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	<title>iptables &#8211; 記下來</title>
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	<title>iptables &#8211; 記下來</title>
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	<item>
		<title>自己被 fail2ban 封鎖的解決方法</title>
		<link>https://noter.tw/259/%e8%87%aa%e5%b7%b1%e8%a2%ab-fail2ban-%e5%b0%81%e9%8e%96%e7%9a%84%e8%a7%a3%e6%b1%ba%e6%96%b9%e6%b3%95/</link>
					<comments>https://noter.tw/259/%e8%87%aa%e5%b7%b1%e8%a2%ab-fail2ban-%e5%b0%81%e9%8e%96%e7%9a%84%e8%a7%a3%e6%b1%ba%e6%96%b9%e6%b3%95/#respond</comments>
		
		<dc:creator><![CDATA[黃小蛙]]></dc:creator>
		<pubDate>Mon, 26 Nov 2018 14:31:44 +0000</pubDate>
				<category><![CDATA[Linux]]></category>
		<category><![CDATA[fail2ban]]></category>
		<category><![CDATA[iptables]]></category>
		<category><![CDATA[封鎖]]></category>
		<guid isPermaLink="false">https://noter.tw/?p=259</guid>

					<description><![CDATA[<p>昨天小蛙在測試 Visual Studio Code 的 SFTP 插件時，因為設定錯誤不小心被自己 VPS 上的 fail2ban 給 ban 掉了 &#8230; 這篇記錄解決的方法。 fail2&#46;&#46;&#46;</p>
<p>這篇文章 <a rel="nofollow" href="https://noter.tw/259/%e8%87%aa%e5%b7%b1%e8%a2%ab-fail2ban-%e5%b0%81%e9%8e%96%e7%9a%84%e8%a7%a3%e6%b1%ba%e6%96%b9%e6%b3%95/" data-wpel-link="internal">自己被 fail2ban 封鎖的解決方法</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>昨天小蛙在測試 Visual Studio Code 的 SFTP 插件時，因為設定錯誤不小心被自己 VPS 上的 fail2ban 給 ban 掉了 &#8230; 這篇記錄解決的方法。 </p>



<span id="more-259"></span>



<p>fail2ban 是一個防護工具，可以設定某些連線方式，錯誤達到特定次數時，將該 IP 封鎖設指定時間，在開放的網路中，只要去看 log 就可以發現，主機是時時被不知道哪來的機器嘗試登入啊！</p>



<div class="wp-block-image"><figure class="aligncenter"><img decoding="async" src="https://noter.tw/wp-content/uploads/2018/06/fail2ban-jail-1024x537.png" alt="fail2ban jail 自己被 fail2ban 封鎖的解決方法" class="wp-image-3996" title="自己被 fail2ban 封鎖的解決方法"></figure></div>



<p>水可載舟亦可覆舟，昨天小蛙要測試 VSC sftp 插件的時候，設定錯誤造成太多登入失敗的狀況，結果自己的 IP 被自己的 VPS 封鎖了，想連上去都沒辦法，還好一般 VPS 供應商都會提供一個後台可以讓你沒辦法登入的時候，可以透過後台做一些操作，像是重啟、關機、重裝 OS &#8230; 等功能，還有額外提供一個 Serial Console 的功能，直接在網頁上遠端進去主機做一些操作。</p>



<p>先到 <a rel="noreferrer noopener nofollow external" href="http://www.whatismyip.com.tw/" target="_blank" data-wpel-link="external" class="wpel-icon-right">這邊<span class="wpel-icon wpel-image wpel-icon-6"></span></a> 查詢自己的 IP，因為小蛙已經沒有辦法透過 pietty 登入了，只能透過 Serial Console 來操控機器，連進主機之後，透過以下指令可以看到是不是自己的 IP 真的被封鎖了，還是另有其他問題。</p>



<pre class="wp-block-preformatted wp-block-syntaxhighlighter-code"># iptables -nvL | grep 目前使用的 IP </pre>



<p>如果有的話，可以用以下指令解禁 </p>



<pre class="wp-block-preformatted wp-block-syntaxhighlighter-code">// 查看目前有哪些 jail 設定 
# fail2ban-client status 

// 解鎖 
# fail2ban-client set sshd unbanip 要解鎖的 IP</pre>



<figure class="wp-block-image"><img decoding="async" src="https://noter.tw/wp-content/uploads/2018/06/fail2ban.png" alt="fail2ban 自己被 fail2ban 封鎖的解決方法" class="wp-image-3997" title="自己被 fail2ban 封鎖的解決方法"></figure>



<h2 class="para wp-block-heading">參考資料</h2>



<ul class="my-li bg-darkblue wp-block-list"><li><a rel="noreferrer noopener nofollow external" href="https://www.phpini.com/linux/manually-unban-fail2ban-ip" target="_blank" data-wpel-link="external" class="wpel-icon-right">手動解除 Fail2ban 封鎖的 IP &#8211; Linux 技術手札<span class="wpel-icon wpel-image wpel-icon-6"></span></a></li></ul>



