linux防火墙打开端口

1、修改配置文件

[test@mprest1 classes]$ sudo vi /etc/sysconfig/iptables

-A INPUT -p tcp -m tcp --dport 80 -j ACCEPT
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
# Generated by iptables-save v1.4.7 on Thu Apr 13 02:40:12 2017
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [7:960]
-A INPUT -p udp -m udp --dport 80 -j ACCEPT
-A INPUT -p tcp -m tcp --dport 80 -j ACCEPT
-A INPUT -p tcp -m tcp --dport 8080 -j ACCEPT
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
COMMIT
# Completed on Thu Apr 13 02:40:12 2017

2、重启服务
[test@mprest1 classes]$ sudo service iptables stop

[test@mprest1 classes]$ sudo service iptables start