1 00:00:00,000 --> 00:00:17,640 Hey guys and welcome back. So the next thing that we have to understand for the purposes 2 00:00:17,640 --> 00:00:25,400 of the L-PIC 2 objectives is the general concept behind the Network Manager utility. Now quite 3 00:00:25,399 --> 00:00:32,320 honestly if you happen to be using a modern Linux based system chances are that the network 4 00:00:32,320 --> 00:00:39,159 configuration happens to be handled by this very utility Network Manager. So realistically we 5 00:00:39,159 --> 00:00:45,959 actually have a particular daemon and it is called well Network Manager all one word. Now what 6 00:00:45,959 --> 00:00:53,079 this daemon actually does it simplifies the process of network configuration. It allows things to be 7 00:00:53,079 --> 00:00:59,119 handled automatically but when you have to make a particular configuration change and that change 8 00:00:59,119 --> 00:01:05,280 may be related to maybe your Wi-Fi connection or your Ethernet connection you will be able to make 9 00:01:05,280 --> 00:01:12,519 this change like I say any simplified way without unnecessary complication. Now we can actually 10 00:01:12,519 --> 00:01:19,879 install a Network Manager. Let me show you how we just used to do it install network hyphen manager 11 00:01:19,879 --> 00:01:25,599 and we'll hit enter type in my password. There we go. I'll say yes. Now when we happen to have 12 00:01:25,599 --> 00:01:32,519 Network Manager installed we're going to have access to a particular tool called NMCLI the 13 00:01:32,519 --> 00:01:38,319 Network Manager command line interface and this is going to allow us to be able to easily inspect 14 00:01:38,319 --> 00:01:44,560 information relating to our networking devices as well as to make particular changes to those 15 00:01:44,600 --> 00:01:50,040 devices as well. So check this out. Let me show you some of the commands that we can use. We could 16 00:01:50,040 --> 00:01:58,760 say NMCLI and just say the word dev for device. If I hit enter we get this nice short truncated 17 00:01:58,760 --> 00:02:05,079 output relating to our networking interfaces. So we can see here on the left we see the device 18 00:02:05,079 --> 00:02:10,599 which in this case is my Ethernet interface. We can tell it is an Ethernet interface because the 19 00:02:10,639 --> 00:02:16,879 type tells us this right here. We know the state is connected and we actually have a connection 20 00:02:16,879 --> 00:02:23,879 name here wired connection one. We also can see that we have our L O device. This happens to be a 21 00:02:23,879 --> 00:02:30,919 look back interface and this is unmanaged. Now if we actually want to see more detailed information 22 00:02:30,919 --> 00:02:39,359 we could say NMCLI device show now if I hit enter we're getting a lot more information say for 23 00:02:39,360 --> 00:02:46,080 example here we have one block here this relates to my Ethernet connection and then the same type 24 00:02:46,080 --> 00:02:52,400 of information is available for the look back interface. So if we happen to look at this one 25 00:02:52,400 --> 00:02:57,000 here we can see the name of the interface. We can see the type. This is similar to what we just 26 00:02:57,000 --> 00:03:02,440 saw before but notice now we can also see the MAC address relating to this interface. We can see 27 00:03:02,439 --> 00:03:09,280 the MTU configuration. We can see the connection name as well as our IP address or actual gateway. 28 00:03:09,280 --> 00:03:15,319 We have our routing configuration such that we can see a default route i.e. if we do not have a 29 00:03:15,319 --> 00:03:24,039 particular route this will match all destinations and our next hop will be indeed 192.1680.1 30 00:03:24,039 --> 00:03:30,159 which happens to be our default gate. We simply put the root configuration is that for any routes 31 00:03:30,199 --> 00:03:36,680 we do not know what to do with just send it to the default gateway. We can also see we have DNS 32 00:03:36,680 --> 00:03:43,840 configuration here one server and below we have a second server as well as IPv6 information as well 33 00:03:43,840 --> 00:03:50,639 and if we look on down similar information is available for our look back interface. Now another 34 00:03:50,639 --> 00:03:56,960 command we can do is NMCLIcon. This is going to allow us to see our active Ethernet interface. We 35 00:03:56,960 --> 00:04:03,620 get the name but this also presents to us the UUID the universally unique identifier for this 36 00:04:03,620 --> 00:04:09,120 particular interface connection. Now the fact that we happen to see this name we can actually use 37 00:04:09,120 --> 00:04:16,280 this name and make changes to that particular interface. Say for example like I say we wanted 38 00:04:16,280 --> 00:04:22,000 to pull this interface down. What I could do is say sudo because we're going to make an actual 39 00:04:22,000 --> 00:04:29,120 change we need super user privileges I'll say NMCLI and then I will say con but as opposed to just 40 00:04:29,120 --> 00:04:35,959 hitting enter here instead what I'm going to do is I'm going to specify the command down to bring 41 00:04:35,959 --> 00:04:41,319 the particular interface down. Now what interface do I want to bring down? I want to bring down 42 00:04:41,319 --> 00:04:48,480 wired connection one which we can see right here. So within my inverted commas I will say wired 43 00:04:48,800 --> 00:04:55,200 connection one and if I hit enter what is going to happen is that this interface is going to drop 44 00:04:55,200 --> 00:05:02,840 and this is the interface to which I am connecting to over SSH. So now we can see here my SSH 45 00:05:02,840 --> 00:05:07,200 connection has been terminated. So what I'll do is I'll go to the actual machine open this up 46 00:05:07,200 --> 00:05:14,200 log in and I'll go directly to the terminal. So now what I'll do is I'll say sudo NMCLIcon up this 47 00:05:14,279 --> 00:05:21,120 time I'll type in the same name wired connection one and hit enter I'll have to type in my password 48 00:05:21,120 --> 00:05:26,560 of course there we go. Now we can see here on the right hand side the connection has been 49 00:05:26,560 --> 00:05:34,439 reestablished. So using the NMCLI tool will allow us to invoke network manager which can handle and 50 00:05:34,439 --> 00:05:40,879 simplify our network configurations. Now if we want to get hands-on and make manual changes we can go 51 00:05:41,000 --> 00:05:48,319 in using this tool and by using the NMCLI command we can easily display the status of our network 52 00:05:48,319 --> 00:05:54,199 interfaces or if we so choose we can make modifications quite easily using this tool via 53 00:05:54,199 --> 00:06:00,439 the command line and alter the state of our network connections. This may be our ethernet 54 00:06:00,439 --> 00:06:06,319 connection this may be be our Wi-Fi connection using the NMCLI tool we're going to be able to have 55 00:06:06,360 --> 00:06:12,519 full control over all of those type of connections. So really for the purposes of the LPIC2 examination 56 00:06:12,519 --> 00:06:18,199 we want to understand the existence of the network manager utility as well as its basic 57 00:06:18,199 --> 00:06:24,519 functionality and role in controlling or networking on our Linux devices. So I hope this has been 58 00:06:24,519 --> 00:06:27,000 informative for you and I'd like to thank you for viewing.