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	<title>pptpd &#8211; 記下來</title>
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	<description>一路上踩到的坑、遇到的問題，一點一滴記下來，希望能幫助到需要的人~</description>
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	<title>pptpd &#8211; 記下來</title>
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	<item>
		<title>CentOS &#8211; Couldn&#039;t open the /dev/ppp device: Permission denied</title>
		<link>https://noter.tw/3309/centos-couldnt-open-the-devppp-device-permission-denied/</link>
					<comments>https://noter.tw/3309/centos-couldnt-open-the-devppp-device-permission-denied/#respond</comments>
		
		<dc:creator><![CDATA[黃小蛙]]></dc:creator>
		<pubDate>Thu, 04 Dec 2014 10:51:55 +0000</pubDate>
				<category><![CDATA[Linux]]></category>
		<category><![CDATA[VPS]]></category>
		<category><![CDATA[ChicagoVPS]]></category>
		<category><![CDATA[VPN]]></category>
		<category><![CDATA[BuyVM]]></category>
		<category><![CDATA[pptpd]]></category>
		<category><![CDATA[CentOS]]></category>
		<category><![CDATA[permission denied]]></category>
		<guid isPermaLink="false">http://wazai.net/?p=3309</guid>

					<description><![CDATA[<p>在不熟悉的 CentOS 6 上裝 pptpd，弄了好一陣子還是不得其門而入，原本以為是設定的問題，好不容易設定完成，debug message 卻出現「Couldn&#8217;t open the&#46;&#46;&#46;</p>
<p>這篇文章 <a rel="nofollow" href="https://noter.tw/3309/centos-couldnt-open-the-devppp-device-permission-denied/" data-wpel-link="internal">CentOS &#8211; Couldn&#039;t open the /dev/ppp device: Permission denied</a> 最早出現於 <a rel="nofollow" href="https://noter.tw" data-wpel-link="internal">記下來</a>。</p>
]]></description>
										<content:encoded><![CDATA[<p>在不熟悉的 CentOS 6 上裝 pptpd，弄了好一陣子還是不得其門而入，原本以為是設定的問題，好不容易設定完成，debug message 卻出現「<span style="color: #ff0000;"><strong>Couldn&#8217;t open the /dev/ppp device: Permission denied</strong></span>」錯誤。<br />
<span id="more-3309"></span><br />
<span style="line-height: 1.5em;">這次 ChicagoVPS 推出了 Black Friday 與 Cyber Monday 優惠方案，看了一下真的非常誘人，二話不說馬上買了一台來玩，算一算只比之前的 BuyVM 基本款一年方案貴一點點，整體規格卻大幅提升，來看看方案比較：</span><br />
ChicagoVPS 小蛙挑選的方案 2 GB RAM、30 GB SSD RAID 10、流量 2 TB、一次買三年 49 美元，約每年 16.34 美元，<br />
BuyVM 小蛙原本的方案是 128 MB RAM、15 GB Space、流量 500GB、每年 15 美元。<br />
怎麼看都是這次的優惠方案划算些。<br />
在 CentOS 上安裝完 pptpd 之後，怎麼連就是無法使用，都會出現「<span style="color: #ff0000;"><strong>Couldn&#8217;t open the /dev/ppp device: Permission denied</strong></span>」，Google 了一下，各式各樣的解法都有，有的說把 /dev/ppp 更改權限，有的說砍掉 blablabla &#8230;，但感覺還是怪怪的，VPS 後台的&nbsp;TUN / TAP 也已經 Enabled 了，怎麼還是不行，直到看到一篇文章寫，如果確定 VPS 供應商確認可以架設 VPN，那只要跟 VPS 供應商反應上述問題就可以了。<br />
小蛙睡前發了一張 ticket 給 ChicagoVPS，果真，白天就收到回覆「All set.」，果真搞定，但連上之後小蛙真的對 CentOS 太不熟了 &#8230; 操作起來綁手綁腳 &gt;&lt; 決定換回 Ubuntu，結束兩天的 CentOS 之旅 &#8230;</p>
<p>這篇文章 <a rel="nofollow" href="https://noter.tw/3309/centos-couldnt-open-the-devppp-device-permission-denied/" data-wpel-link="internal">CentOS &#8211; Couldn&#039;t open the /dev/ppp device: Permission denied</a> 最早出現於 <a rel="nofollow" href="https://noter.tw" data-wpel-link="internal">記下來</a>。</p>
]]></content:encoded>
					
