Time
8 hours 53 minutes
Difficulty
Beginner
CEU/CPE
11

Video Transcription

00:00
after set up is complete. You will want to make sure that you are connected to the network and connected to the Internet
00:08
on the simplest way of checking. That is simply to open a Web browser and type in the address of a website and see if you can connect to it.
00:18
But what if that doesn't work? Well, the first thing to do is to check your I p configuration.
00:23
But let me just mention this before you start doing anything like checking the I p configuration.
00:29
Don't overlook the obvious
00:32
is everything, Actually, Plug did is the network cable plantain. Is the computer turned on? Is the display turned on? Is the home writer connected and turned on this? Well,
00:43
you'd be amazed how many times people forget to check the obvious.
00:48
And they just assume, you know, all of that's already in place.
00:52
Um,
00:53
another check you might want to run is this Is it just this new computer you're setting up that cannot connect to the Internet
01:00
or that there appear to be a general problem? Can other devices on your network connected the Internet? Because, obviously, if none of them can connect, it's not a problem with this particular computer that you're setting up. It's some other issue.
01:15
As far as checking your I P configuration goes, here's the bit of background to it.
01:21
In a T. C P I P Network. Every device must be assigned a unique I. P address
01:26
That unique identify WR is the same concept as there is with telephones.
01:33
Every telephone in the world has to have a unique telephone number.
01:37
That's how you identify it. So when you want to connect to a particular phone, you dial its number
01:42
on. That's pretty much how I p works in a. T. C p I p network.
01:49
Now the i p unique I p address of each device can be assigned manually,
01:55
in which case you need to go into the properties of your network adapter and then type in
02:00
the I P address and other information such as the sub Net mask, default, Gateway and so on.
02:06
But much more likely what is going on on most networks is that this assignment of I P address information is being done automatically.
02:14
So in a SoHo network
02:16
such as your home network or a small office network,
02:21
the assignment is done by your hope rocker.
02:23
Every time a device boots up and connects to the home writer, the home writer allocates to the device.
02:30
Valid I, p address subject basked afford Gateway and the N s sober address
02:36
in an enterprise network. They have dedicated servers known as D A TCP servers
02:42
that performed that assignment
02:44
in an enterprise network. You're dealing with hundreds, possibly thousands, of devices, and you need something a bit more powerful than a home router to be able to handle configuring all those devices.
02:55
But in any case, in a social network, it's likely to be, ah, home router that is acting as a D H C P server.
03:06
So what information is required?
03:07
So, as I mentioned earlier, every device has to have a unique I p address.
03:14
It also has to have something called a subject mask, and that's also a required setting.
03:19
Um, you will, if you continue to study, I t and start looking at networking.
03:24
You're going to spend a fair deal of time learning about what a sub that mask is.
03:30
But that is beyond the scope of this course.
03:35
In order to access the Internet, you need a few other bits of configuration.
03:39
Each device must be told the address of its default gateway.
03:44
The default gateway is just the router that connects you to the rest of the Net world
03:50
onto the Internet.
03:52
In a SoHo network, that would be the address of your home writer.
03:57
It is not always the case, but in many cases the address of your home writer is 1921681.1
04:03
or 1921680.1.
04:06
But it may be something different in any given network
04:11
in an enterprise network where they don't have home writers.
04:15
They have dedicated writer appliances.
04:17
So in that situation you would be putting in the I p address off that dedicated writer.
04:29
Another bit of information that's required by your client is the address of its D n a server.
04:33
Now, before we talk about that, let's talk about why we need the n s and what it is.
04:41
Everything. Every device on a. T. C. P I. P network has a unique I. P address
04:46
on these unique I P addresses are not very easy to remember.
04:49
For example, the I P address of Microsoft's Web site is 23. Doctor 18.40 dot 61
04:57
Now shut your eyes and recall that,
05:00
and I'll bet most of you couldn't remember it.
05:02
Now, if you have to connect the Microsoft website using its I P address, you would have to memorize that address on dhe. When you open your browser in the address bar, you would have to type in https colon slash, slash
05:15
and then the i P address, 23.218 dot 40.61
05:21
And probably even if you could memorize that,
05:26
what about all the other hundreds of websites that you might connect to? And the same is true of computers within your network.
05:32
In our office networks, for example, we connect to computers using their names. We don't remem arise their I P addresses.
05:43
Names are much easier to remember, So if you want to connect to Microsoft Website,
05:48
you can try typing in the I P address. But alternatively, you can type in its name,
05:55
and its name is just www dot Microsoft dot com.
05:59
And I'll bet you if I get you to shut your eyes now and recall the name off Microsoft website.
06:05
