https://adurrr.github.io/en/tags/tools/Recent content in Tools on AdurHugo -- gohugo.ioenThu, 21 Oct 2021 00:00:00 +0000https://adurrr.github.io/en/p/useful-commands-for-gnu/linux-system-administration/Thu, 21 Oct 2021 00:00:00 +0000https://adurrr.github.io/en/p/useful-commands-for-gnu/linux-system-administration/<p>This post covers several useful commands for system administration.</p> <h2 id="query-network-information">Query network information </h2><div class="highlight"><div class="chroma"> <table class="lntable"><tr><td class="lntd"> <pre tabindex="0" class="chroma"><code><span class="lnt">1 </span></code></pre></td> <td class="lntd"> <pre tabindex="0" class="chroma"><code class="language-fallback" data-lang="fallback"><span class="line"><span class="cl">ip a </span></span></code></pre></td></tr></table> </div> </div><h2 id="monitor-tcp-traffic">Monitor TCP traffic </h2><div class="highlight"><div class="chroma"> <table class="lntable"><tr><td class="lntd"> <pre tabindex="0" class="chroma"><code><span class="lnt">1 </span></code></pre></td> <td class="lntd"> <pre tabindex="0" class="chroma"><code class="language-fallback" data-lang="fallback"><span class="line"><span class="cl">sudo tcpdump -i &lt;device&gt; </span></span></code></pre></td></tr></table> </div> </div><h2 id="delete-the-default-route">Delete the default route </h2><div class="highlight"><div class="chroma"> <table class="lntable"><tr><td class="lntd"> <pre tabindex="0" class="chroma"><code><span class="lnt">1 </span></code></pre></td> <td class="lntd"> <pre tabindex="0" class="chroma"><code class="language-fallback" data-lang="fallback"><span class="line"><span class="cl">sudo ip route del default via 192.168.1.1 </span></span></code></pre></td></tr></table> </div> </div>