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                        <h1 id="tcpdump1"><a class="header" href="#tcpdump1">tcpdump(1)</a></h1>
<h1 id="cli"><a class="header" href="#cli">CLI</a></h1>
<pre><code class="language-markdown">tcpdump [opts] -i &lt;if&gt; [&lt;filter&gt;]
    -n              Don't convert host/port names.
    -w &lt;file|-&gt;     Write pcap trace to file or stdout (-).
    -r &lt;file&gt;       Read &amp; parse pcap file.
</code></pre>
<p>Some useful filters, for the full syntax see <a href="https://www.tcpdump.org/manpages/pcap-filter.7.html">pcap-filter(7)</a>.</p>
<pre><code class="language-markdown">src &lt;ip&gt;                Filter for source IP.
dst &lt;ip&gt;                Filter for destination IP.
host &lt;ip&gt;               Filter for IP (src + dst).
net &lt;ip&gt;/&lt;range&gt;        Filter traffic on subnet.
[src/dst] port &lt;port&gt;   Filter for port (optionally src/dst).
tcp/udp/icmp            Filter for protocol.
</code></pre>
<blockquote>
<p>Use <code>and/or/not</code> and <code>()</code> to build filter expressions.</p>
</blockquote>
<h1 id="examples"><a class="header" href="#examples">Examples</a></h1>
<h2 id="capture-packets-from-remote-host"><a class="header" href="#capture-packets-from-remote-host">Capture packets from remote host</a></h2>
<pre><code class="language-makrdown"># -k: Start capturing immediately.
ssh &lt;host&gt; tcpdump -i any -w - | sudo wireshark -k -i -
</code></pre>
<blockquote>
<p>The <code>any</code> interface is a special keyword to capture traffic on all interfaces.</p>
</blockquote>

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                        <h1 id="tcpdump1"><a class="header" href="#tcpdump1">tcpdump(1)</a></h1>
<h1 id="cli"><a class="header" href="#cli">CLI</a></h1>
<pre><code class="language-markdown">tcpdump [opts] -i &lt;if&gt; [&lt;filter&gt;]
    -n              Don't convert host/port names.
    -w &lt;file|-&gt;     Write pcap trace to file or stdout (-).
    -r &lt;file&gt;       Read &amp; parse pcap file.
</code></pre>
<p>Some useful filters, for the full syntax see <a href="https://www.tcpdump.org/manpages/pcap-filter.7.html">pcap-filter(7)</a>.</p>
<pre><code class="language-markdown">src &lt;ip&gt;                Filter for source IP.
dst &lt;ip&gt;                Filter for destination IP.
host &lt;ip&gt;               Filter for IP (src + dst).
net &lt;ip&gt;/&lt;range&gt;        Filter traffic on subnet.
[src/dst] port &lt;port&gt;   Filter for port (optionally src/dst).
tcp/udp/icmp            Filter for protocol.
</code></pre>
<blockquote>
<p>Use <code>and/or/not</code> and <code>()</code> to build filter expressions.</p>
</blockquote>
<h1 id="examples"><a class="header" href="#examples">Examples</a></h1>
<h2 id="capture-packets-from-remote-host"><a class="header" href="#capture-packets-from-remote-host">Capture packets from remote host</a></h2>
<pre><code class="language-makrdown"># -k: Start capturing immediately.
ssh &lt;host&gt; tcpdump -i any -w - | sudo wireshark -k -i -
</code></pre>
<blockquote>
<p>The <code>any</code> interface is a special keyword to capture traffic on all interfaces.</p>
</blockquote>

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