And this lecture.
I'd like to talk about Wi-Fi bands.
The band of a network defines what frequency it can use to broadcast the signal.
This means it also defines the frequency that the clients or the computers need to be able to support
and use in order to be able to connect to this network.
The two main frequencies used in Wi-Fi networks are two point four and five gigahertz.
Now previously when we use aero dump energy we were only sniffing on the two point four gigahertz frequency
you can see first of all my wireless adapter is in monitor mode mode zero in here.
So if I just do error dump Engine 1 0
you'll see that I can get the wireless networks around me.
But you might have noticed that you won't actually see all the networks around you when you're on air.
Dump energy I'm gonna control see this and if I go here to my normal host machine and it actually has
a built in wireless adapter so it's not as strong as my alpha adapter but if I look for networks you'll
see I actually have much more networks in here.
And mainly I have networks and in here and the name by 5G.
Now the network doesn't have to necessarily end in 5G but here in Ireland if a network broadcasts over
five gigahertz the service provider adds 5G to the network name.
But we also have other networks broadcast in over 5G that don't end in 5G but basically the main point
that I want to talk about is I am not able to see all the networks around me in here and aero dump energy.
And the reason for this is because aero dump energy is only sniffing on two point four gigahertz frequency.
So if you do this and you don't see all the networks around you or if you're sniffing on your own network
what you don't see all the clients in your network.
It's possible that you're out there is broadcast in over two bands over two point four and five gigahertz.
And if you're not seeing the router at all if you're not seeing the network at all it's like what's
happening here for me then the router is probably just broadcasting over five gigahertz.
Now this doesn't mean that your wireless adapter is not good.
It just literally means that this adapter is not able to see five gigahertz frequency.
It's just outside of its limit outside of its reach.
The main problem with five gigahertz is that there are a lot of wireless adapters that can see it and
can communicate with it but not many of them support monitor mode and packet injection.
So you might see me and other people recommending wireless adapters like Alpha a W us the 0 3 6 and
h a.
This is my most favorite wireless adapter.
I use it all the time even now.
But the problem with that adapter is it doesn't pick up five gigahertz frequency so it doesn't mean
that that adapter is bad.
It just means that it can't see five gigahertz frequency like I said there aren't many wireless adapters
that support why 5 gigahertz.
But I have an adapter here.
It's Alpha a WUSA 0 3 6 AC Hage and this adapter supports both 2.5 gigahertz and 5 gigahertz frequencies.
It's not as good as the alpha but it does the job.
Now if you want more information about wireless adapters check out the link in the resources.
I'm not going to talk a lot about what wireless adapters do but in this lecture I want to show you how
to sniff and discover a 5 gigahertz frequency networks and then so that you can use all the attacks
that you've learned in my other lecture and in my previous videos with five gigahertz networks.
So the adapter that I'm using right now supports five gigahertz but as you can see I still can't pick
up these networks does because I need to specifically tell aero dump energy that I want you to listen
on five gigahertz frequencies and five gigahertz channels to do that.
All we have to do is just to error dump energy like we always do and then we're going to use a new argument
that we haven't seen before.
And this argument is called band and we're going to tell it that I want you to sniff on band a.
And that's the band that supports five gigahertz frequency.
And then I'm just gonna give it my wire the name of my wireless adapter and monitor mode which is mode
zero
so the command is very simple it's very similar to what we've used before and all we have to do is just
type an error dump energy followed by the band and the band that we want to use is a.
And we're following that with our wireless interface so I'm going to hit enter
and as you can see as soon as we have this I'm actually just going to do control C now cause you can
see the results you can see that we got much more networks right now and we have the five gigahertz
network.
So we have this network and this network that we weren't able to see.
We have the Jameson whiskey network as well.
And basically we're able to capture all the networks that use the five gigahertz frequency.
Now what you can also do.
Let me clear the screen.
You can specify multiple bands using the band argument.
So again using the same command instead of just saying band a we can do band a b g.
And what this will do is it'll tell or dump energy to capture data on both two point four and five gigahertz
frequencies at the same time so let me show you.
So as you can see right here recapturing some two point four gigahertz networks and were capture in
five gigahertz networks as well at the same time.
And we'll also be able to discover clients connecting to both bands.
The only problem with using aero dump like this is first of all you need a powerful wireless adapter
to do this.
Also it'll be slightly slower than on this anything on one band because when you're sniffing on two
bands you have a lot of channels that era dump energy has to hop on all of them and discover clients
and networks broadcast broadcasting on these channels so if you want quicker results then you're better
off just specifying the band a when you want to sniff on 5 gigahertz frequencies and just not specify
the band when sniffing on two point four.
But as you can see you can just run the command like so with band a G and this way you'll be able to
capture data sent over two point four and five gigahertz frequencies.
Also keep in mind in order to sniff data on five gigahertz frequency like I said your wireless adapter
needs to be able to support this band.
So simply adding the band argument will not work unless your wireless adapter can support and can sniff
data on this band.
One more thing that I want to note I've actually said this before.
If you run aero dump energy against a network and you see some devices miss and then there is a high
chance that these devices are connected over five gigahertz.
So again use the band a as then you should be able to see these devices.