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If an attacker sends a large number of SYN requests with fake source addresses, the server side will consume a lot of resources to handle this semi-connection, and saving traversal will consume a lot of CPU time and memory, not to mention retrying SYN + ACK on IP in this list. The end result is that the server has no time to ignore the normal connection request-denial of service. If you look at the SYN_RECV status on the server with the netstat-an command, you can see that there are a large number of connection states that are "SYN_RECEIVED"鲜血飞溅，宋义的头颅滚出好远，眼睛睁的大大的，流露出太多的恐惧与惊讶。Article 14 Confronted situationsAmazon宣布续订奇幻剧《狂欢命案》第2季。于万顺是农业水利工程师，结婚纪念日当天原本答应要带妻子女儿出游，却突然接到婚前女友的电话，要他赶到医院见她最后一面，待他到医院才知道前女友已病在膏肓命在旦夕，她当面托孤，要于万顺领养她的女儿。前女友说她已离婚，孩子的爹游手好闲不学好，早已不知去向。于万顺闻讯惊讶万分，他已有一个六岁的女儿涵秀…。但为了安病人的心，于万顺含泪答应，没想到当夜前女友就撒手西归。简单的办完前女友的后事，于万顺无从拒绝的带着两岁的女娃回到小城。妻子孙莉不相信小女娃的身分，认定小女娃必是于万顺留下的风流种，坚持将女娃送进福利院。夫妻为此事大吵了好几回…个性强硬的孙莉还没等到DNA鉴定出炉，就在一次争执中气冲冲的跳水投河，孙莉原只是要吓唬吓唬丈夫，没想到却弄假成真，被湍急的河水冲得无影无踪。女儿于涵秀知道父母亲吵架全是为了来路不明的小女娃所引起，对小女娃先就烙下恶劣的印象，直至母亲孙莉落水失踪，涵秀对父亲及取名涵韵的小妹从此愈发疏离与排斥。If a service needs to be public-oriented, it needs to provide a user access interface. These interfaces just give hackers the opportunity to take advantage of them. For example, the TCP/IP protocol handshake defect can be used to consume the link resources of the server, The stateless mechanism of UDP protocol can be used to forge a large number of UDP data packets to block communication channels... It can be said that the world of the Internet has not lacked attack points exploited by DDoS since its birth, from TCP/IP protocol mechanism to CC, DNS and NTP reflection attacks, and what's more, it uses various application vulnerabilities to launch more advanced and accurate attacks.