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<a class="post-title-link" href="/2016/08/15/syn-no-response/" itemprop="url">
服务器不响应SYN的原因
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<p>最近碰到过两次服务器不响应SYN包的情况,刚开始感觉真的是莫名其妙,解决过程也是挺纠结的,记录一下:</p>
<ul>
<li>iptables问题</li>
</ul>
<p>同样的iptables策略在阿里云服务器上没有问题,但是在AWS EC2上就有问题,现象之一就是外部服务器可以跟服务器端口通信,但是同一VPC内部的服务器访问时,端口不通;</p>
<p>经过排查,问题定位在iptables策略上,只能一条一条排查,最终发现问题出在这两条策略上:</p>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div></pre></td><td class="code"><pre><div class="line">iptables -A INPUT -p tcp -m ttl --ttl<span class="_">-lt</span> 5 -j DROP</div><div class="line">iptables -A INPUT -p tcp -m ttl --ttl<span class="_">-gt</span> 128 -j DROP</div></pre></td></tr></table></figure>
<p>原来是Amazon Linux系统的TTL默认值是255,不在5 - 128 范围之内,所以被服务器直接丢弃了,这两条策略也是从网上不知道哪里抄来的,把服务器收到的包TTL限制在5 - 128之间,想想真是后患无穷啊!</p>
<ul>
<li>net.ipv4.tcp_tw_recycle</li>
</ul>
<p>这个内核参数,网上搜搜,都建议打开,可以快速回收timewait连接,刚开始我也是设置的打开,导致的问题就是,公司内部访问服务器时,有的设备可以通信,有的设备端口不通,我的建议是不打开,否则nat网络后端的设备访问时就会出现异常,详细原因就不说了,自行google。</p>
<p>总结一下,网上的参数不可以随便拿来用呀,一定要搞清楚再用。</p>
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Windows nodejs prefix变量设置
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<p>linux下,nodejs安装完成后,prefix变量值为nodejs安装目录,这样<code>npm install -g</code> 安装的包都会在安装目录下;</p>
<p>但是在win下,默认的prefix值并不是nodejs的安装目录,而是<code>C:\Users\username\AppData\Roaming</code>,然后<code>npm install -g</code>安装的包都会在<code>C:\Users\username\AppData\Roaming\npm</code>下,感觉还是放在安装目录比较好,也方便把配置好的整个nodejs环境部署到其他电脑;</p>
<p>方法很简单:</p>
<p>打开nodejs的安装目录下的这个文件,<code>D:\svr\nodejs\node_modules\npm\npmrc</code>,文件内容如下:</p>
<pre><code class="batch">prefix=${APPDATA}\npm
</code></pre>
<p>注释这行即可,或者直接删掉这个文件</p>
<pre><code class="batch">; prefix=${APPDATA}\npm
</code></pre>
<p>然后执行这个命令确认一下:</p>
<pre><code class="batch">npm config ls -l
</code></pre>
<p>可以看出来,其实npm的prefix默认值就是nodejs安装目录,只是这个配置文件覆盖了默认值。</p>
<p>还有个需要注意的地方就是,之前的nodejs版本如果设置prefix为nodejs安装目录,npm命令执行会报错,v4.4.7版本已经没有这个问题了。</p>
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Hello World
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2016-08-11
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<p>好久没写过东西了,对技术的热情也有一些消退,希望这个blog能让我持续对技术保持热情。</p>
<p><img src="/images/catpower.jpg" alt="Cat Power"></p>
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<a class="post-title-link" href="/2012/05/17/win-route-fail/" itemprop="url">
Windows route命令提示"路由添加失败:找不到元素"原因分析
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2012-05-17
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<blockquote>
<p>这篇文章是从我的百度博客迁过来的</p>
</blockquote>
<p>实验需要,在电脑上弄了两个Loopback接口,并分配了不同网段的地址,但是在宿主机与客户机通信时,第一个包总是很慢,于是想到了添加静态路由,但是又发现windows下的route命令真是很难搞,总是报莫名奇妙的错误,其中一个就是添加路由时提示“路由添加失败: 找不到元素。”,折磨了很久,终于发现了个中原因:</p>
<p>其实原因很简单,就是命令不完整,一条完整的route命令应该像这样:</p>
<figure class="highlight bat"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line">route add <span class="number">0</span>.<span class="number">0</span>.<span class="number">0</span>.<span class="number">0</span> mask <span class="number">0</span>.<span class="number">0</span>.<span class="number">0</span>.<span class="number">0</span> <span class="number">192</span>.<span class="number">168</span>.<span class="number">1</span>.<span class="number">1</span> metric <span class="number">1</span> <span class="keyword">IF</span> <span class="number">31</span></div></pre></td></tr></table></figure>
<p>其中,192.168.1.1是网关,IF 31是接口,这个接口在电脑有多个网卡时是必不可少的,因为你需要确定一条路由是从哪个接口进来和出去的,31就是执行route print后,每个网卡前面的第一个省略号前面的数字。</p>
<p>这样,在同时需要连接内网和外网时,可以把外网的网关设为默认网关,内网的网段一一添加到静态路由中,比方说我的路由如下:</p>
<figure class="highlight bat"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div></pre></td><td class="code"><pre><div class="line">route -f</div><div class="line">route add <span class="number">0</span>.<span class="number">0</span>.<span class="number">0</span>.<span class="number">0</span> mask <span class="number">0</span>.<span class="number">0</span>.<span class="number">0</span>.<span class="number">0</span> <span class="number">192</span>.<span class="number">168</span>.<span class="number">1</span>.<span class="number">1</span> metric <span class="number">1</span> <span class="keyword">IF</span> <span class="number">31</span></div><div class="line">route add <span class="number">192</span>.<span class="number">168</span>.<span class="number">1</span>.<span class="number">0</span> mask <span class="number">255</span>.