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iptables防火墙（一）-我要学学学的博客-51CTO博客
source link: http://blog.51cto.com/13502820/2068708
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1、防火墙：内核中具有包过滤体系内核态：netfilter用户态：iptables管理工具工作在网络层：可以对ip地址、端口、协议等信息进行处理2、规则链：规则的集合五种链：（必须大写）INPUT：入站OUTPUT：出站FORWARD：转发POSTROUTING：路由后转换PREROUTING：路由前转换3、规则表：规则链的集合有4个表：Raw：状态跟踪Mangle：设置标记Nat：地址转换Fil
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