iptables基本原理讲解与规则的增删改查

待整理

https://www.cnblogs.com/Linux-mds/p/12396113.html

https://www.cnblogs.com/f-ck-need-u/p/7397146.html

禁止某个端口对外的访问

iptables -A input -p tcp --dport 8000 -j drop