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5. Check the calculation, select another front row of defense data, and continue to learn from each other to verify the correctness of the formula.Iptables-save >/etc/sysconfig/iptables1. Template method patternDefines a one-to-many dependency relationship between objects. When the state of an object changes, all objects that depend on it are notified and automatically updated.The attacker first completes the three-way handshake to establish the connection, but in the last ACK reply of the three-way handshake, the TCP window size is set to 0, and then a data request is made. When the attack target sends the request result to the attacker, it stops the data transmission when it finds that the TCP window size is 0, and sends out a TCP window detection packet to ask the attacker if the TCP window has been updated. Since the attacker will not update the window size, the attack target will always maintain the TCP connection and wait for the data to be sent, and continuously carry out TCP window size detection. When the number of controlled hosts in the botnet is large, Target's connection table will gradually be exhausted, resulting in denial of service.尹旭道：这就是了，明知治我罪，一方面要考虑天下和诸侯的反应与议论，另外还得考虑你们的存在。以一个穴居人和一只濒临灭绝的恐龙为特色。悲剧将这种看似不可能的友谊联系在一起，使其成为生存的唯一希望。