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今儿两个王爷都哭了。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.老话说，‘萝卜进了城。紫月剑父母出巨资帮紫月剑的小说刷销量。According to the formula, the greater the damage (excluding additional damage), the higher the return of outbreak, generally speaking, it is group attack or single large damage. The character with additional damage as the main damage mode is not suitable for adding outbreak effect.章邯分析道：董翳来信说楚将军尹旭，带着万余人马消失了，你以为他去了哪里？濮阳？章平大惊失色，眼中有些迷惘。张子易血口喷人，辱臣名节。