一、PPTPD安装完后服务无法开启但是端口状态是监听状态如下：

root@li738-82:~# netstat -nptl查询端口状态时1723是被PPTPD使用中的
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      2390/sshd       
tcp        0      0 0.0.0.0:1723            0.0.0.0:*               LISTEN      6151/pptpd      
tcp6       0      0 :::22                   :::*                    LISTEN      2390/sshd     

root@li738-82:~# service pptpd status查询服务状态时提示

  * /usr/sbin/pptpd is not running 

二、卸载已安装的PPTPD,应为我是管理员账号所以就不用sudo了

apt-get  remove pptpd

三、更新源

1、为了以防万一先备份系统自带的源

cp /etc/apt/sources.list etc-backup/etc-apt-source.list

2、编辑vim /etc/apt/sources.list添加下列某个源地址然后apt-get update

#台湾源

1. deb http://tw.archive.ubuntu.com/ubuntu/ precise main universe restricted multiverse
   

2. deb-src http://tw.archive.ubuntu.com/ubuntu/ precise main universe restricted multiverse
   

3. deb http://tw.archive.ubuntu.com/ubuntu/ precise-security universe main multiverse restricted
   

4. deb-src http://tw.archive.ubuntu.com/ubuntu/ precise-security universe main multiverse restricted
   

5. deb http://tw.archive.ubuntu.com/ubuntu/ precise-updates universe main multiverse restricted
   

6. deb-src http://tw.archive.ubuntu.com/ubuntu/ precise-updates universe main multiverse restricted

#网易 Ubuntu 源（速度很快）

1. deb http://mirrors.163.com/ubuntu/ precise main universe restricted multiverse
   

2. deb-src http://mirrors.163.com/ubuntu/ precise main universe restricted multiverse
   

3. deb http://mirrors.163.com/ubuntu/ precise-security universe main multiverse restricted
   

4. deb-src http://mirrors.163.com/ubuntu/ precise-security universe main multiverse restricted
   

5. deb http://mirrors.163.com/ubuntu/ precise-updates universe main multiverse restricted
   

6. deb http://mirrors.163.com/ubuntu/ precise-proposed universe main multiverse restricted
   

7. deb-src http://mirrors.163.com/ubuntu/ precise-proposed universe main multiverse restricted
   

8. deb http://mirrors.163.com/ubuntu/ precise-backports universe main multiverse restricted
   

9. deb-src http://mirrors.163.com/ubuntu/ precise-backports universe main multiverse restricted
   

10. deb-src http://mirrors.163.com/ubuntu/ precise-updates universe main multiverse restricted

#骨头源，骨头源是bones7456架设的一个Ubuntu源 ，提供ubuntu,deepin

1. deb http://ubuntu.srt.cn/ubuntu/ precise main universe restricted multiverse
   

2. deb-src http://ubuntu.srt.cn/ubuntu/ precise main universe restricted multiverse
   

3. deb http://ubuntu.srt.cn/ubuntu/ precise-security universe main multiverse restricted
   

4. deb-src http://ubuntu.srt.cn/ubuntu/ precise-security universe main multiverse restricted
   

5. deb http://ubuntu.srt.cn/ubuntu/ precise-updates universe main multiverse restricted
   

6. deb http://ubuntu.srt.cn/ubuntu/ precise-proposed universe main multiverse restricted
   

7. deb-src http://ubuntu.srt.cn/ubuntu/ precise-proposed universe main multiverse restricted
   

8. deb http://ubuntu.srt.cn/ubuntu/ precise-backports universe main multiverse restricted
   

9. deb-src http://ubuntu.srt.cn/ubuntu/ precise-backports universe main multiverse restricted
   

10. deb-src http://ubuntu.srt.cn/ubuntu/ precise-updates universe main multiverse restricted

#mirror.lupaworld.com的源，速度很快

1. deb http://mirror.lupaworld.com/ubuntu/archive/ precise main restricted universe multiverse
   

2. deb http://mirror.lupaworld.com/ubuntu/archive/ precise-security main restricted universe multiverse
   

3. deb http://mirror.lupaworld.com/ubuntu/archive/ precise-updates main restricted universe multiverse
   

4. deb http://mirror.lupaworld.com/ubuntu/archive/ precise-backports main restricted universe multiverse
   

5. deb http://mirror.lupaworld.com/ubuntu/ubuntu-cn/ precise main restricted universe multiverse

#ubuntu.cn99.com源（推荐）:

1. deb http://ubuntu.cn99.com/ubuntu/ precise main restricted universe multiverse
   

2. deb http://ubuntu.cn99.com/ubuntu/ precise-updates main restricted universe multiverse
   

3. deb http://ubuntu.cn99.com/ubuntu/ precise-security main restricted universe multiverse
   

4. deb http://ubuntu.cn99.com/ubuntu/ precise-backports main restricted universe multiverse
   

5. deb http://ubuntu.cn99.com/ubuntu-cn/ precise main restricted universe multiverse

#电子科技大学

1. deb http://ubuntu.uestc.edu.cn/ubuntu/ precise main restricted universe multiverse
   

2. deb http://ubuntu.uestc.edu.cn/ubuntu/ precise-backports main restricted universe multiverse
   

3. deb http://ubuntu.uestc.edu.cn/ubuntu/ precise-proposed main restricted universe multiverse
   

4. deb http://ubuntu.uestc.edu.cn/ubuntu/ precise-security main restricted universe multiverse
   

5. deb http://ubuntu.uestc.edu.cn/ubuntu/ precise-updates main restricted universe multiverse
   

6. deb-src http://ubuntu.uestc.edu.cn/ubuntu/ precise main restricted universe multiverse
   

7. deb-src http://ubuntu.uestc.edu.cn/ubuntu/ precise-backports main restricted universe multiverse
   

8. deb-src http://ubuntu.uestc.edu.cn/ubuntu/ precise-proposed main restricted universe multiverse
   

9. deb-src http://ubuntu.uestc.edu.cn/ubuntu/ precise-security main restricted universe multiverse
   

10. deb-src http://ubuntu.uestc.edu.cn/ubuntu/ precise-updates main restricted universe multiverse

#中国科技大学

1. deb http://debian.ustc.edu.cn/ubuntu/ precise main restricted universe multiverse
   

2. deb http://debian.ustc.edu.cn/ubuntu/ precise-backports restricted universe multiverse
   

3. deb http://debian.ustc.edu.cn/ubuntu/ precise-proposed main restricted universe multiverse
   

4. deb http://debian.ustc.edu.cn/ubuntu/ precise-security main restricted universe multiverse
   

5. deb http://debian.ustc.edu.cn/ubuntu/ precise-updates main restricted universe multiverse
   

6. deb-src http://debian.ustc.edu.cn/ubuntu/ precise main restricted universe multiverse
   

7. deb-src http://debian.ustc.edu.cn/ubuntu/ precise-backports main restricted universe multiverse
   

8. deb-src http://debian.ustc.edu.cn/ubuntu/ precise-proposed main restricted universe multiverse
   

9. deb-src http://debian.ustc.edu.cn/ubuntu/ precise-security main restricted universe multiverse
   

10. deb-src http://debian.ustc.edu.cn/ubuntu/ precise-updates main restricted universe multiverse

#北京理工大学

1. deb http://mirror.bjtu.edu.cn/ubuntu/ precise main multiverse restricted universe
   

2. deb http://mirror.bjtu.edu.cn/ubuntu/ precise-backports main multiverse restricted universe
   

3. deb http://mirror.bjtu.edu.cn/ubuntu/ precise-proposed main multiverse restricted universe
   

4. deb http://mirror.bjtu.edu.cn/ubuntu/ precise-security main multiverse restricted universe
   

5. deb http://mirror.bjtu.edu.cn/ubuntu/ precise-updates main multiverse restricted universe
   

6. deb-src http://mirror.bjtu.edu.cn/ubuntu/ precise main multiverse restricted universe
   

7. deb-src http://mirror.bjtu.edu.cn/ubuntu/ precise-backports main multiverse restricted universe
   

8. deb-src http://mirror.bjtu.edu.cn/ubuntu/ precise-proposed main multiverse restricted universe
   

9. deb-src http://mirror.bjtu.edu.cn/ubuntu/ precise-security main multiverse restricted universe
   

10. deb-src http://mirror.bjtu.edu.cn/ubuntu/ precise-updates main multiverse restricted universe

#兰州大学

1. deb ftp://mirror.lzu.edu.cn/ubuntu/ precise main multiverse restricted universe
   

2. deb ftp://mirror.lzu.edu.cn/ubuntu/ precise-backports main multiverse restricted universe
   

3. deb ftp://mirror.lzu.edu.cn/ubuntu/ precise-proposed main multiverse restricted universe
   