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			<slash:comments>0</slash:comments>
		
		
			</item>
		<item>
		<title>透過  pptpd 架設 VPN</title>
		<link>https://noter.tw/3070/%e9%80%8f%e9%81%8e-pptpd-%e6%9e%b6%e8%a8%ad-vpn/</link>
					<comments>https://noter.tw/3070/%e9%80%8f%e9%81%8e-pptpd-%e6%9e%b6%e8%a8%ad-vpn/#comments</comments>
		
		<dc:creator><![CDATA[黃小蛙]]></dc:creator>
		<pubDate>Mon, 14 Oct 2013 08:31:47 +0000</pubDate>
				<category><![CDATA[Linux]]></category>
		<category><![CDATA[PPTP]]></category>
		<category><![CDATA[pptpd]]></category>
		<category><![CDATA[Ubuntu]]></category>
		<category><![CDATA[VPS]]></category>
		<category><![CDATA[iptables]]></category>
		<category><![CDATA[VPN]]></category>
		<category><![CDATA[BuyVM]]></category>
		<guid isPermaLink="false">http://wazai.net/?p=3070</guid>

					<description><![CDATA[<p>這篇文章很久以前就想 post 了，不過因為距離上次安裝的細節太遙遠，而且幾經波折才裝起來，有些設定檔亂亂的不確定對不對，正好最近換了新的 Ubuntu 主機，測試了一下把過程記錄下來。 參考資料中大&#46;&#46;&#46;</p>
<p>這篇文章 <a rel="nofollow" href="https://noter.tw/3070/%e9%80%8f%e9%81%8e-pptpd-%e6%9e%b6%e8%a8%ad-vpn/" data-wpel-link="internal">透過  pptpd 架設 VPN</a> 最早出現於 <a rel="nofollow" href="https://noter.tw" data-wpel-link="internal">記下來</a>。</p>
]]></description>
										<content:encoded><![CDATA[<p>這篇文章很久以前就想 post 了，不過因為距離上次安裝的細節太遙遠，而且幾經波折才裝起來，有些設定檔亂亂的不確定對不對，正好最近換了新的 Ubuntu 主機，測試了一下把過程記錄下來。 <span id="more-3070"></span><br>參考資料中大多是如何在 BuyVM 上架設 VPN，BuyVM 是同事介紹小蛙才知道的，他的在線率非常高、穩定度也不錯，而小蛙買的這個正是最熱門的方案，一年只要 $15 美金但相對的 RAM 只有 128 MB，對於一些比較大型的應用就沒有辦法了，雖然低規卻還是只要一空出來，馬上就又被搶光 &#8230; 小蛙把要裝的東西裝完之後發現記憶體根本已經爆掉 &#8230; 所以這台就當成小蛙好朋友阿年翻過大陸長城的 VPN Server 了。<br>當初會想架設 VPN 最大的原因是 Android Play Store 以前不開放台灣付費購買 app (現已經開放)，既然 VPN 已經架了，就放著當作測試機 (有些情況下會需要外國的 IP 來做測試)。之前放在 BuyVM 時，在租屋處連線經常連不上，Google 出可能是虛擬 IP 造成的，小蛙測試的結果虛擬 IP 會造成無法連線，阿年在大陸原本的 ISP 是配虛擬 IP，後來換了實體 IP 後確定可以，公司的電腦也是實體 IP 連線沒問題！小蛙對於系統面的東西不怎麼熟悉，花了很長的時間也還是不知道怎麼解，有高手大大知道的話，可以留言教教小蛙 &gt;&lt;<br><span style="line-height: 1.5em;">上教學！</span></p>
<ol>
<li>安裝 pptpd 套件
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<div class="line number1 index0 alt2"><code class="bash comments"># apt-get install pptpd</code></div>
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<li>設定 pptpd 要用的 IP 區段
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<div class="line number1 index0 alt2"><code class="bash comments"># vim /etc/pptpd.conf</code></div>
<div class="line number2 index1 alt1"><code class="bash comments"># 到最下面加入兩行</code></div>
<div class="line number3 index2 alt2"><code class="bash plain">localip 192.168.10.1</code></div>
<div class="line number4 index3 alt1"><code class="bash plain">remoteip 192.168.10.101-200</code></div>
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</li>
<li>編輯 pptpd 一些設定
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<div class="line number15 index14 alt2">15</div>
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<div class="line number1 index0 alt2"><code class="actionscript3 plain"># vim /etc/ppp/pptpd-options</code></div>
<div class="line number2 index1 alt1"><code class="actionscript3 plain">name pptpd</code></div>
<div class="line number3 index2 alt2"><code class="actionscript3 plain">refuse-pap</code></div>
<div class="line number4 index3 alt1"><code class="actionscript3 plain">refuse-chap</code></div>
<div class="line number5 index4 alt2"><code class="actionscript3 plain">refuse-mschap</code></div>
<div class="line number6 index5 alt1"><code class="actionscript3 plain">require-mschap-v2</code></div>
