I need to take a few minutes to explain an important part of
this course before continuing because it's going to be
central to your learning experience.
No protocol deep dive would be complete without a detailed
packet analysis of the protocol in question.
Rather than recite protocol specifications or
reconstruct packet formats in PowerPoint,
I would rather show you the first-hand proof.
To do that, I'll be using Wireshark.
The lab topology that I've set up has Wireshark capabilities between links.
I'll be capturing traffic on the link between the Globomantics client and R1,
unless otherwise noted.
The demonstration I just completed was captured and the next two clips are going
to deep dive the FTP active mode exchanges using that tool.
If you don't know how to use Wireshark, don't have it available,
or frankly just want to learn about FTP right now,
that's okay.
I'll be using screenshots from Wireshark embedded in the
presentation to avoid the awkwardness of clicking and
expanding packet details in real time.
That will help us focus on the topic at hand with minimal distraction.
For those interested in performing your own dissection of the packets,
I'll post all packet captures used in this course on
Pluralsight for your extracurricular learning.
I've stripped down the packet captures to only the
relevant packets to keep them both small in size and
easier to digest for learning purposes. You can download Wireshark at wireshark.org for free.