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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.或者要个说法，首先一个条件就是保住性命。练霓裳怎么能这样？这还是女主角吗？这前所未有的刺激，让郑武心神几乎不能自主，呆呆地站着，脑中想象的都是练霓裳脸上挂着笑，眼神却狠辣无情，挥剑杀人。REJECT: Reject the data packet from passing through, and when necessary, send a response message to the data sender. The client will receive the rejected message as soon as it requests.陈启，你一定要教我国术。1. Download a Google Earth software and enter Google Earth.