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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.《爱是永恒》改编自法国作家艾莉丝费尼的小说，描述十九世纪末，正当双十年华的范伦婷爱上朱勒斯，两人决定共组美好家庭，却遇上世界大战爆发。家里搞这么繁缛的排场，可烦透了习惯清静的沈悯芮，虽然有一宴跟自己有关，可她实在不愿抛头露面，这几日只好一反常态，天一亮就跟着翘儿混到海舍那边，想着自己白吃白喝这么久也有些不好意思，便随手搞些刺绣女红，也算打发时间。书生眼神一闪，不动声色地低头喝了一口茶，然后才抬头打量玉米。? ? ? ?电影的结尾，令狐冲远走海外，恐怕也是一种自我放逐。