<div class="line number7 index6 alt2"><code class="actionscript3 plain">require-mppe-</code><code class="actionscript3 value">128</code></div>
<div class="line number8 index7 alt1"><code class="actionscript3 plain">proxyarp</code></div>
<div class="line number9 index8 alt2"><code class="actionscript3 plain">lock</code></div>
<div class="line number10 index9 alt1"><code class="actionscript3 plain">nobsdcomp</code></div>
<div class="line number11 index10 alt2"><code class="actionscript3 plain">novj</code></div>
<div class="line number12 index11 alt1"><code class="actionscript3 plain">novjccomp</code></div>
<div class="line number13 index12 alt2"><code class="actionscript3 plain">nologfd</code></div>
<div class="line number14 index13 alt1"><code class="actionscript3 plain">ms-dns </code><code class="actionscript3 value">8.8</code><code class="actionscript3 plain">.</code><code class="actionscript3 value">8.8</code></div>
<div class="line number15 index14 alt2"><code class="actionscript3 plain">ms-dns </code><code class="actionscript3 value">8.8</code><code class="actionscript3 plain">.</code><code class="actionscript3 value">4.4</code></div>
</div>
</td>
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</li>
<li>設定可登入的帳號密碼
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<div class="line number1 index0 alt2"><code class="bash comments"># vim /etc/ppp/chap-secrets</code></div>
<div class="line number2 index1 alt1"><code class="bash comments"># Secrets for authentication using CHAP</code></div>
<div class="line number3 index2 alt2"><code class="bash comments"># client&nbsp;&nbsp; server&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; secret&nbsp;&nbsp;&nbsp;&nbsp; IP addresses</code></div>
<div class="line number4 index3 alt1"><code class="bash comments"># 帳號名稱&nbsp; 服務名稱&nbsp;&nbsp;&nbsp;&nbsp; 密碼&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; IP</code></div>
<div class="line number5 index4 alt2"><code class="bash plain">bob&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pptpd&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1234&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; *</code></div>
<div class="line number6 index5 alt1"><code class="bash plain">alice&nbsp;&nbsp;&nbsp;&nbsp; pptpd&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; abcd&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; *</code></div>
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</li>
<li>開啟 IPv4 Forward 功能
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<div class="line number1 index0 alt2"><code class="bash comments"># vim /etc/sysctl.conf</code></div>
<div class="line number2 index1 alt1"><code class="bash comments"># 解除註解，並把值設定成 1</code></div>
<div class="line number3 index2 alt2"><code class="bash plain">net.ipv4.ip_forward=1</code></div>
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</div>
</li>
<li>讓剛剛的設定生效
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<div class="line number1 index0 alt2"><code class="bash comments"># sysctl -p</code></div>
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</li>
<li>設定 iptables
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<div class="line number1 index0 alt2"><code class="bash comments"># iptables -A INPUT -p tcp --dport 1723 -j ACCEPT</code></div>
<div class="line number2 index1 alt1"><code class="bash comments"># iptables -A INPUT -p 47 -j ACCEPT</code></div>
<div class="line number3 index2 alt2"><code class="bash comments"># iptables -t nat -A POSTROUTING -s 192.168.10.0/24 -j SNAT --to-source 對外IP</code></div>
