CentOS 防火墙配置 80端口
看了好几个页面内容都有错，下面是正确方法：
#/sbin/iptables -I INPUT -p tcp --dport 80 -j ACCEPT
#/sbin/iptables -I INPUT -p tcp --dport 22 -j ACCEPT
然后保存：
#/etc/rc.d/init.d/iptables save
再查看是否已经有了：
[root@vcentos ~]# /etc/init.d/iptables status
Table: filter
Chain INPUT (policy ACCEPT)
num? target???? prot opt source?????????????? destination????????
1??? ACCEPT???? udp? --? 0.0.0.0/0??????????? 0.0.0.0/0?????????? udp dpt:80
2??? ACCEPT???? tcp? --? 0.0.0.0/0??????????? 0.0.0.0/0?????????? tcp dpt:80
3??? RH-Firewall-1-INPUT? all? --? 0.0.0.0/0??????????? 0.0.0.0/0??????????
Chain FORWARD (policy ACCEPT)
num? target???? prot opt source?????????????? destination????????
1??? RH-Firewall-1-INPUT? all? --? 0.0.0.0/0??????????? 0.0.0.0/0
