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保证Linux系统安全之配置firewalld防火墙的地址伪装及端口转发实例，可跟做！！！-Aut...
source link: https://blog.51cto.com/14157628/2433980
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案例环境：需求描述：连接内网网卡ens33地址为192.168.1.1，分配到firewall的trusted区域；连接服务器网卡ens37地址为192.168.2.1，分配到firewall的dmz区域；网关服务器连接互联网网卡ens38地址为192.168.3.1，为公网IP地址，分配到firewall的external区域；网站服务器和网关服务器均通过SSH来远程管理，为了安全，将SSH默认
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