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《明日传奇》即将播出的第四季曝光预告片，从穿越去美国大西部，到遇见巨大的蓝色填充玩具，剧情脑洞大开，同时，DC漫画的魔鬼猎手康斯坦丁升为常规主演。第四季将在10月22日首播。在二次元世界里，大盗安世耿窃取朝廷铸币铜模穿越到三维人类空间，神侯府掌门诸葛正我被迫派出弟子吴亮追捕，但吴亮穿越后下落不明，诸葛逐派门下四大萌捕：无情，冷血，铁手，追命一同寻找吴亮。穿越后的他们遇上无情前世夫君转世凌硕，引发另一个改变时空的秘密—金算盘，来自二次元的四大萌捕在三维空间与叛变的吴亮和安世耿决一死战。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.　　社会我浅姐大展演技拿下签单，却失足跌入老狐狸的坑里。毕竟，你防得了敌人枪林弹雨，怎么防得住敌人和你卖萌耍帅？The simulation is shown in the following figure