Mitigating Slow HTTP Denial of Service Attacks on Nginx These attacks exploit the server’s resource allocation for each connection, consuming connection pools, workers, or memory. 1. Mitigation Strategies (Nginx Level Defense) 1. Limit Request Header and Body Timeouts Set reasonable timeout values to prevent long-term connection occupation. http { # Limit the time to read … Read more
ngx_http_limit_req_module The ngx_http_limit_req_module module limits the request processing rate based on the defined key value, particularly for rate limiting requests from a single IP. limit_req_zone Directive Sets up a shared memory zone to store state information and the number of exceeded requests based on the key; the key can include text, variables, or a combination … Read more
Linux Traffic Control Overview● Queueing Discipline (Qdisc): Defines the queuing strategy for packets, such as First In First Out (<span>pfifo_fast</span>) or Hierarchical Token Bucket (<span>HTB</span>).● Class: Forms a hierarchical structure combined with queueing disciplines to allocate bandwidth priorities (e.g., assigning high priority to real-time traffic).● Filter: Classifies traffic based on rules (such as IP address, … Read more