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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.军阀门树仁藏在密室的八百块金砖意外失踪，几经追查，却没有下落，最终成为一桩悬案。崔家寨的崔森林被强盗所杀，其妻也死于非命，绸缎庄老板杨三省收养其女桃子，并改名为桂花。桂儿长大后，爱上哥哥杨大川，不料军阀门树仁看中桂花，强行逼婚，杨家大难临头，为救杨大川，桂花被迫嫁入门家当了三姨太。多年后，杨大川从延安归来，为陕北抗日筹集物资，已是军统特派员的杨莲花也受命回到西安，黄金案再次成为争夺焦点。桂花得知身世真相，盗窃黄金和杀死父母的竟是养父杨三省，她痛心欲绝，智斗杨三省，为父母报仇雪恨。日本飞机轰炸西安，老百姓饱受苦难，桂花毅然投身抗日，将金砖交给杨大川，两人历尽波折，终于前往陕北。Figure 25 Change Trend of Ranking of Provinces Belonging to Local Forged Traffic Source Router in China in Recent Half a Year他记得，当时去教授家里做客，教授拿出了同样情绪的一幅字，给他讲了很久，并且说明这幅字是民国时期教授他爷爷用一栋楼换的，现在同样值一栋楼，这才是最保值的投资。板栗扬眉道：哦？周篁肯定地点头：嗯，没丢。看见他醒来，紫茄并未惊喜或者怎样，俏脸绷紧，依旧不停地忙碌：药箱打开在一旁，刀子剪子换个不停，带血的棉布扔了一块又一块。众人听到项羽先安排楚怀王，并且尊奉之倒是情理之中，理所应当的。