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公孙匡和梅子寒面沉如水。我们想以一百六十万的价格购买《重生传说》的电影版权。"WannaCry" and the attack on Wanwei Company both rely on cyber weapons stolen and released by shadow brokers, who effectively use these weapons against the government that develops weapons. WannaCry took advantage of the Windows operating system vulnerability "Eternal Blue" to launch an attack. It used unpatched Microsoft servers to spread malicious software (North Korea used it to spread blackmail software to 200,000 servers worldwide within 24 hours). The attack on Wanwei also used the "Eternal Blue" virus, but at the same time it also used another weapon called "DoublePulsar", which can penetrate the system without undermining the system's security measures. These weapons are designed to carry out silent destruction. They spread rapidly and uncontrollably, and anti-virus software all over the world cannot find them.3. A dialog box pops up.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.