====== tcpdump ======
<code bash>
$ sudo tcpdump -nSt host example.com
</code>

<code bash>
$ sudo tcpdump -ne host 203.0.113.50 and tcp port ! 22
</code>

<code bash>
$ sudo tcpdump -n host 203.0.113.53 and udp port 53
</code>

<code bash>
$ sudo tcpdump -n icmp and host 203.0.113.1 -v
</code>

<code bash>
$ sudo tcpdump -w 0001.pcap -i eth0
</code>

<code bash>
$ sudo tcpdump -r 0001.pcap
</code>

<code bash>
$ sudo tcpdump -w 0002.pcap -i eth0 -n port 53
</code>

<code bash>
$ sudo tcpdump -r 0002.pcap
</code>
====== Flags ======
  * **Flags [S]** - flag SYN inicia conexão.