摘要:
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这是一个简短的教程，目的是为了快速搭建一个可用的VPN，本文并不涉及有关VPN的正常使用内容。本简短教程基于以下硬件条件：一台安装了Debian GNU/Linux 5.0的VPS。当然理论上所有可以安装pptpd包的Linux/Unix系统都可以作为主机，教...
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这是一个简短的教程，目的是为了快速搭建一个可用的VPN，本文并不涉及有关VPN的正常使用内容。本简短教程基于以下硬件条件：一台安装了Debian GNU/Linux 5.0的VPS。当然理论上所有可以安装pptpd包的Linux/Unix系统都可以作为主机，教程中安装方式是基于Debian的apt-get命令，其他发行版请自行对照使用。
注意：只有Xen的VPS可以搭建pptp，OpenVZ的不行。因为openvz下只有venet0，没有eth0，而绝大多数的vps都是openvz的，然后绝大多数的openvz vps都没有masqurade，只能搭建openvpn并且要自签证书什么的，根本不能用pptpd。这里有个如何在openvz下搭建OpenVpn的教程：OpenVZ VPS安装配置OpenVPN
正文
- 推荐windows用户使用PuTTY连接服务器。
- 在Host Name处填写vps的ip地址，连接
- 用root跟你得到的root密码登录。
- 安装PPTPD
apt-get install pptpd
- 安装nano（如果你能够熟练的使用vi，可以省略这一步）
apt-get install nano
- 编辑pptpd.conf文件
nano /etc/pptpd.conf
使得非注释内容如下：
option /etc/ppp/pptpd-options localip 192.168.0.1 remoteip 192.168.0.234-238,192.168.0.245
- 添加登录用户
nano /etc/ppp/chap-secrets
添加一行，内容如下
你想要的用户名 pptpd "你想要的密码" *
密码用半角双引号括起来
上面内容很好理解，最后那个星号是说允许从任何IP地址联接，如果你想单独设定IP地址也可以。
理论上到这里一个vpn就已经搭建完毕了。无论你用的是Windows还是OSX，或者是iPhone OS，都可以通过建立一个pptp链接来联入这个VPN。不过你并不能通过这个来上Internet，因为所有的数据都作用于那台pptpd的服务器上， 而不会传入拨入的计算机设备上。要上Internet还需要这么干：
- 设置DNS解析，编辑pptpd-options
nano /etc/ppp/pptpd-options
找到ms-dns，取消掉注释，并修改DNS地址（推荐OpenDNS或者Google DNS）
- 开启转发
nano /etc/sysctl.conf
取消如下内容行的注释
net.ipv4.ip_forward=1
- 运行下面这条命令
echo 1 > /proc/sys/net/ipv4/ip_forward
- 安装iptables并设置
apt-get install iptables iptables -t nat -I POSTROUTING -j MASQUERADE
- 启动服务
/etc/init.d/pptpd restart
- VPN搭建完毕，可以尝试用客户端登录了。
这两句设置了当外部计算机通过pptp联接到vpn后所能拿到的ip地址范围和服务器的ip地址设置。
本文部分内容来自：http://www.kdolphin.com/node/1099和http://tuoniao.org/setup-vpn-on-vps-howto/
备注：http://yupeng.biz/b
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