A fast-flux service network (FFSN) is a network infrastructure resultant of the fast-fluxed network of compromised hosts; the technique is also used by legitimate service providers such as content distribution networks (CDNs) where the dynamic IP address is converted to match the domain name of the internet host, usually for the purpose of load balancing using round-robin domain name system (RR-DNS). The purpose of using FFSN infrastructure for the botnets is to relay network requests and act as a proxy to the backend bulletproof content server which function as an "origin server".
