2026-04-12 14-35-44

May 25, 2026 13:44 · 13:03 · English · Whisper Turbo · 2 Locutores
Haec pagina de translatio explicat. Despectus in Viam Permanentem →
Index communium praefecturae Leptis Magnae
Videtur solum
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Wireshark is one of the most popular and
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most widely used applications when it comes to capturing
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packets and performing packet analysis.
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So in this video,
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we're going to take a look at some of the capturing
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abilities within Wireshark and what those packets look
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like.
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Before we get into it,
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just a couple of quick notes about Wireshark.
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First of all, when we're talking about capturing packets,
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it's only going to be able to capture packets that are communicating
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with the machine Wireshark is installed on,
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either as the source
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or the destination when we're talking about capturing packets.
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Of course, with analysis,
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if we're looking at a previously captured file,
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a PCAP file,
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or any other format of packet capture file,
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we can examine packets from any computer.
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It doesn't matter which one they came from as long as they were
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properly captured.
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It only applies to the analysis for the current
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live machine.
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Wireshark has a number of ways to kind of filter out data
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that is both captured and displayed using different
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syntax for each.
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For capture filter or for capturing packets,
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you have what you're called your capture filters,
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very appropriate name.
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And they are designed to limit the amount of data that
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is captured and saved using Wireshark.
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This is a live filter and it does affect what
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information is actually saved or analyzed by a Wireshark
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and what can be saved into a PCAP file.
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The benefit for capture filters is that it does reduce
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the processing requirements for Wireshark and makes it easier to
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run on a lower end machine,
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and it also can help reduce the size of the file
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that is that is saved after the capture is complete.
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Now you do have the side effect there of
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If the traffic that is on the machine is
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not included in that capture file,
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it is not going to be seen by Wireshark.
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It is not going to be saved in the PCAP.
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So something to keep in mind when you are working with
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capture filters.
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And you also have display filters.
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These can be used either while capturing or they can be used
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during the packet analysis phase,
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either immediately after a packet capture or while you're capturing
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packets or from a previously saved capture
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session.
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Display filters don't reduce any of the processing overhead
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for Wireshark.
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They don't affect the information that is in.
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the capture or anything like that.
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They are only kind of filtering out the information
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that is shown to you,
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as the name implies,
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with a display filter.
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Now from the analysis component of Wireshark,
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you have what is known as a feature called follow stream.
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Now this is a feature that makes it a lot easier
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to analyze information that Wireshark has captured.
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Basically,
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and we'll take a look at this in more detail when we get into the video for analysis
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using Wireshark.
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But essentially, you are able to pick a specific packet from the list
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of packets and select that one to follow
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the stream.
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And it will follow that exact either TCP or UDP
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path or whatever it is,
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that communication path,
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and only show data from that specific stream.
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which helps filter out a lot of the additional information that
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you may not really,
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really care about at that moment.
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Now, it doesn't remove it from the capture.
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It does not remove it from a previously captured
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file or anything like that.
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FollowStream is a type of display filter,
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and we'll see how this works again later on
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when we start looking at analysis with Wireshark.
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So let's go ahead and switch over to our lab environment,
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and we're going to take a look at how the capture process works in Wireshark.
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Alright, so here in our lab environment,
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we have the Wireshark.
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This is the kind of screen you see when you first launch Wireshark.
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This is the capture screen.
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So the options we see here,
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we see various interfaces that can be used as
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the capture.
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We're going to focus on the ETH01 right here.
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We see a section here to enter a filter for
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the capture.
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We're going to leave this blank as the initial capture.
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capture we do,
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and then we see when we can enter the display filters as
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well.
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So the toolbar up here,
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you have the option to start the capture,
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stop the capture,
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here's a restart,
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open a previous capture file,
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and so forth.
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So what we're going to do is we're going to start out on each zero.
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We're going to use no capture filter,
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so it'll capture all packets,
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and we're going to go ahead and start the capture and see what we get.
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We see we get a lot of requests and replies.
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And we're going to take a look at a few tasks
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on this machine.
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Starting with,
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we are going to ping another machine.
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We are going to ping this 192 .168
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.1 address.
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Give that a few packets.
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I'm going to do just kind of a few different tasks here.
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And then we're going to kind of look at the information that was
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captured.
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Next, I'm going to ping this lab machine.
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from another machine.
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So you're not actually seeing anything on the screen here.
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That is complete.
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We're going to do a quick lookup,
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DNS lookup.
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So we will look up,
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let's just do google .com.
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There's that information.
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And then we're going to do a little bit of web browsing.
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We're going to start with going to,
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let's look at never SSL.
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So get an HTTP site and then
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we're going to look at a HTTPS
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site and we are just kind of looking at
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the information here.
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So let's switch back over to Wireshark,
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stop the capture,
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and we'll see what all we got.
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And you can see here we got a large amount of information.
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We have 1 ,065 packets that were captured,
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as you can see right here at the bottom of the screen.
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And you can also see that all of them are being displayed
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as well.
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So we have no display filter or any other filters in
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place at the moment.
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So we see some ARP requests and replies.
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Scroll down a little bit here.
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A lot of just general information,
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and we see our ping requests going to the IP
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address we ping,
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the 192 .168 .1 .1,
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and we see the ping reply,
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the echo reply here.
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And we see,
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since we did a few of them,
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we see a number of these replies and requests in addition
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to more ARP requests and replies.
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Scroll down here.
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The next thing we did was to ping this system from
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another one.
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So we should see that here shortly.
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Here we go.
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So we have the source of the IP address.
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This is the machine I pinged from,
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pinging the IP address of this machine.
