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linux-tcpdump.html
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tcpdump
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<div class="post-description">some common tcpdump usages</div>
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<div class="post-body" itemprop="articleBody"><h1>some common tcpdump cli</h1>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment"># Reading / Writing Captures to a File</span></span><br><span class="line">tcpdump port 80 -w capture_file</span><br><span class="line"></span><br><span class="line"><span class="comment"># read PCAP files by using the -r switch</span></span><br><span class="line">tcpdump -r capture_file</span><br><span class="line"></span><br><span class="line"><span class="comment"># port 2000 of any nic</span></span><br><span class="line">tcpdump -i any port 2000 –nn</span><br><span class="line"></span><br><span class="line"><span class="comment"># Everything on an interface</span></span><br><span class="line">tcpdump -i eth0</span><br><span class="line"></span><br><span class="line"><span class="comment"># Find Traffic by IP</span></span><br><span class="line"><span class="comment"># One of the most common queries, using host, you can see traffic that’s going to or from 1.1.1.1.</span></span><br><span class="line">tcpdump host 1.1.1.1</span><br><span class="line"></span><br><span class="line"><span class="comment"># Filtering by Source and/or Destination</span></span><br><span class="line">tcpdump src 1.1.1.1</span><br><span class="line">tcpdump dst 1.0.0.1</span><br><span class="line"></span><br><span class="line"><span class="comment"># Finding Packets by Network</span></span><br><span class="line">tcpdump net 1.2.3.0/24</span><br><span class="line"></span><br><span class="line"><span class="comment"># Get Packet Contents with Hex Output</span></span><br><span class="line">tcpdump -c 1 -X icmp</span><br><span class="line"></span><br><span class="line"><span class="comment"># Show Traffic Related to a Specific Port</span></span><br><span class="line">tcpdump port 3389</span><br><span class="line">tcpdump src port 1025</span><br><span class="line"></span><br><span class="line"><span class="comment"># Show Traffic of One Protocol</span></span><br><span class="line">tcpdump icmp</span><br><span class="line"></span><br><span class="line"><span class="comment"># Show only IP6 Traffic</span></span><br><span class="line">tcpdump ip6</span><br><span class="line"></span><br><span class="line"><span class="comment"># Find Traffic Using Port Ranges</span></span><br><span class="line">tcpdump portrange 21-23</span><br><span class="line"></span><br><span class="line"><span class="comment"># Find Traffic Based on Packet Size</span></span><br><span class="line">tcpdump less 32</span><br><span class="line">tcpdump greater 64</span><br><span class="line">tcpdump <= 128</span><br><span class="line"></span><br><span class="line"><span class="comment"># ==================================</span></span><br><span class="line"></span><br><span class="line"><span class="comment"># It’s All About the Combinations</span></span><br><span class="line"></span><br><span class="line"><span class="comment"># ========= AND =========</span></span><br><span class="line"><span class="comment"># and or &&</span></span><br><span class="line"></span><br><span class="line"><span class="comment"># ========= OR =========</span></span><br><span class="line"><span class="comment"># or or ||</span></span><br><span class="line"></span><br><span class="line"><span class="comment"># ========= EXCEPT =========</span></span><br><span class="line"><span class="comment"># not or !</span></span><br><span class="line"></span><br><span class="line"><span class="comment"># From specific IP and destined for a specific Port</span></span><br><span class="line"><span class="comment"># Let’s find all traffic from 10.5.2.3 going to any host on port 3389.</span></span><br><span class="line">tcpdump -nnvvS src 10.5.2.3 and dst port 3389</span><br><span class="line"></span><br><span class="line"><span class="comment"># From One Network to Another</span></span><br><span class="line"><span class="comment"># Let’s look for all traffic coming from 192.168.x.x and going to the 10.x or 172.16.x.x networks</span></span><br><span class="line"><span class="comment"># and we’re showing hex output with no hostname resolution and one level of extra verbosity.</span></span><br><span class="line">tcpdump -nvX src net 192.168.0.0/16 and dst net 10.0.0.0/8 or 172.16.0.0/16</span><br><span class="line"></span><br><span class="line"><span class="comment"># Non ICMP Traffic Going to a Specific IP</span></span><br><span class="line"><span class="comment"># This will show us all traffic going to 192.168.0.2 that is not ICMP.</span></span><br><span class="line">tcpdump dst 192.168.0.2 && src ! icmp</span><br><span class="line">tcpdump dst 192.168.0.2 and src not icmp</span><br><span class="line"></span><br><span class="line"><span class="comment"># catch packages from(to) eth0 or eth1</span></span><br><span class="line">tcpdump -vi eth0 || eth1 -w tmp.pcap</span><br></pre></td></tr></table></figure>
<h1>Advanced</h1>
<h2 id="match-MAC-address-VLAN">match MAC address & VLAN</h2>
<ul>
<li>ether host <MAC> - capture packets sent from and to <MAC></li>
<li>ether src <MAC> - capture packets sent from <MAC></li>
<li>ether dst <MAC> - capture packets sent to <MAC></li>
<li>vlan <VLAN ID> - match <VLAN ID></li>
</ul>
<h2 id="match-protocol">match protocol</h2>
<p>Match protocols in L3 header:</p>
<ul>
<li><code>ip proto </code> - PROTO: icmp, icmp6, igmp, igrp, pim, ah, esp, vrrp, udp, or tcp</li>
</ul>
<p>Follow are abbreviations:</p>
<ul>
<li><code>icmp</code> = <code>proto icmp</code></li>
<li><code>tcp</code> = <code>proto tcp</code></li>
<li><code>udp</code> = <code>proto udp</code></li>
</ul>
<p>Match protocols in L2 header:</p>
<ul>
<li><code>ether proto </code> - PROTO: ip, ip6, arp, rarp, atalk, aarp, decnet, sca, lat, mopdl, moprc, iso, stp, ipx, or netbeui</li>
</ul>
<p>Follow are abbreviations:</p>
<ul>
<li><code>ip</code> = <code>ether proto ip</code></li>
<li><code>ip6</code> = <code>ether proto ip6</code></li>
<li><code>arp</code> = <code>ether proto arp</code></li>
<li><code>rarp</code> = <code>ether proto rarp</code></li>
</ul>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">tcpdump -i eth0 arp</span><br><span class="line">tcpdump -i eth0 icmp</span><br></pre></td></tr></table></figure>
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