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可就是居心叵测了……樊哙这才明白过来，原来如此。However, in the world of iptables, The most commonly used matching condition is not "dignified", But the "source address", "destination address", "source port", "destination port" and so on of the message, In the world of iptables, The most commonly used actions are ACCEPT (Accept), DROP (Discard) and REJECT (Reject), of which ACCEPT is similar to the "Release" in our example. However, the matching conditions and actions we mentioned just now are not all, but the most commonly used ones. The specific matching conditions and actions are not the focus of our discussion today, and we will make a summary in future articles.欧洲伦敦，至高无上的尼古丁吸血鬼家族雄霸一方，建立了独立的吸血鬼王国，雄心万丈的吸血鬼王老古丁，利用忠实买通王友仁，设计诱惑大量华人进入吸血鬼城堡，企图把吸血鬼王国的力量渗透进亚洲……It is very convenient to detect SYN attacks. When you see a large number of semi-connection states on the server, especially the source IP address is random, you can basically conclude that this is a SYN attack. We use the netstat tool that comes with the system to detect SYN attacks:Attackers can use a large number of controlled machines to establish a large number of TCP connections with Target, making it unable to accept normal TCP connection requests, thus achieving the purpose of denial of service attacks.季木霖忽然说：我那天下手比较重，也跟你说声抱歉。不知道会持续到什么程度的深巨大的竖穴里，栖息着奇怪的生物们沉睡着现在人类无法创造的珍贵遗物。