<p><strong>fail2ban 系列：</strong></p>



<ul class="my-li bg-darkblue wp-block-list"><li><a href="https://noter.tw/255/ubuntu-16-04-安裝-fail2ban/" data-wpel-link="internal">Ubuntu 16.04 安裝 fail2ban</a></li><li><a href="https://noter.tw/54/%e8%ae%93-fail2ban-%e5%8f%af%e4%bb%a5%e8%a8%ad%e5%ae%9a%e6%b0%b8%e4%b9%85-ban-%e5%90%8d%e5%96%ae/" data-wpel-link="internal">讓 fail2ban 可以設定永久 ban 名單</a></li><li><a href="https://noter.tw/259/%E8%87%AA%E5%B7%B1%E8%A2%AB-fail2ban-%E5%B0%81%E9%8E%96%E7%9A%84%E8%A7%A3%E6%B1%BA%E6%96%B9%E6%B3%95/" data-wpel-link="internal">自己被 fail2ban 封鎖的解決方法</a></li></ul>
<p>這篇文章 <a rel="nofollow" href="https://noter.tw/259/%e8%87%aa%e5%b7%b1%e8%a2%ab-fail2ban-%e5%b0%81%e9%8e%96%e7%9a%84%e8%a7%a3%e6%b1%ba%e6%96%b9%e6%b3%95/" data-wpel-link="internal">自己被 fail2ban 封鎖的解決方法</a> 最早出現於 <a rel="nofollow" href="https://noter.tw" data-wpel-link="internal">記下來</a>。</p>
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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[BuyVM]]></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>
		<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
<div>
<div id="highlighter_776496" class="syntaxhighlighter  bash">
<table border="0" cellspacing="0" cellpadding="0">
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<div class="line number1 index0 alt2">1</div>
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<div class="line number1 index0 alt2"><code class="bash comments"># apt-get install pptpd</code></div>
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</tbody>
</table>
</div>
</div>
</li>
<li>設定 pptpd 要用的 IP 區段
<div>
<div id="highlighter_345873" class="syntaxhighlighter  bash">
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<div class="container">
<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>
</div>
</td>
</tr>
</tbody>
</table>
</div>
</div>
</li>
<li>編輯 pptpd 一些設定
<div>
<div id="highlighter_286674" class="syntaxhighlighter  actionscript3">
<table border="0" cellspacing="0" cellpadding="0">
<tbody>
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<td class="gutter">
<div class="line number1 index0 alt2">01</div>
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<div class="line number7 index6 alt2">07</div>
<div class="line number8 index7 alt1">08</div>
<div class="line number9 index8 alt2">09</div>
<div class="line number10 index9 alt1">10</div>
<div class="line number11 index10 alt2">11</div>
<div class="line number12 index11 alt1">12</div>
<div class="line number13 index12 alt2">13</div>
<div class="line number14 index13 alt1">14</div>
<div class="line number15 index14 alt2">15</div>
</td>
<td class="code">
<div class="container">
<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>
</tr>
</tbody>
</table>
</div>
</div>
</li>
<li>設定可登入的帳號密碼
<div>
<div id="highlighter_473659" class="syntaxhighlighter  bash">
<table border="0" cellspacing="0" cellpadding="0">
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<td class="gutter">
<div class="line number1 index0 alt2">1</div>
<div class="line number2 index1 alt1">2</div>
<div class="line number3 index2 alt2">3</div>
<div class="line number4 index3 alt1">4</div>
<div class="line number5 index4 alt2">5</div>
<div class="line number6 index5 alt1">6</div>
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<td class="code">
<div class="container">
<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>
</div>
</td>
</tr>
</tbody>
</table>
</div>
</div>
</li>
<li>開啟 IPv4 Forward 功能
<div>
<div id="highlighter_182162" class="syntaxhighlighter  bash">
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<tbody>
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<td class="gutter">
<div class="line number1 index0 alt2">1</div>
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<div class="line number3 index2 alt2">3</div>
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<td class="code">
<div class="container">
<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>
</div>
</td>
</tr>
</tbody>
</table>
</div>
</div>
</li>
<li>讓剛剛的設定生效
<div>
<div id="highlighter_901351" class="syntaxhighlighter  bash">
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<div class="line number1 index0 alt2"><code class="bash comments"># sysctl -p</code></div>
</div>
</td>
</tr>
</tbody>
</table>
</div>
</div>
</li>
<li>設定 iptables
<div>
<div id="highlighter_493238" class="syntaxhighlighter  bash">
<table border="0" cellspacing="0" cellpadding="0">
<tbody>
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<td class="gutter">
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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>
</div>
</td>
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</tbody>
</table>
</div>
</div>
</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
<div>
<div id="highlighter_204554" class="syntaxhighlighter  bash">
<table border="0" cellspacing="0" cellpadding="0">
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<td class="gutter">
<div class="line number1 index0 alt2">1</div>
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<div class="line number1 index0 alt2"><code class="bash comments"># iptables-save &gt; /etc/iptables.rules</code></div>
</div>
</td>
</tr>
</tbody>
</table>
</div>
</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)
<div>
<div id="highlighter_213731" class="syntaxhighlighter  bash">
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<td class="code">
<div class="container">
<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>
</div>
</td>
</tr>
</tbody>
</table>
</div>
</div>
</li>
<li>重新啟動 pptpd
<div>
<div id="highlighter_763756" class="syntaxhighlighter  bash">
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<tbody>
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<div class="line number1 index0 alt2">1</div>
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<td class="code">
<div class="container">
<div class="line number1 index0 alt2"><code class="bash comments"># service pptpd restart</code></div>
</div>
</td>
</tr>
</tbody>
</table>
</div>
</div>
</li>
<li>如果有發生問題的話，打開偵錯模式看看錯誤訊息
<div>
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<div class="line number1 index0 alt2">1</div>
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<div class="line number3 index2 alt2">3</div>
<div class="line number4 index3 alt1">4</div>
<div class="line number5 index4 alt2">5</div>
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<td class="code">
<div class="container">
<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>
</div>
</td>
</tr>
</tbody>
</table>
</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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