iptables firewall commonly used commands

iptables firewall to stop and start basic operations

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iptables firewall is commonly used before centos7, use a firewall on centos7

Firewall basic operations:

# 查询防火墙状态
    service iptables status
# 关闭防火墙
    service iptables stop
# 开启防火墙
    service iptables start
# 重启防火墙
    service iptables restart
# 永久关闭防火墙
    chkconfig iptables off
# 永久关闭后开启防火墙
    chkconfig iptables on 
# 查询当前iptables的规则
    iptables -L --line-numbers

Open port and close port

On opening and closing the port, we here in the form of editing configuration files, configuration file is / etc / sysconfig / iptables

Add a line in the configuration file

# 开放端口
    -A INPUT -p tcp --dport 22 -j ACCEPT
# 关闭端口
    -A INPUT -p tcp --dport 22 -j DROP