dnsguard是一种高性能DoS攻击检测和防护工具。它可以监听以太网上的ip协议数据流，分析其中是否有DoS攻击，当发现了DoS攻击，dnsguard会自动向F5交换机发出指令，删除该攻击者的连接，并在一段时间内禁止其访问。dnsguard有效的防止了DoS攻击对服务器造成的危害，保证服务器的正常运作。-dnsguard is a high-performance DoS attack detection and prevention tools. It can monitor ip on the Ethernet protocol data flow analysis of whether DoS attacks, When it is discovered that the DoS attacks, dnsguard automatically switches to F5 issued a directive deletion of the attacker connectivity, and over a period of time against his visit. Dnsguard effective prevention of DoS attacks on the harm caused servers to ensure the normal operation of the server.