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NIC information. What is the NIC? NIC

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stands for network interface card. That

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is something that is attached to your

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computer, your desktop or your laptop.

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If you look at the back of your laptop,

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you will see the little port where you

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connect the the Ethernet 5 or 6,

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cat 5 or 6 cable to it. That's the

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card installed in your computer, and the

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port that is associated or attached

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to the card, that port is called NIC.

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In Linux or in computer world, it's

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called NIC. An example to find the

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information about the NIC is that you

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run a command ethtool, followed by the

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name of your NIC. And how do you find

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out the name of your NIC? Think it,

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think about how do you find out the

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information about your NIC, you run the

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command ifconfig, that will give you all

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the interfaces of your computer. If you

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run ifconfig you will see other NICs as

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well, what are those? Well, there is one

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of the NIC that you will see that shows

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up is lo. lo stands for loopback device

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is a special interface that your

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computer uses to commnicate within

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itself. It works as a diagnostic and

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troubleshooting and to connect servers

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running on the local machine. So it's

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like you could say a private

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communication within itself. Then you

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have another NIC that you probably will

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see in your machine, if it's a virtual

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machine, it's virb0. This stands for

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Virtual Bridge 0 interface, is used

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for NAT, NAT stands for network address

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translation. The virtual environment

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sometimes use it to connect to outside

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network. So I don't want you to really

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focus on virb0, or even lo because

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you will be seeing this but there is not

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not main function of this. The only

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function of the interface that is used

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to communicate to other computers is a

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different the third interface, which is

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usually labeled as if it's Oracle

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Virtual, it's enp, or if it's a regular

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server, you're probably gonna see eth

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0, 1, 2, or so on. So we will run this

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command ethtool in our environment, and

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see how we could get the information

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about our interface. So we'll go into

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our Linux machine. And this time, I want

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to log into my system using our console.

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So the console or you could use PuTTY

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session to if you want to. So let's see

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if I have a PuTTY session. I'll just

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execute the PuTTY session right here.

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But in order for me to run PuTTY

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session, I need the IP address. How do I

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find the IP address? How do we find it?

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ifconfig. Now you should be comfortable

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enough to run this command all the time.

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ifconfig, I'll put more because if it's

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if it doesn't fit on the screen, it will

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give me one page at a time. And

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the IP address that I have for my

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interface is this 192.168.1.12.

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[No audio]

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I log in as myself, and in order for me to

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run the ethtool command I have to be root.

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[No audio]

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So I am root. Let's clear the

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screen. Let's get rid of this one.

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Minimize it since we already have the

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PuTTY. Let's make a little bigger, and

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now we'll talk about the interfaces.

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Again how do we check our interfaces?

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ifconfig, as you can see, we have the main

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interface right here, which is the one

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that is used to communicate to other

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computers or outside world, and it has

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ip assigned. The next one is lo which I have

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already explained. And the third one is

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virbr0 already explained in my

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slide. I want to get information of vrbr0,

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so let's say ethtool and virbr0,

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and it will say, Link detected: no,

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so forget that. Then next one we want to

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do is ethtool lo. Link detected: yes,

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but there's not much information that's

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out there because it's the system's its

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own interface so we don't have to worry

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about that. The one that we have to be

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concerned with is ethtool enp0s3.

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Where do I get that?

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Right from here. See this interface,

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this is the name of my interface. So I

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will run ethtool, followed by the name

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of my interface, and I'll hit enter. Once

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I hit Enter, I have right here my

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command output start from right here.

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This is what it's telling me that

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setting for interface, it's supported ports

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is TP, Supported link modes, it

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supports 10, which is 10 mg, 100 mg,

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and 1000 mg, what is 1000 mg, it's

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one gig. So my interface supports one

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gig of traffic. Nowadays, if you're

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running your computer on a very high

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speed network computer, you will see 10

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gig right here. So a few things that you

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do have to get out of this command ethtool

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is one, whether it's

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link mode is 1000 or 10,00. Second, you have

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to know of course the Speed is 1000

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megabytes, which is the same as this

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one, then you need to know it's Duplex

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is a Full, Half duplex. These are the

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things you have to provide to your

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network administrator because when your

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computer is connected to a switch, and

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switch has to be configured for your

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port to allow the traffic to come in and

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leave your server, your system your

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network administrator will ask you for

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that information. So be ready for that,

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and remember the command to find that

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information is ethtool, and the last

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one is Link detected, that your

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interface link is up, it's active, it's not

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down. If you are troubleshooting it, you

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can find it. If you see no here then it

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means there's something wrong with your

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network card. Alright, try these

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commands, run man command on ethtool,

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and try with different options that is

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given and see what are the options that gives

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you the exact information that you are looking for.

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[No audio]