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In TCP protocol, messages arriving at the destination will enter the buffer of the TCP stack and will not be forwarded to the receiving system until the buffer is full. This is to minimize the number of times the system empties the buffer. However, the sender can force the receiving system to clear the contents of the buffer by sending a TCP message with a PSH flag of 1. The TCP PUSH + ACK attack, like the TCP SYN attack, aims to deplete the resources of the victim system. When an attacker sends TCP messages with PSH and ACK flags set to 1 to the Target host, these messages will cause the Target system to clear all TCP buffers (whether the buffers are full or not) and respond with an acknowledgement message. If this process is performed by a large number of controlled hosts, the system will not be able to process normal data, resulting in denial of service.Note: Firewall is used by default in centos7. If you want to save the rules with the above command, you need to install iptables-services. Please review the above for the specific configuration process.一部描写脑外神经科医生们的故事，崔贞媛饰演极富使命感又一板一眼的神经科医生尹智慧，对患者极为热忱温暖，积极坚强。将与申河均饰演的男主角有对手戏。Note a few points:This time, we stayed up all night and dug up three feet. We vowed to dig out more than 100 of his stars, including Oppo star family members, product spokesmen, advertising models and cooperative stars, so as to make a big market for Oppo cooperative stars and open our eyes to everyone.