You're gonna find that a lot easier than trying to recall the i p address off Microsoft's Web site.
06:13
So the idea behind naming computers is it's much easier for humans to remember names.
06:18
Then it is to remember I p addresses. And this is true. Also, phone numbers. We often have trouble remembering people's phone numbers,
06:28
but we don't have trouble remembering their names, or at least not as much trouble.
06:32
So what do we do? We have some kind of telephone directory and in the telephone directory, will list everybody's name
06:40
and then will list their phone numbers.
06:42
So the N S. A service that runs on the network that does something similar. It's a database off computer names and matching I P addresses.
06:50
So when you type in something like www dot Microsoft dot com,
06:56
your computer sends a query to the D. N s service
07:00
to say, What's the I. P address that matches www dot Microsoft dot com
07:04
de NS then returns to the I P address, which in this case is 23 doctor 18.40 dot 61
07:13
And once your computer's obtained that i p address. It can now go ahead and connect to Microsoft's Web site
07:19
so that D n a service on a corporate network is provided by dedicated D N a service
07:27
in a social network. That service is provided by your home router.
07:33
So what happens if I pee? Configuration goes wrong
07:38
if your computer cannot get an I P address from the home writer,
07:42
Windows reacts to that by self generating an I. P address
07:46
that begins with 169.254 dot something about something
07:53
the X on the Y. The last two values in that address are chosen randomly.
07:58
If you ever see a computer has an address that begin with 169 dot to 54
08:03
Well, that tells you is assignment of I. P. Information has failed for some reason. For example, if you turned off your home router and then booted up your computer, it will end up with one of these addresses.
08:16
Thing, by the way, is called a peeper Automatic private I p addressing
08:24
what else could go wrong.
08:26
Apart from not having a valid I P address,
08:28
the client may not have the right address for the default gateway.
08:33
Remember, the default gateway is the router that connects you to the Internet
08:37
and normally in your social network. That is the device that is your home brighter.
08:43
So your client computer needs to know what is the I p address off the home router, which will then act as its default gateway.
08:52
Similarly, your client needs to know what is the I p address off its D. N s server
08:58
again in the coasts of eight Social network. It is your home reactor that is acting as the D. N s server.
09:05
So it's that address that has to be given to the client.
09:09
If all of three settings are not figured correctly,
09:15
you're going to have problems connecting to the Internet.
09:18
So you must have a valid I P address in sub that mask.
09:22
You must have a valid address for the address of the default gateway. And you must have a valid address for the address of the D. N s server
09:33
one tool that we can use to verify that we have the right configured information. It's a command line to called I P conflict.
09:41
If you have Linux systems, the similar command that does the same thing is I f conflict
09:48
and you can see here
09:50
that when I ran I p conflict on my computer,
09:54
I do have a valid I P address and a subnet mask.
09:58
I have a default gateway setting,
10:00
and I have the NS sober address
10:07
to verify Internet connectivity. You kind, of course, just open a browser and go to your favorite website. But also, if you right, click on the network icon and then choose open Network and Sharing Center.
10:18
This shows your connection and whether it's in place
10:22
here, for example, I can see that my computer is connected to the network and the network is connected to the Internet.
10:31
What this is indicating is I have a working connection all the way from my PC to the Internet.
10:37
If I was to click on the Internet icon, it would open up the Web browser and showed me a website.
10:45
But what if it's not working well,
10:48
I'm gonna disconnect the computer from the network
10:50
and show you how it all looks now.
10:54
Firstly, that network I called indicates, is a problem. There's a yellow icon, and it tells me there's no Internet access
11:01
Also, if we open up the network and sharing center,
11:05
here's what we see. The Red X indicates that the network is not connected to the Internet.
11:09
If I click on that X triggers Windows automatic diagnostics,
11:15
Windows Diagnostics attempts to figure out what the problem is, but often it cannot figure out what the problem is.
11:24
So let's go have a look to see if we can figure out time.
11:28
If you click on change network change adapter settings
11:35
and then right click on the network adapter and go to status and then click details,
11:41
we see what the problem is. There's that 1 69 to 54 address and you'll notice that the default gateway entries empty
11:50
and the D. N s server address and entry is empty as well.
11:56
So for whatever reason,
11:58
the raft era has failed to assign all that information to my computer.
12:03
Now, in this case, I know what the problem is. I disconnected the system from the network
12:09
in the real world. You would check, for example, that the network cables actually plugged into the computer.
12:15
Make sure that the Hope router is up and running.
12:18
Um, sometimes just rebooting your computer will fix the problem.

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