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If an attacker sends SYN packets quickly with their own undisguised IP address, this is a so-called direct attack. This attack is very easy to implement because it does not involve spoofing or modifying packets below the user layer of the attacker's operating system. For example, he can simply send many TCP connection requests to implement this attack. However, for this attack to work, the attacker must also prevent his system from responding to SYN-ACK packets because of any ACK, RST, or ICMP (Internet? Control? Message? Protocol) will cause the server to skip the SYN-RECEIVED state (go to the next state) and remove the TCB (because the connection has been successfully established or recycled). Attackers can do this by setting firewall rules, causing the firewall to block all packets (except SYN) to reach the server, or causing the firewall to block all incoming packets so that SYN-ACK packets are discarded before reaching the local TCP handler.《第三次初恋》讲述了处于第三次人生的男主角在今生遇见自己前世初恋的故事。In WORD2010, the text box adopts the shape style of "Fine Effect-Olive Color, Emphasize Color 3", which can be set in the text box style.都已经以社会人的身份生活，成为了正经的大人。习惯公司生活的爷爷为了孙女做了PTA的副会长，困难不断，笑与泪并存的PTA奋斗记