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It can perform one task per second, which is very practical in some environments with high real-time requirements.Centos7, The service is no longer started using init-style scripts, Instead, the unit file is used, Therefore, commands like service iptables start can no longer be used in centos7, Therefore, service iptables save cannot be executed. At the same time, firewall is used to replace the original iptables service in centos7, but don't worry, we just need to install iptables and iptables-services through yum source (iptables are usually installed by default, but iptables-services are not installed by default in centos7). After installing iptables-services in centos7, the rules can be saved by the service iptables save command, as in centos6, and the rules are also saved in the/etc/sysconfig/iptables file.忽然，他问林聪：林火长，若是让你去跟他们谈判。白浅在结婚那天发现她的未婚夫和她最好的闺蜜有一腿，甚至连父母的死亡都是这两人一手谋划。没想到万般崩溃之际，白浅又遇上了被下药的墨洛笙！一夜过后一切都不如从前；两人签订了三年包养合约，白浅一边借墨洛笙的资本实行复仇计划，一边两人的感情也逐渐产生了质变......When the server provides some UDP-based services, such as DNS, SMTP, NTP, etc., and finds some requests, in which the Response message is larger than the Request message, the Attacker sends a Request message that forges the source IP, and the source IP forges the IP address of the victim. After receiving the Request message, the server replies the "enlarged" Response message to the victim, thus realizing the amplification of traffic. The principle is roughly as follows: