WEBVTT

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 Hello and welcome to this video titled,
 Configuring DHCP Clients.

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 In this video, I'm going to do a
 couple of demonstrations for you.

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 I'm going to show you how to verify
 your DHCP settings and change them

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 if you need to on two of the most popular
 clients right now, Windows for

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 Windows 10 client as
 well as from Mac OS.

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 So let's go ahead and
 take a look at that.

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 So let's start with Windows.

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 So I have a virtual machine
 here running Windows 10.

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 So number one, how would you confirm
 that your Windows device is currently

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 set up for DHCP, which it should be by
 default, but how do you check that?

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 Well, with Windows, there's always more
 than one way to accomplish your

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 objective. So one way is you can click
 on your start and then you can

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 click on the little gear shift here,
 which is equivalent to your control

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 panel. And then from here, you can
 go into network and Internet.

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 And then you can click on the whatever
 adapter that you believe you're

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 currently using either
 Wi-Fi or Ethernet.

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 So in my particular case, it
 would be my Ethernet adapter.

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 And then in order to confirm that it's
 currently running DHCP, you can

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 actually click on the network itself,
 where it says network here.

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 And down below under properties,
 right here.

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 So we can see it's
 got an IP address.

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 And clearly, if you did not configure
 that IP address, it did that via

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 DHCP. Another way that you can verify
 that's using DHCP is here under

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 just the search bar.

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 You can just type network.

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 And then click on network status.

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 Here we go again.

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 And this time, if we scroll down a little
 bit, view your network properties.

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 And this gives us a lot more detailed
 information under view your network

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 properties. So we can
 see DHCP server.

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 So DHCP is enabled.

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 Yes, we did hear from
 a DHCP server.

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 So all of this is confirming that
 we are indeed running DHCP.

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 It even shows how long your DHCP information
 is good for, the IP address

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 that you've learned, as well as a whole
 bunch of other useful information.

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 Now, if you don't see that, you say,
 hey, I don't think I'm doing DHCP.

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 How do I turn it on?

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 How do I get DHCP working?

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 All right, let's go back to
 the same thing we just did.

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 Let's click on start.

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 And then our control panel, or otherwise
 known as settings in Windows

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 10 settings. Go to where we were
 before, network and internet.

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 Click on the network adapter that you
 believe is connected to your network.

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 And this time we're going to click
 on change adapter options.

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 Change adapter options.

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 So here it is. Now you might actually
 see more than one adapter in yours

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 because this is a virtual machine.


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 I've only got one.

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 But you'll see, you know, you'll want
 to select the one that you want

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 to right click on the one that you believe
 is your network adapter that's

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 currently up and connected.

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 If you're not sure, just try
 to cross a variety of them.

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 But it's typically Ethernet.

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 It might be called LAN or LAN1.

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 And you'll click on properties.

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 All right, so with DHCP we're
 talking about IP version 4.

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 So right here it says Internet
 Protocol version 4.

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 You'll want to click that once, left
 click it just to select it, and then

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 click properties.

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 And right here. So notice this is what
 looks like when it's defaulted.

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 Obtain IP address automatically.

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 That means use DHCP.

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 And obtain DNS server
 address automatically.

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 That also means use DHCP.

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 You can click some of these other ones
 here and type in whatever you want.

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 If you want to give
 a static IP address.

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 But clearly if you're going to do that,
 you better make sure that A, you

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 know what network you're on.

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 You want to give yourself an IP address
 that's appropriate for the network

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 you're connected to.

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 And B, you want to make sure you give
 yourself an IP address that's not

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 already in use on that network.

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 Discovering that can be
 a little challenging.

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 That's why it's just better to obtain
 an IP address automatically.

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 So that's how you confirm and verify
 that DHCP is working on a Windows

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 based device. Just a couple of
 other things related to this.

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 Some other settings you can do.

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 So here within where it says type here
 to search, you can type in CMD,

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 which will give you
 the command prompt.

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 This gives you your old
 DOS command prompt.

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 And you can type IP config.

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 IP config gives you a real high level
 summary of your IP information.

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 Once again, if you're doing DHCP and
 you are connected to a network, you

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 should see something here.

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 You can see that you've got an IP address,
 subnet mask, and default gateway.

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 You can also do IP config forward slash
 all IP config forward slash all,

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 then hit enter, and you'll see
 much more detailed information.

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 Very similar to what we saw in the GUI
 about the IP address you've got,

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 your default server, and
 so on and so forth.

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 You could also type IP config slash
 release, and that will send out a

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 DHCP release message, telling the server,
 hey, I'm giving up this IP information.

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 I don't need it anymore.

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 Then of course you won't be on the network
 because you won't have an IP

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 address. After you release it, you
 could type IP config forward slash

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 renew, and that will restart the DHCP
 process all over again so you can

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 watch it in action.

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 So those are some useful
 tips there with Windows.

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 Now how do we accomplish some
 of that same stuff in a Mac?

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 This is minimize this.

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 So here I am working on
 a Mac at the moment.

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 So with a Mac, you go down and you
 click on your system preferences.

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 Once again, there's more than
 one way to accomplish this.

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 So with system preferences, you want
 to click on the network icon, and

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 right there, it defaults to showing
 you all your connections.

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 The one in green is the one that you're
 currently on right now, and it

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 says, using DHCP.

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 So that confirms that DHCP is
 on by default on this device.

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 It also shows you in the screenshot
 what your current IP address subnet

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 mask and router happens to be.

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 A couple of other options here.

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 You could change that to
 a manual IP address.

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 You could say use DHCP
 with manual IP address.

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 So that would be where if I did that,
 now it would give me the option

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 to type in my IP address, and then it
 would send out a DHCP inform message

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 saying, hey, I need other stuff.

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 I need a subnet mask.

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 I need a router.

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 I need a DNS server.

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 I don't want to do that though.

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 I just want to use DHCP.

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 And right now he's, so right behind
 the scenes there, he obtained DHCP

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 information. Some other ways that you
 can confirm this is you could go

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 to your terminal on your back, open up
 your terminal app, and within terminal,

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 one command you can
 type is ifconfig.

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 It stands for interface
 config, ifconfig.

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 It'll show you all
 your interfaces.

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 And for example, look for one that
 has an IP address, an inet address,

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 like right here.

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 So this shows that you
 obtain this via DHCP.

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 Now when you do ifconfig, there's
 a lot of stuff you don't see.

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 For example, we don't see in this output
 anywhere here, what's the IP

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 address of my default gateway?

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 What's the IP address of the DHCP server
 that gave me this information?

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 How long? What's the
 least time for this?

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 So if that's the information you want,
 then step number one is do ifconfig

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 like I did, and find the interface
 that has an inet address.

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 So just look through your
 various interfaces.

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 You might have a lot of them here.


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 Most of them probably have
 an inet six address.

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 That's your link local address.

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 It's going to be defaulting there.


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 But you want to scroll down through here
 and look for one or more interfaces

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 that have an inet address,
 an IPV4 address.

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 So my particular case, it looks like
 I've got VM net one, so that's for

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 a virtual machine.

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 VM net eight, that's for
 a virtual machine.

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 But my actual real ethernet card
 is ethernet 10 or EN 10.

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 All right, so I need to find that.


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 I need to find out what the
 name of the interface was.

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 Now that I have that, I can
 use a different utility.

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 I can say IP config.

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 Now in Windows, as we just saw, if
 I type IP config and I hit enter, I

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 saw something. Not
 so here in a Mac.

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 If I type IP config and I just hit enter,
 it says, hey, you need to give

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 me a command that goes along with
 that and possibly an argument.

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 So I'm going to show you one command
 and argument to get all that nitty

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 gritty stuff about DHCP.

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 You can say IP config.

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 Now the command is get packet and
 then you type in your interface.

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 See, this is why I had
 to do IF config first.

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 Without doing IF config, I would not
 have known which of my interfaces

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 actually had already gotten
 DHCP information.

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 So now that I have that, IP
 config get packet EN 10.

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 When I hit enter, now I can actually
 see the actual boot reply.

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 Once again, this was the
 same as my DHCP request.

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 And we can see all sorts
 of good stuff in here.

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 We can see your IP address.

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 So this is the one that I got.

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 We can see my Mac address.

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 We can see the actual IP address of the
 server, the DHCP server that gave

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 me this information, my subnet mask,
 IP address of my default gateway,

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 IP address of my DNS server.

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 All sorts of good information
 is in here.

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 Even my lease time.

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 A lease time is kind of hard to decode
 because that's a hexadecimal number.

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 But that is how you confirm in macOS if
 you're doing DHCP and how to modify

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 your DHCP settings.

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 So that concludes this video.

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 Thank you for watching.