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So we can see the incoming request followed immediately by
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the reply here.
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Now,
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as far as the Wireshark interface itself,
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let's scroll down,
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look for the HTTP packets.
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Here we go.
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As far as the Wireshark display itself,
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we have a lot of information we can display here about the information
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of the specific packet.
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We still have the ping reply highlighted,
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and we can see all that information.
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We'll get into more detail on these bottom panes as
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we start looking at the analysis for
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Wireshark as well.
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And then we have the kind of raw data of the request on the right
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-hand side in hex format and in raw format as well.
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So let's see.
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We also have the DNS requests we did.
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So we have the query response for our DNS.
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We have a few of those.
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And then we have our HTTP requests
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as well and HTTPS.
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So we have some TLS exchanges happening here.
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Let's see.
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We have manually sorting through this
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can be a bit difficult at
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times, which is where the display filters come in.
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Again,
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we're going to get into the display filters more as we go
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through the course.
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We see a lot of TLS information here.
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Let's see a lot of more DNS,
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some additional TCP exchanges.
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So you can see there's a lot of information
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that is captured in just the one simple capture that
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we did.
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So let's do a new capture.
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We're going to close this capture,
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and we're going to do a new capture,
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but this time we're going to do it with a capture filter.
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So the filter we're going to enter,
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make sure we have our interface selected here,
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and we do.
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The filter we're going to enter is we're going to do a filter that only is
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going to display HTTP traffic.
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So we do TCP,
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because that's what HTTP is,
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port 80.
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You can also do port HTTP.
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The key indicator here that if you know
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you have the filter set up properly is the bar turns
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green.
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So if we say removed the port number,
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we then have a red bar indicator,
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a red input field,
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indicating that there is something wrong with this capture filter.
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It is not the right syntax.
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Either there's something missing or it's just incorrect completely.
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But we have the port number again and we're good.
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So we're going to go ahead and start the capture.
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And we see no packets flowing through.
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We're going to do another ping.
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I'm going to leave that ping running.
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And we see we have absolutely no information being displayed
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in Wireshark because it does not match the filter,
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the capture filter we have set up.
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So we'll come back over here.
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S… Speaker 1 (2026-04-12 14-35-44)
We're going to just refresh this page right here,
11:14
S… Speaker 2 (2026-04-12 14-35-44)
and this is an HTTPS site.
11:17
S… Speaker 2 (2026-04-12 14-35-44)
Refreshed it,
11:18
S… Speaker 2 (2026-04-12 14-35-44)
and we have zero information being displayed as well.
11:21
S… Speaker 2 (2026-04-12 14-35-44)
No packets recorded in Wireshark because,
11:24
S… Speaker 2 (2026-04-12 14-35-44)
again, it does not match the capture filter.
11:27
S… Speaker 1 (2026-04-12 14-35-44)
However,
11:29
S… Speaker 2 (2026-04-12 14-35-44)
if we connect back to NeverSSL here,
11:31
S… Speaker 1 (2026-04-12 14-35-44)
which,
11:32
S… Speaker 2 (2026-04-12 14-35-44)
as the name implies,
11:33
S… Speaker 2 (2026-04-12 14-35-44)
does not use SSL,
11:36
S… Speaker 2 (2026-04-12 14-35-44)
We then see a lot of HTTP information.
11:40
S… Speaker 2 (2026-04-12 14-35-44)
Come back over here and stop the packets.
11:42
S… Speaker 2 (2026-04-12 14-35-44)
We see a lot of information.
11:45
S… Speaker 2 (2026-04-12 14-35-44)
We see the TCP coming out from our machine to the destination
11:49
S… Speaker 2 (2026-04-12 14-35-44)
machine on port 80 right here.
11:52
S… Speaker 2 (2026-04-12 14-35-44)
We see HTTP looks like a redirect right there.
11:56
S… Speaker 2 (2026-04-12 14-35-44)
We see that we're trying to get different files.
12:00
S… Speaker 2 (2026-04-12 14-35-44)
getting some icons.
12:02
S… Speaker 2 (2026-04-12 14-35-44)
We see the HTTP traffic,
12:05
S… Speaker 2 (2026-04-12 14-35-44)
but no other traffic is recorded,
12:08
S… Speaker 2 (2026-04-12 14-35-44)
and that's what the capture filter is meant to do.
12:13
S… Speaker 2 (2026-04-12 14-35-44)
So capturing information on or using Wireshark
12:17
S… Speaker 2 (2026-04-12 14-35-44)
is you know a fairly simple task
12:22
S… Speaker 2 (2026-04-12 14-35-44)
to perform.
12:24
S… Speaker 2 (2026-04-12 14-35-44)
There's not a whole lot to it.
12:26
S… Speaker 2 (2026-04-12 14-35-44)
You're either using a capture filter or you're not using a capture filter and
12:30
S… Speaker 2 (2026-04-12 14-35-44)
that's going to affect the information that is actually saved and displayed in
12:34
S… Speaker 2 (2026-04-12 14-35-44)
Wireshark.
12:35
S… Speaker 2 (2026-04-12 14-35-44)
separate from a display filter,
12:37
S… Speaker 2 (2026-04-12 14-35-44)
and you're making sure you have the correct interface selected.
12:41
S… Speaker 2 (2026-04-12 14-35-44)
Again, as we go forward with this course,
12:43
S… Speaker 2 (2026-04-12 14-35-44)
we're going to take a look at more features with Wireshark and other applications
12:48
S… Speaker 2 (2026-04-12 14-35-44)
as far as performing analysis with various different
12:53
S… Speaker 2 (2026-04-12 14-35-44)
types of traffic as well.

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