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centos7 iptables 设置

centos7 iptables 设置

作者: 李孝伟 | 来源:发表于2019-04-30 21:32 被阅读0次

    CentOS 7.0默认使用的是firewall作为防火墙

    关闭firewall:
    systemctl stop firewalld.service #停止firewall
    systemctl disable firewalld.service #禁止firewall开机启动
    firewall-cmd --state #查看默认防火墙状态(关闭后显示notrunning,开启后显示running)

    将centos设置iptables防火墙

    iptables防火墙(这里iptables已经安装,下面进行配置)
    vi /etc/sysconfig/iptables #编辑防火墙配置文件

    # sampleconfiguration for iptables service
    # you can edit thismanually or use system-config-firewall
    # please do not askus to add additional ports/services to this default configuration
    *filter
    :INPUT ACCEPT [0:0]
    :FORWARD ACCEPT[0:0]
    :OUTPUT ACCEPT[0:0]
    -A INPUT -m state--state RELATED,ESTABLISHED -j ACCEPT
    -A INPUT -p icmp -jACCEPT
    -A INPUT -i lo -jACCEPT
    -A INPUT -p tcp -mstate --state NEW -m tcp --dport 22 -j ACCEPT
    -A INPUT -p tcp -m state --state NEW -m tcp --dport 80 -jACCEPT
    -A INPUT -p tcp -m state --state NEW -m tcp --dport 8080-j ACCEPT
    -A INPUT -j REJECT--reject-with icmp-host-prohibited
    -A FORWARD -jREJECT --reject-with icmp-host-prohibited
    COMMIT
    

    :wq! #保存退出

    备注:这里使用80和8080端口为例。***部分一般添加到“-A INPUT -p tcp -m state --state NEW -m tcp--dport 22 -j ACCEPT”行的上面或者下面,切记不要添加到最后一行,否则防火墙重启后不生效。
    systemctl restart iptables.service #最后重启防火墙使配置生效
    systemctl enable iptables.service #设置防火墙开机启动

    以下例子是只允许ip 10.0.200.19 访问 5601端口

    # sample configuration for iptables service
    # you can edit this manually or use system-config-firewall
    # please do not ask us to add additional ports/services to this default configuration
    *filter
    :INPUT ACCEPT [0:0]
    :FORWARD ACCEPT [0:0]
    :OUTPUT ACCEPT [0:0]
    -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 -p tcp -s 10.0.200.19  --dport 5601  -j ACCEPT
    -A INPUT -p tcp --dport 5601 -j DROP
    COMMIT
    

    要注意顺序,自上而下,如果反了则全部会全部drop!!!

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