CentOS7安装iptables防火墙的方法
<p>CentOS7默认的防火墙不是iptables,而是firewalle.</p>
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安装iptable iptable-service</p>
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<code class="bash comments">#先检查是否安装了iptables</code>
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<code class="bash plain">service iptables status</code>
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<code class="bash comments">#安装iptables</code>
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<code class="bash plain">yum </code><code class="bash functions">install</code> <code class="bash plain">-y iptables</code>
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<code class="bash comments">#升级iptables</code>
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<code class="bash plain">yum update iptables </code>
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<code class="bash comments">#安装iptables-services</code>
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<code class="bash plain">yum </code><code class="bash functions">install</code> <code class="bash plain">iptables-services</code>
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禁用/停止自带的firewalld服务</p>
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<code class="bash comments">#停止firewalld服务</code>
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<code class="bash plain">systemctl stop firewalld</code>
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<code class="bash comments">#禁用firewalld服务</code>
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<code class="bash plain">systemctl mask firewalld</code>
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设置现有规则</p>
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<code class="bash comments">#查看iptables现有规则</code>
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<code class="bash plain">iptables -L -n</code>
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<code class="bash comments">#先允许所有,不然有可能会杯具</code>
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<code class="bash plain">iptables -P INPUT ACCEPT</code>
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<code class="bash comments">#清空所有默认规则</code>
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<code class="bash plain">iptables -F</code>
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<code class="bash comments">#清空所有自定义规则</code>
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<code class="bash plain">iptables -X</code>
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<code class="bash comments">#所有计数器归0</code>
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<code class="bash plain">iptables -Z</code>
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<code class="bash comments">#允许来自于lo接口的数据包(本地访问)</code>
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<code class="bash plain">iptables -A INPUT -i lo -j ACCEPT</code>
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<code class="bash comments">#开放22端口</code>
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<code class="bash plain">iptables -A INPUT -p tcp --dport 22 -j ACCEPT</code>
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<code class="bash comments">#开放21端口(FTP)</code>
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<code class="bash plain">iptables -A INPUT -p tcp --dport 21 -j ACCEPT</code>
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<code class="bash comments">#开放80端口(HTTP)</code>
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<code class="bash plain">iptables -A INPUT -p tcp --dport 80 -j ACCEPT</code>
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<code class="bash comments">#开放443端口(HTTPS)</code>
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<code class="bash plain">iptables -A INPUT -p tcp --dport 443 -j ACCEPT</code>
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<code class="bash comments">#允许ping</code>
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<code class="bash plain">iptables -A INPUT -p icmp --icmp-</code><code class="bash functions">type</code> <code class="bash plain">8 -j ACCEPT</code>
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<code class="bash comments">#允许接受本机请求之后的返回数据 RELATED,是为FTP设置的</code>
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<code class="bash plain">iptables -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT</code>
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<code class="bash comments">#其他入站一律丢弃</code>
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<code class="bash plain">iptables -P INPUT DROP</code>
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<code class="bash comments">#所有出站一律绿灯</code>
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<code class="bash plain">iptables -P OUTPUT ACCEPT</code>
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<code class="bash comments">#所有转发一律丢弃</code>
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<code class="bash plain">iptables -P FORWARD DROP</code>
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其他规则设定</p>
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<code class="bash comments">#如果要添加内网ip信任（接受其所有TCP请求）</code>
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<code class="bash plain">iptables -A INPUT -p tcp -s 45.96.174.68 -j ACCEPT</code>
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<code class="bash comments">#过滤所有非以上规则的请求</code>
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<code class="bash plain">iptables -P INPUT DROP</code>
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<code class="bash comments">#要封停一个IP，使用下面这条命令：</code>
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<code class="bash plain">iptables -I INPUT -s ***.***.***.*** -j DROP</code>
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<code class="bash comments">#要解封一个IP，使用下面这条命令:</code>
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<code class="bash plain">iptables -D INPUT -s ***.***.***.*** -j DROP</code>
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保存规则设定</p>
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<code class="bash comments">#保存上述规则</code>
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<code class="bash plain">service iptables save</code>
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<p>
开启iptables服务</p>
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<code class="bash comments">#注册iptables服务</code>
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<code class="bash comments">#相当于以前的chkconfig iptables on</code>
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<code class="bash plain">systemctl </code><code class="bash functions">enable</code> <code class="bash plain">iptables.service</code>
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<code class="bash comments">#开启服务</code>
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<code class="bash plain">systemctl start iptables.service</code>
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<code class="bash comments">#查看状态</code>
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<code class="bash plain">systemctl status iptables.service</code>
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<p>
解决vsftpd在iptables开启后,无法使用被动模式的问题</p>
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1.首先在/etc/sysconfig/iptables-config中修改或者添加以下内容</p>
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<code class="bash comments">#添加以下内容,注意顺序不能调换</code>
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<code class="bash plain">IPTABLES_MODULES=</code><code class="bash string">"ip_conntrack_ftp"</code>
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<code class="bash plain">IPTABLES_MODULES=</code><code class="bash string">"ip_nat_ftp"</code>
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2.重新设置iptables设置</p>
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<code class="bash plain">iptables -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT</code>
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<p>
以下为完整设置脚本</p>
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<code class="bash preprocessor bold">#!/bin/sh</code>
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<code class="bash plain">iptables -P INPUT ACCEPT</code>
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<code class="bash plain">iptables -F</code>
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<code class="bash plain">iptables -X</code>
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<code class="bash plain">iptables -Z</code>
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<code class="bash plain">iptables -A INPUT -i lo -j ACCEPT</code>
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<code class="bash plain">iptables -A INPUT -p tcp --dport 22 -j ACCEPT</code>
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<code class="bash plain">iptables -A INPUT -p tcp --dport 21 -j ACCEPT</code>
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<code class="bash plain">iptables -A INPUT -p tcp --dport 80 -j ACCEPT</code>
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<code class="bash plain">iptables -A INPUT -p tcp --dport 443 -j ACCEPT</code>
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<code class="bash plain">iptables -A INPUT -p icmp --icmp-</code><code class="bash functions">type</code> <code class="bash plain">8 -j ACCEPT</code>
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<code class="bash plain">iptables -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT</code>
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<code class="bash plain">iptables -P INPUT DROP</code>
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<code class="bash plain">iptables -P OUTPUT ACCEPT</code>
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<code class="bash plain">iptables -P FORWARD DROP</code>
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<code class="bash plain">service iptables save</code>
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<code class="bash plain">systemctl restart iptables.service</code>
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<p>
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。</p>
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原文链接：http://www.cnblogs.com/kreo/p/4368811.html</p>
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