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咱们乡下，本就没那么多穷规矩。SYN attack is a kind of DOS attack. It takes advantage of TCP protocol defects and consumes CPU and memory resources by sending a large number of semi-connection requests. SYN attacks can not only affect hosts, but also harm network systems such as routers and firewalls. In fact, SYN attacks can be implemented as long as these systems turn on TCP services no matter what systems are targeted. As can be seen from the above figure, the server receives the connection request (syn=j), adds this information to the unconnected queue, and sends the request packet to the client (syn=k, ack=j+1), then enters the SYN_RECV state. When the server does not receive an acknowledgement packet from the client, it retransmits the request packet and does not delete this entry from the non-connection queue until the timeout. With IP spoofing, SYN attacks can achieve good results, Typically, clients forge a large number of non-existent IP addresses in a short period of time, SYN packets are continuously sent to the server, and the server replies to the confirmation packets and waits for the confirmation of the customer. Since the source address does not exist, the server needs to continuously resend until it timeout. These forged SYN packets will occupy the unconnected queue for a long time, normal SYN requests will be discarded, the target system will run slowly, and in serious cases, the network will be blocked or even the system will be paralyzed.Ctrl + G: grid display mode control (F7)年初，陈立夫兄弟在浙江秘密成立特别训练班。爱国青年林天正、许松、沈文杰、顾一男等人被秘密招募。艰苦的训练让他们结下友谊，同时也给身为共产党员的教官高寒留下了深刻印象。在高寒带领下，林天正等人接受了入训以来的第一个任务。不料，他们被意外卷入一场阴谋之中。特训班的最高指挥官钱新之对林天正等人下达了追杀令。四一二事件爆发，林天正等人看清了国民党虚伪的嘴脸，主动协助高寒解救被国民党关押的共产党学员，最终揭穿了钱新之的丑恶面目。九一八事变后，日本的恶劣行径受到了以国际联盟为代表的国际社会的普遍反对，日本决定在上海制造事端以转移国际视线，林天正等人在高寒和另一名共产党员姚珂的帮助下，开始了抗日救国之路3. I will not complain about the recommendation of books on in-depth learning. There are too many slots to spit. Save some effort and recommend books that are really suitable for novice readers at different stages.一九三八年徐州会战后期，日军奇袭沽宁港，被潜伏多年的地下党员欧阳山川识破，无奈势单力薄无法阻止，沽宁城被占领。在身份特殊的城市无产者四道风的带领下，欧阳山川组建抗日组织“四道风”。这个极具个性化色彩和浪漫主义情怀的抗日组织包涵了社会各个阶层的各种力量。一九四一年太平洋战争爆发，沽宁经历了抗战期间敌后武装最艰难的两年；“四道风”接到命令：不惜一切代价把原子物理学家何莫修送上美军的接应船只。在漫长的突围之战中，游击队除去了沽宁城大汉奸李六野。性格温吞但内心血性十足的何莫修最终被感染而决定留下来，正式成为“四道风”一员。 一九四五年抗战末期，败势已定的日军在沽宁修建机场，将半个沽宁的百姓作为人力资源关进了工地，一向被人当作懦夫的何莫修在欧阳垂危之际却挺起了脊梁，指挥着工地内外的反抗运动。在游击队引领下，国军攻克了这处威胁重大的机场。中国人第一次没有党派阶级之分地聚集在沽宁城外。抗战全面胜利，欧阳将一生最灿烂的时候和他最珍贵的东西都留在了沽宁。抗日组织“四道风”永远只有一二十来人，但在整场战争中