<span class="number">255</span>.<span class="number">255</span>.<span class="number">0</span> <span class="number">192</span>.<span class="number">168</span>.<span class="number">1</span>.<span class="number">119</span> <span class="keyword">IF</span> <span class="number">17</span></div><div class="line">route add <span class="number">192</span>.<span class="number">168</span>.<span class="number">2</span>.<span class="number">0</span> mask <span class="number">255</span>.<span class="number">255</span>.<span class="number">255</span>.<span class="number">0</span> <span class="number">192</span>.<span class="number">168</span>.<span class="number">2</span>.<span class="number">119</span> <span class="keyword">IF</span> <span class="number">18</span></div></pre></td></tr></table></figure>
<p>192.168.1.119 和192.168.2.119 分别为我的两个Loopback接口的IP地址,这个和后面的IF需要是对应的。</p>
<p>我的IF也贴出来如下:</p>
<figure class="highlight bat"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div></pre></td><td class="code"><pre><div class="line"><span class="function">C:\<span class="title">Users</span>><span class="title">route</span> <span class="title">print</span></span></div><div class="line">===========================================================================</div><div class="line">接口列表</div><div class="line">31...20 7<span class="title">c</span> 8<span class="title">f</span> 61 73 <span class="title">d0</span> ......<span class="title">Qualcomm</span> <span class="title">Atheros</span> <span class="title">AR5B97</span> <span class="title">Wireless</span> <span class="title">Network</span> <span class="title">Adapter</span></div><div class="line">20...<span class="title">f8</span> <span class="title">f8</span> <span class="title">f8</span> <span class="title">f8</span> <span class="title">f8</span> <span class="title">f8</span> ......<span class="title">Sangfor</span> <span class="title">VPN</span> <span class="title">virtual</span> <span class="title">network</span> <span class="title">adapter</span></div><div class="line">18...02 00 4<span class="title">c</span> 4<span class="title">f</span> 4<span class="title">f</span> 50 ......<span class="title">Microsoft</span> <span class="title">Loopback</span> <span class="title">Adapter</span> #2</div><div class="line">17...02 00 4<span class="title">c</span> 4<span class="title">f</span> 4<span class="title">f</span> 50 ......<span class="title">Microsoft</span> <span class="title">Loopback</span> <span class="title">Adapter</span></div><div class="line">12...20 6<span class="title">a</span> 8<span class="title">a</span> 39 <span class="title">e4</span> 7<span class="title">a</span> ......<span class="title">Broadcom</span> <span class="title">NetLink</span> (<span class="title">TM</span>) <span class="title">Gigabit</span> <span class="title">Ethernet</span></div><div class="line">27...08 00 27 00 44 <span class="title">fc</span> ......<span class="title">VirtualBox</span> <span class="title">Host</span>-<span class="title">Only</span> <span class="title">Ethernet</span> <span class="title">Adapter</span></div><div class="line">28...00 50 56 <span class="title">c0</span> 00 08 ......<span class="title">VMware</span> <span class="title">Virtual</span> <span class="title">Ethernet</span> <span class="title">Adapter</span> <span class="title">for</span> <span class="title">VMnet8</span></div><div class="line">1...........................<span class="title">Software</span> <span class="title">Loopback</span> <span class="title">Interface</span> 1</div><div class="line">13...00 00 00 00 00 00 00 <span class="title">e0</span> <span class="title">Microsoft</span> <span class="title">ISATAP</span> <span class="title">Adapter</span></div><div class="line">15...00 00 00 00 00 00 00 <span class="title">e0</span> <span class="title">Microsoft</span> <span class="title">ISATAP</span> <span class="title">Adapter</span> #2</div><div class="line">10...00 00 00 00 00 00 00 <span class="title">e0</span> <span class="title">Microsoft</span> <span class="title">Teredo</span> <span class="title">Tunneling</span> <span class="title">Adapter</span></div><div class="line">14...00 00 00 00 00 00 00 <span class="title">e0</span> <span class="title">Microsoft</span> <span class="title">ISATAP</span> <span class="title">Adapter</span> #3</div></pre></td></tr></table></figure>
<p>windows的route命令帮助写的真烂,坑爹啊,折腾好几个晚上了,就这个问题。</p>
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