In this lecture, we're going to study about how to check
your IP configuration on your PC or your laptop computer.
Now, we start with opening the command prompt window.
In a Windows 7 based computer,
you can click on the window button which is the button down there and all programs,
accessories, then go down to the command prompt - what you see right here.
And then you'll be able to open the command prompt window.
In a Windows 10 based computer,
you can click on the window button,
which is the button down there.
And then you can go through the options of all apps, Windows system,
then command prompt which,
you see, is right here.
Now, if your computer has a keyboard that is a Windows key included keyboard,
which is the one that you see right here.
Then, in Windows 7 or Windows 10,
by clicking on that Windows key and also the R button simultaneously,
it will automatically open up the Run box as you can see right here.
And, if you type in CMD,
which stands for command,
and then click on the OK button, then you will
get the command prompt window like this.
The next step is to type IPconfig into
your command window that you have right here and that's what I did over there.
Then, you will get a lot of information as shown in the red box down here.
You will get your IPv4 address,
IPv6 address, in addition,
your subnet mask, default gateway,
and more information as you can see down there.
You have some options to use.
And, among them, the slash all option is most powerful.
It gives you all information related to
your IP configuration that you're going to use on your network.
And you can see all the information down there.
In addition, here are some other options that are more advanced;
the release option to release
your PC's current IP information and obtain a new IP address from the DHCP server,
then, there's the renew option to renew your IP address.
You can, it can be used if your PC is set to
automatic IP address set up mode which uses DHCP.
The display DNS option,
which is to show your current DNS resolver cache logs.
Then, there's the flush DNS to flush or clear your current DNS resolver cache logs.
And, then, there's the register DNS to update the DNS settings on your PC.
Another powerful function is the ping command.
And, you use it in a way where you can test the roundtrip time from
the source PC which is your PC to a specified destination PC or a server.
Now, the target address that you can write in up there is,
actually, you can use the target destination's
IP address or you can use the domain name.
And here we're using the domain name of www.coursera.org.
And the information, as you see down here, will show up.
Also, ping has a variety of options.
The A option is used to resolve the host name of an IP address target.
The N option, it sets the number of ICMP echo request messages to send.
Now, without this option,
four requests will be set.
Then you have the L option which also includes,
you need to include the size information.
This is used to set the size of the echo request
packet from 32 octets to 65,527 octets.
Remember one octet is one byte.
Now, without this option a 32 octet echo request will be set.
Then, there's the I option and,
it is used to set the Time to Live value.
The Time to Live maximum value is 255.
There's the W option.
Now, this is used specifying a timeout value when executing the ping command.
It is just the amount of time in
milliseconds that ping waits for each reply.
Without this option, the default timeout value is 4000 milliseconds.
Then we have the P option.
It's used to paying a Hyper-V network virtualization provider address.
Now, another powerful tool that we have is the trace route.
And, this command is used as tracert and then you put the target address.
And, you can see that right there.
Now, it displays the route and measures
the transit delays from the source to the destination.
The target address can be an IP address or a domain name like
the domain name we're using right here, www.coursera.org.
Now, what happens?
Well, this is the type of information that you can obtain.
First, each row represents a hop along the route.
And the hop number shows the number of hops along the route.
Then the RTT shows the round trip time.
And the trace route checks the round trip time,
three times for each hop.
Then there's the name slash IP address and it's
the domain name or IP address for the router.
There is the option of H which
includes the MaxHops and it specifies
the maximum number of hops in search for the target.
There's also the W option with timeout to specify the time
to allow each reply before timeout in milliseconds.
These are the references that I use and I recommend them to you. Thank you.
Jong-Moon ChungProfessor, School of Electrical & Electronic Engineering
