# 基于netfilter的防火墙系统
本防火墙基于netfilter实现,测试运行环境为Ubuntu12.04系统版本,内核版本:3.13.0-32-generic。实现了规则匹配,状态连接列表,动态nat转换,日志查询等功能。提供了应用程序界面以及命令行两种版本的用户程序。</br>
## 使用方式
在这里首先介绍如何部署及使用本防火墙中的代码。<br>
要完成本实验共需要三台虚拟机(系统版本Ubuntu12.04,内核版本:3.13.0-32-generic),分别为内网主机,防火墙,外网主机。
### VMWARE添加虚拟网卡
运行VMWARE,编辑->虚拟网络编辑器->更改设置。添加虚拟网卡VMnet2(192.168.164.0/24)和VMnet3(192.168.152.0/24)。添加后的配置如下:<br><br>
<img src="images/vmnet.png" height="500" width="500" /><br><br>
“右键虚拟机->设置->添加->网络适配器“可以为虚拟机添加网卡。内网主机添加虚拟网卡VMnet2,外网主机添加虚拟网卡VMnet3,防火墙添加VMnet2和VMnet3两个网卡。添加完成后三台虚拟机的网络拓扑图如下:<br>
<img src="images/net_diagram.png"/><br><br>
### 内网主机配置
进入内网主机对应的虚拟机系统,点击右上角设置标志,"system setting->Network->options->IPv4 Settings"设置静态ip地址为:`192.168.164.2`,并将其网关设置为`192.168.164.1`。设置如下:<br><br>
<img src="images/ipsetting.png" height="400" width="350"/><br><br>
安装apache,开启web服务。并可以通过修改`/var/www/index.html`来修改网页的内容。安装完成后打开浏览器,访问127.0.0.1,如果能正常访问,说明web服务已经开启。命令如下:
```
sudo apt-get install apache2
sudo /etc/init.d/apache2 start
```
### 外网主机配置
类似内网主机虚拟机的设置,设置静态ip:`192.168.152.2`,并将网关设置为`192.168.152.1`。安装并开启web服务。
### 防火墙主机配置
首先开启防火墙转发功能,使用命令`sudo echo 1 > /proc/sys/net/ipv4/ip_forward`开启该功能。开启后测试内网主机(192.168.164.2)是否可以ping通外网主机(192.168.152.2)如果可以,说明目前为止配置没有问题。
#### 内核模块安装
将myfw文件夹拷贝到防火墙虚拟机中,执行以下命令:
```
cd myfw
make clean
make
sudo insmod myfw.ko
```
#### 运行用户程序
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