centos系统防火墙iptables禁止访问某个网站域名

1、iptables禁止访问某个域名   （未测试）

https://unbroken.blog.csdn.net/article/details/96512419?spm=1001.2101.3001.6650.1&utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7ECTRLIST%7ERate-1-96512419-blog-106993050.pc_relevant_3mothn_strategy_and_data_recovery&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7ECTRLIST%7ERate-1-96512419-blog-106993050.pc_relevant_3mothn_strategy_and_data_recovery&utm_relevant_index=2

https://blog.csdn.net/qq_35899407/article/details/90061141?spm=1001.2101.3001.6661.1&utm_medium=distribute.pc_relevant_t0.none-task-blog-2%7Edefault%7ECTRLIST%7ERate-1-90061141-blog-96512419.pc_relevant_multi_platform_whitelistv4&depth_1-utm_source=distribute.pc_relevant_t0.none-task-blog-2%7Edefault%7ECTRLIST%7ERate-1-90061141-blog-96512419.pc_relevant_multi_platform_whitelistv4&utm_relevant_index=1

1.禁止访问百度
# iptables -A OUTPUT -p tcp -d www.baidu.com --dport 80 -j DROP
# iptables -L //生效
 
2.允许访问百度
# iptables -A OUTPUT -p tcp -d www.baidu.com --dport 80 -j ACCEPT
# iptables -L
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