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Denial of service attacks are illegal means of attack. Distributed denial of service attacks make a large number of seemingly legitimate requests to service providers, consuming or occupying a large amount of resources for a long time.RG1, …南雀国特在横水河与沧浪江交界处建了一座丽水城，并派军队防守。翘儿看着三人的样子，捂着胸口大笑起来：哈哈哈哈。That is to say, a total of false syn messages will occupy the TCP preparation queue for 63s, while the semi-connected queue defaults to 1024, which is different by system default and can be viewed by cat/proc/sys/net/ipv4/tcp_max_syn_backlog c. That is to say, sending 200 fake syn packets per second without any protection is enough to burst the semi-connection queue, thus preventing the real connection from being established and responding to normal requests. The end result is that the server has no time to ignore the normal connection request-denial of service.但尹将军也不是那种无的放矢的人，敢这么做那肯定是有些把握的。