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最近通过优惠券买了一个美国的VPS，虽然配置低了点，但是用来做平时网站的备份，或者临时当作离线下载服务器都是很不错的主意！因为国内周知的原因，访问一些国外的网站很受限制，所以想起了用自己的VPS来搭建一个VPN的想法。具体实现如下：
<ol>
<li>安装pptpd，这是个VPN服务器端软件<pre>sudo apt-get install pptpd</pre></li>
<li>修改文件 /etc/pptpd.conf<pre>sudo vi /etc/pptpd.conf</pre>
找到# TAG: localip一行，在后面添加以下2行：<br>localip 192.168.0.1<br>remoteip 192.168.0.234-238,192.168.0.245</li>
<li>修改文件 /etc/ppp/pptpd-options<pre>sudo vi /etc/ppp/pptpd-options</pre>
找到 #ms-dns这行，去掉前面的#号，修改成google提供的DNS server或其他DNS：<br>ms-dns 8.8.8.8<br>ms-dns 8.8.4.4</li>
<li>修改文件 /etc/ppp/chap-secrets，按一行四列添加账号、服务器名、密码和IP限制。服务器名（默认 写pptpd 即可，务必与 pptpd-options 文件的name一行一样）。如创建一个名为user，密码为userpasswd，不限制登录IP的VPN账号：<br>user pptpd userpasswd *</li>
<li>修改文件 /etc/sysctl.conf，去掉这一行 #net.ipv4.ip_forward=1 的#号，开启ipv4 forward，然后运行命令：<pre>sudo sysctl –p</pre>
运行后会显示 net.ipv4.ip_forward = 1，就表示修改生效了。</li>
<li>使用iptables建立一个NAT<pre>sudo apt-get install iptables
iptables -t nat -A POSTROUTING -s 192.168.0.0/24 -o eth0 -j MASQUERADE</pre>
上面的24表示子网掩码，代表24个1.<br>eth0是网卡名字，可以通过命令 ifconfig 查看</li>
</ol>
<p>为防止重启服务器后iptables丢失，先运行</p>
<pre>iptables-save > /etc/iptables.rule</pre>
<p>然后修改文件 /etc/network/interfaces ，在eth0/eth1.. 下面加入<br>pre-up iptables-restore < /etc/iptables.rule<br>7. 现在应该就搞定了,最后重启 pptpd</p>
<pre>sudo /etc/init.d/pptpd restart</pre>
<ol start="8">
<li>在client端设置连接VPN进行测试，client是Ubuntu的话请看这里<br>测试是否可以连接到VPN server：<pre>ping server_IP</pre>
不能的话，问题应该出在前4步。<br>测试是否可以连接到外网：（任何其他外网IP都行）<pre>ping 8.8.8.8</pre>
不能的话，问题应该出在第5-6步，看看是否正确设置了 ipv4 forward<br>测试是否可以解析DNS：<pre>nslookup google.com</pre>
</content></li>
</ol>
</article><div class="post-copyright"><div class="post-copyright__author"><span class="post-copyright-meta">文章作者: </span><span class="post-copyright-info"><a href="http://wangheng.org">王恒</a></span></div><div class="post-copyright__type"><span class="post-copyright-meta">文章链接: </span><span class="post-copyright-info"><a href="http://wangheng.org/setup-vpn-the-server.html">http://wangheng.org/setup-vpn-the-server.html</a></span></div><div class="post-copyright__notice"><span class="post-copyright-meta">版权声明: </span><span class="post-copyright-info">本博客所有文章除特别声明外，均采用 <a href="https://creativecommons.org/licenses/by-nc-sa/4.0/" target="_blank">CC BY-NC-SA 4.0</a> 许可协议。转载请注明来自 <a href="http://wangheng.org" target="_blank">王恒's Blog</a>！</span></div></div><div class="tag_share"><div class="post-meta__tag-list"><a class="post-meta__tags" href="/tags/VPS/">VPS</a><a class="post-meta__tags" href="/tags/%E4%BB%A3%E7%90%86/">代理</a><a class="post-meta__tags" href="/tags/Ubuntu/">Ubuntu</a><a 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