<div class="line number4 index3 alt1"><code class="bash comments"># 如果是用 BuyVM 要加下面這行</code></div>
<div class="line number5 index4 alt2"><code class="bash comments"># iptables -A FORWARD -i ppp+ -o venet0 -j ACCEPT</code></div>
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</li>
<li>如果是用 VPS，要記得到 VPS 後台管理頁面把&nbsp;TUN/TAP, PPP 功能開啟 (不確定，如果有的話就開啟)</li>
<li>儲存 iptables 設定
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<div class="line number1 index0 alt2"><code class="bash comments"># iptables-save &gt; /etc/iptables.rules</code></div>
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</div>
</li>
<li>讓開機時自動載入 iptables 設定(否則剛剛的設定重開機後會失效喔)
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<div class="line number1 index0 alt2"><code class="bash comments"># vim /etc/rc.local</code></div>
<div class="line number2 index1 alt1"><code class="bash comments"># 在 exit 0 之前加入</code></div>
<div class="line number3 index2 alt2"><code class="bash plain">iptables-restore &lt; </code><code class="bash plain">/etc/iptables</code><code class="bash plain">.rules</code></div>
<div class="line number4 index3 alt1"><code class="bash functions">exit</code> <code class="bash plain">0</code></div>
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</li>
<li>重新啟動 pptpd
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<div class="line number1 index0 alt2"><code class="bash comments"># service pptpd restart</code></div>
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</li>
<li>如果有發生問題的話，打開偵錯模式看看錯誤訊息
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<div class="line number1 index0 alt2"><code class="bash comments"># vim /etc/ppp/pptpd-options</code></div>
<div class="line number2 index1 alt1"><code class="bash comments"># 把 debug 註解拿掉</code></div>
<div class="line number3 index2 alt2"><code class="bash plain">debug</code></div>
<div class="line number4 index3 alt1"><code class="bash comments"># 在這邊可以看到除錯訊息</code></div>
<div class="line number5 index4 alt2"><code class="bash comments"># tailf /var/log/debug</code></div>
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</div>
</div>
</li>
<li>接著設定連線試試看， 設定方式請參考&nbsp;<a href="https://noter.tw/2602/windows-%e8%a8%ad%e5%ae%9a-vpn-%e9%80%a3%e7%b7%9a/" target="_blank" rel="noopener noreferrer" data-wpel-link="internal">Windows 設定 VPN 連線</a>。</li>
<li>連上之後可以到 <a href="http://dir.twseo.org/ip-check.php" target="_blank" rel="noopener noreferrer nofollow external" data-wpel-link="external" class="wpel-icon-right">這裡<span class="wpel-icon wpel-image wpel-icon-6"></span></a> 看看 IP 是不是已經改變了！</li>
</ol>


<h2 class="para wp-block-heading">參考資料</h2>



<ul class="my-li bg-darkblue wp-block-list"><li><a href="http://disp.cc/b/11-GJv" target="_blank" rel="noopener nofollow external noreferrer" data-wpel-link="external" class="wpel-icon-right">[Ubuntu] 使用 pptpd 架設 VPN server @ Disp BBS 看板 Knuckles_note<span class="wpel-icon wpel-image wpel-icon-6"></span></a></li><li><a href="http://blog.marc-seeger.de/2011/03/18/setting-up-a-pptp-server-on-buyvm/" target="_blank" rel="noopener nofollow external noreferrer" data-wpel-link="external" class="wpel-icon-right">Setting Up a PPTP Server on BuyVM @ Marc&#8217;s Blog<span class="wpel-icon wpel-image wpel-icon-6"></span></a></li><li><a href="http://www.andyhuang.net/tools/buyvm/pptpvpn.html?ipaddress=a.b.c" target="_blank" rel="noopener nofollow external noreferrer" data-wpel-link="external" class="wpel-icon-right">Setting Up PPTP VPN on BuyVM VPS<span class="wpel-icon wpel-image wpel-icon-6"></span></a></li></ul>


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