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The principle is that syn messages are first responded to syn_ack by DDOS protection system. With a specific sequence number (recorded as a cookie). The real client returns an ack and the Acknowledge number is cookie+1. The fake client will not respond. In this way, we can know that the clients corresponding to those IP are real and add the real client IP to the white list. The next access passes directly, while other forged syn messages are intercepted. The following is a schematic diagram of protection:?"I personally feel that there is still a little luck in this, After breaking up the colony, For a few more minutes, I don't know, Because this is the first time I have met such an 'opponent', No one has experience, Anyway, one is counted as one, It is true that there is no end to shooting with guns. Fortunately, there were flamethrowers prepared to counter the impact on the position at that time. The model I remember was 74, At that time, it was still a relatively new model. In terms of performance, The direct firing distance of '74-jet' (abbreviation of 74-type flame thrower) is about 50-75 meters. If the soldiers who operate it are not specially trained, Generally, only straight-line targets can be hit, It's a little bit of a slope, But in the hands of specially trained veterans, '74 Jet' can fire into that air, Although the range is much less than that of direct shooting, Only 25-30 meters, But after all, he didn't take it to the plane, It is used to deal with enemies in low-rise buildings in street battles. Therefore, it is enough, but it is quite dangerous to spray high-altitude targets with flamethrowers. After all, the fuel sprayed out is liquid. Once the distance and wind direction are not grasped well, it is easy to let the fuel sprayed out fall back again. If it accidentally splashes on oneself, it is really a "fire".In fact, not necessarily. The poor who have been caught in a vicious circle for a long time will soon become poor even if they become rich occasionally. The National Bureau of Economic Research of the United States has conducted a survey: in the past 20 years, the bankruptcy rate of European and American lottery winners has reached 75% within 5 years.1949年冬天，蒋介石和毛人凤妄图在大西南苟延残喘，与新生的人民共和国相对抗，在重庆完成了震惊中外的渣滓洞、白公馆大屠杀后，秘密来到成都，向麇集在这里上万的军统特务和各路特务，布置了“密裁、破坏、潜伏、游击”四大任务。于是，当我刚刚组建的年轻的人民公安，随解放大军进入成都这座全国最后解放的一座大城市的时候，便面临着极其严峻、尖锐、激烈、复杂的铲除残匪，肃清敌特，保卫人民生命财产，保卫新生红色政权的……说，到底发生了什么？范依兰虽然悲伤，但聪慧明理的她知道事情不会这么简单，否则范紫完全可以光明正大地报丧，而不是采取这样隐秘的方式来见自己。The cabinet with the key is empty. Open the cabinet door and put in the articles. Then put in enough coins. Turn the key lock and pull out the key. The cabinet is locked. The usage method is basically the same as that of the lockers in domestic supermarkets.