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When an attacker sends an http post request, he sets the Content-Length to a large value in the request header and sends the http body to the web server at a very slow speed, byte by byte. The web server always needs to maintain the connection with the client and wait for the data transmission to end. Because the content-length is set to a large value and the http body transmission speed is very slow, attackers can occupy this connection for a long time.According to statistics, SYN attack is the most common and easily used attack method among all hacker attacks. I believe many people still remember the attack on YAHOO website in 2000. At that time, hackers used simple and effective SYN attacks. Some network worms cooperated with SYN attacks to cause greater damage. This paper introduces the basic principle, tools and detection methods of SYN attack, and comprehensively discusses the prevention technology of SYN attack.该剧围绕四个家庭，讲述了家庭成员迎着阳光风雨努力奋斗，最终收获成长的故事。出身于小家碧玉的段亚蒙，天真活泼，同时受两大豪门公子顾家兴和殷如豹的追求。随着天津沦陷，日军残害了她的父母，突如其来的家仇国恨，她被迫嫁给殷如豹，与男友顾家兴分手，并认识了共产党员罗成方，至此四人的命运开始逆转。顾家兴因日伪的反间计，被迫踏上投敌的不归路，与段亚蒙成为头号对手，一直对她不离不弃的殷如豹为了支持她的事业为她献出了生命。亚蒙在罗成方的引领下逐步接触中共地下组织，两人在风刀霜剑中产生了情感和依恋。段亚蒙历经挚爱的背叛、亲朋的伤害，以及与强敌博弈的种种考验，千锤百炼，浴火重生，最终成为一个成熟的红色战士。1998年的过去，陈韵如从昏迷中醒来，在她昏迷的这几天，她做了一个好长好长的梦，梦里的她，名字叫做黄雨萱…秦旷立即兴致勃勃地问道：香儿妹妹这么说，定是有好法子应对，快说给我听听。