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Compared with SYN cache method, SYN? Cookies technology does not need to allocate space at all when receiving a SYN. Because the most basic data that make up the connection state are encoded and compressed into the sequence number bits of SYN-ACK. For a legitimate connection, the server will receive an ACK message segment with a serial number (actually the serial number has been added by 1), then the basic TCB data will be regenerated, and a complete TCB will confirm that the data will be safely instantiated through decompression. This decompression can be successful even under severe attacks, because there is no storage load at all on the host side, only the load that calculates the encoded data into the ACK sequence number. The disadvantage is that not all TCB data can be added to the 32-bit sequence number segment, so some TCP options required for high performance cannot be encoded. Another problem is that such SYN-ACK message segments will not be forwarded (because forwarding requires complete state data).The foundation of SYN flooding attack is the design of three-way handshake when TCP is used to establish connection. The third packet verifies that the connection initiator has the ability to accept the packet at the source IP address used in the first request, that is, its return is reachable. Figure 1 shows the process of exchanging packets at the beginning of a normal TCP connection.2006A particle physicist grieving over the loss of her husband in a car crash travels to a parallel world to find him again, with dire consequences for her family.2003年 ルパン三世お宝返却大作戦!! 宝物返还大作战Left Rudder Shift + Left Arrow Shift + Left Arrow-杂志社编辑庞石嘉和同事深入神秘的无人丛林拍摄素材，遭遇毒蛇追击误闯地下蛇宫。侥幸逃脱的三人偶遇受伤老者，得闻嗜血蛇王与人类约定保护一方水土的传说。一行人决定离开丛林时被捕蛇人劫持，只好为他们指路去往蛇宫。捕蛇人设下陷阱杀害蛇王，蛇王震怒大开杀戒，庞石嘉一行以德报怨救下唯一幸存的捕蛇人。亲眼目睹兄弟被巨蛇吞食的捕蛇人后悔不已，决定与庞石嘉一行尽快出山，却被林中游走的盗猎者看到他们装有蛇王蜕下的天价蛇皮。盗猎者伺机而动，准备持枪胁迫庞石嘉一行带他们找到蛇王，生死危机近在眼前，而另一方面，蛇王率百蛇对人发起攻击，蛇口之下又有几人能顺利逃生？