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Linux防火墙入门——iptables、firewalld配置详解

  • 2026-02-05 20:26:33
Linux防火墙入门——iptables、firewalld配置详解

合理的防火墙是你的计算机防止网络入侵的第一道屏障。你在家里上网,通常互联网服务提供会在路由中搭建一层防火墙。当你离开家时,那么你计算机上的那层防火墙就是仅有的一层,所以配置和控制好你 Linux 电脑上的防火墙很重要。

很多 Linux 发行版本已经自带了防火墙,通常是iptables,它很强大并可以自定义,但配置起来有点复杂,firewalld也是用于管理Linux机器上的防火墙规则的工具。

今天分享的这份资料称得上入门Linux防火墙的极佳教程。一共53页,从最基础的防火墙概念开始讲解,涵盖了iptablesSNAT、DNAT、firewalld以及rich规等知识点。

还有实战案例:马哥教育原校区的防火墙配置设置,还包括iptables超详细思维导图,干货满满!

目录

  • 防火墙的概念
  • iptables的基本认识
  • iptables的组成
  • iptables的基本语法
  • iptables之forward的概念
  • iptables之地址转换法则
  • SNAT源地址转换的具体实现
  • DNAT目标地址转换的具体实现
  • firewalld介绍
  • firewalld配置命令

防火墙概念全解

这部分介绍了什么是防火墙,防火墙分类又可以分为主机防火墙、网络层防火墙、硬件防火墙。

防火墙的基本认识

第二大部分内容介绍了三种常见防火墙工具:iptables, firewalld以及nftables

  • 2.1 Netfilter 

  • 2.2 防火墙工具介绍 

    • 2.2.1 iptables

    • 2.2.2 firewalld 

    • 2.2.3 nftables 

  • 2.3 netfilter 中五个勾子函数和报文流向 

  • 2.4 iptables的组成 

  • 2.5 netfilter 完整流程

iptables

第三大部分内容主要介绍了iptables:

  • 3 iptables
    • 3.1 iptables 规则说明 
      • 3.1.1 iptables 规则组成 
      • 3.1.2 iptables规则添加时考量点 
      • 3.1.3 本章学习环境准备
    • 3.2 iptables 用法说明 
    • 3.3 iptables 基本匹配条件 
    • 3.4 iptables 扩展匹配条件 
      • 3.4.1 隐式扩展 
      • 3.4.2 显式扩展及相关模块 
      • 3.4.2.1 multiport扩展 
      • 3.4.2.2 iprange扩展 
      • 3.4.2.3 mac扩展 
      • 3.4.2.4 string扩展 
      • 3.4.2.5 time扩展 
      • 3.4.2.6 connlimit扩展 
      • 3.4.2.7 limit扩展 
      • 3.4.2.8 state扩展 
    • 3.5 Target 
    • 3.6 规则优化最佳实践 
    • 3.7 iptables规则保存
    • 3.8 网络防火墙 
      • 3.8.1 FORWARD 链实现内外网络的流量控制 
      • 3.8.2 NAT 表 
      • 3.8.3 SNAT 
      • 3.8.4 DNAT
      • 3.8.5 REDIRECT 转发
    • 实战案例:马哥教育原校区的防火墙配置设置

还包括iptables超详细思维导图

思维导图

数据包处理路线图

表和通用匹配

状态(跟踪连接)机制和相关参数

连接协议

完整高清版思维导图下拉文末直达领取!

firewalld服务

firewalld是CentOS 7.0新推出的管理netfilter的工具,firewalld是配置和监控防火墙规则的系统守护进程。可以实现iptables,ip6tables,ebtables等功能。

其他规则

rich规则比基本的firewalld语法实现更强的功能,不仅实现允许/拒绝,还可以实现日志syslog和auditd,也可以实现端口转发,伪装和限制速率。

无论对小白还是有一定基础的人,这都是一本实用性很强,具有指导意义的资料,认真读完它,相信你一定会有所受益!

如何获取以上资源

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*声明:部分资料源自网络,PDF版仅做分享学习,侵删

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  1. CONNECT:[ UseTime:0.000510s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000833s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.100806s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.100785s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000725s ]
  6. SELECT * FROM `set` [ RunTime:0.100600s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000833s ]
  8. SELECT * FROM `article` WHERE `id` = 469478 LIMIT 1 [ RunTime:0.100712s ]
  9. UPDATE `article` SET `lasttime` = 1770501416 WHERE `id` = 469478 [ RunTime:1.452014s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.023240s ]
  11. SELECT * FROM `article` WHERE `id` < 469478 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.024906s ]
  12. SELECT * FROM `article` WHERE `id` > 469478 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.012539s ]
  13. SELECT * FROM `article` WHERE `id` < 469478 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.035113s ]
  14. SELECT * FROM `article` WHERE `id` < 469478 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.016598s ]
  15. SELECT * FROM `article` WHERE `id` < 469478 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.014291s ]
2.052499s