open resolvers

Open resolvers are DNS servers that accept recursive queries from any client on the internet, making them a key vector in DNS amplification DDoS attacks. This tag covers discussions about the security risks posed by open resolvers, including how attackers exploit them to amplify traffic and overwhelm targets. Content highlights mitigation strategies such as restricting recursive queries to trusted clients, implementing rate limiting, and following best practices from advisories like TA13-088A. The focus is on protecting enterprise networks and DNS infrastructure from abuse by securing open resolvers against unauthorized use.