4. deb ftp://mirror.lzu.edu.cn/ubuntu/ precise-security main multiverse restricted universe
   

5. deb ftp://mirror.lzu.edu.cn/ubuntu/ precise-updates main multiverse restricted universe
   

6. deb ftp://mirror.lzu.edu.cn/ubuntu-cn/ precise main multiverse restricted universe

#上海交通大学

1. deb http://ftp.sjtu.edu.cn/ubuntu/ precise main multiverse restricted universe
   

2. deb http://ftp.sjtu.edu.cn/ubuntu/ precise-backports main multiverse restricted universe
   

3. deb http://ftp.sjtu.edu.cn/ubuntu/ precise-proposed main multiverse restricted universe
   

4. deb http://ftp.sjtu.edu.cn/ubuntu/ precise-security main multiverse restricted universe
   

5. deb http://ftp.sjtu.edu.cn/ubuntu/ precise-updates main multiverse restricted universe
   

6. deb http://ftp.sjtu.edu.cn/ubuntu-cn/ precise main multiverse restricted universe
   

7. deb-src http://ftp.sjtu.edu.cn/ubuntu/ precise main multiverse restricted universe
   

8. deb-src http://ftp.sjtu.edu.cn/ubuntu/ precise-backports main multiverse restricted universe
   

9. deb-src http://ftp.sjtu.edu.cn/ubuntu/ precise-proposed main multiverse restricted universe
   

10. deb-src http://ftp.sjtu.edu.cn/ubuntu/ precise-security main multiverse restricted universe
    

11. deb-src http://ftp.sjtu.edu.cn/ubuntu/ precise-updates main multiverse restricted universe 

四、下载安装pptpd 

1、apt-get install  pptpd 然后编辑 vim  /etc/pptpd.conf

去掉文件最末端的 localip 和 remoteip 两个参数的注释，并进行相应修改。这里，localip 是 VPN 连通后服务器的 ip 地址，而 remoteip 则是客户端的可分配 ip 地址,地址可以自由配置我选择的是默认地址。

2、编辑vim /etc/ppp/pptpd-options修改DNS服务器地址，找到ms-dns选项我修改为谷歌DNS服务器地址

ms-dns 8.8.8.8

ms-dns 8.8.4.4

3、编辑vim  /etc/ppp/chap-secrets  内容如下：

# Secrets for authentication using CHAP

# client             server                      secret                  IP addresses

用户名     服务类型（*代表自由识别）              密码                    IP地址可用*代替不做限制

4、全部搞定后，我们需要重启 pptpd 服务使新配置生效：

/etc/init.d/pptpd restart

找一台 Windows 电脑，新建个 VPN 链接，地址填服务器的 IP（或域名），用户名密码填刚才设置好的，域那项空着（如果你在 pptpd-options 中设置了，这里就保持一致），点连接就可以了。正常情况下您应该能够建立与服务器的 VPN 链接了。

建立连接之后，您会发现除了可以访问服务器的资源，其余内外和互联网的内容均无法访问。如果需要访问这些内容的话，我们还需要进一步设置：

首先，开启 ipv4 forward。方法是，修改 /etc/sysctl.conf，找到类似下面的行并取消它们的注释：

net.ipv4.ip_forward=1

然后使新配置生效：

sysctl -p

有些时候，经过这样设置，客户端机器就可以上网了（我在虚拟机上这样操作后就可以了）。但我在实验室的服务器上这样操作后仍然无法访问网络，这样我们就需要建立一个 NAT。这里我们使用强大的 iptables 来建立 NAT。首先，先安装 iptables：

apt-get intall iptables

装好后，我们向 nat 表中加入一条规则：

iptables -t nat -A POSTROUTING -s 192.168.0.1/24 -o eth0 -j MASQUERADE

这样操作后，客户端机器应该就可以上网了。

但是，只是这样，iptables 的规则会在下次重启时被清除，所以我们还需要把它保存下来，方法是使用 iptables-save 命令：

sudo iptables-save > /etc/iptables-rules

然后修改 /etc/network/interfaces 文件，找到 eth0 那一节，在对 eth0 的设置最末尾加上下面这句：

pre-up iptables-restore < /etc/iptables-rules

这样当网卡 eth0 被加载的时候就会自动载入我们预先用 iptables-save 保存下的配置。

本文出自 “睡到打饱嗝” 博客，请务必保留此出处http://huajian0816.blog.51cto.com/8834145/1588936

PPTPD安装笔记