on Fri Jun 08 12:09: by BeezNest New filter in /etc/fail2ban/nf: # Fail2Ban configuration file
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