WEBVTT 00:00.400 --> 00:06.430 As we learned in previous lecture, the IPP program is a multi-purpose network configuration tool that 00:06.430 --> 00:12.850 makes use of the full range of networking features available in a Linux kernel, and it replaces the 00:12.850 --> 00:17.760 earlier and now deprecated from the Ifconfig program. 00:17.830 --> 00:25.600 So with IPP here we can examine a system's network interfaces and a routing table. 00:25.600 --> 00:30.310 So in order to use that, for example, IPA here we will get this output here. 00:30.310 --> 00:37.450 So in this example we see that our test system has here has two network interfaces, right? 00:37.450 --> 00:41.710 The first called the L0, which is loopback interface. 00:41.710 --> 00:44.200 Oops, sorry, let's actually run it again. 00:45.220 --> 00:53.500 IP a and here the first called is loopback interface and visual interface that the system uses to talk 00:53.500 --> 00:54.220 to itself. 00:54.220 --> 01:00.220 And the second is Eth0 and this is called Ethernet interface. 01:00.220 --> 01:07.240 So when performing a casual network diagnostics, the important things to look for are the presence 01:07.240 --> 01:15.370 of the up in the first line for each interface and indicating that the network interface is enabled 01:15.370 --> 01:20.260 and the presence of a valid IP address in the init field here. 01:20.260 --> 01:24.460 As you can see in the init field on the third line. 01:24.460 --> 01:32.740 So for system using dynamic host configuration protocol DHCP, a valid IP address in this field will 01:32.740 --> 01:36.130 verify that the DHCP is working. 01:36.130 --> 01:44.020 And as you can see in this case our DHCP is working and here we also have the netstat command netstat 01:44.020 --> 01:44.620 here. 01:45.710 --> 01:48.410 So this is our netstat command. 01:48.530 --> 01:54.350 So the netstat program is used to examine a various network settings and statistics, and through the 01:54.350 --> 02:00.710 use of its of its many options, we can look at a variety of features in our network setup and using 02:00.710 --> 02:05.540 the netstat netstat e a options. 02:05.540 --> 02:13.080 We can examine the network interfaces in our system like the ifconfig and IP command. 02:13.100 --> 02:20.000 So here, using the R option, we will display the Kernel's network routing table and this shows how 02:20.000 --> 02:25.130 the network is configured to send packets from network to another network here. 02:25.130 --> 02:31.910 So in this simple example, we see a typical routing table for a client machine on a local area network 02:31.940 --> 02:38.150 behind a here our default and our local IP address. 02:38.150 --> 02:45.140 And here we have Jane Mask, Gateway and Interface zero Ethernet here and here. 02:45.940 --> 02:48.340 We can also transfer the files over network. 02:48.340 --> 02:48.790 Right? 02:48.790 --> 02:54.850 So what a good is a network is unless we can move files across it. 02:54.850 --> 02:55.260 Right. 02:55.270 --> 02:57.260 We need to move files from the network. 02:57.280 --> 03:03.220 There are many programs that move the data over networks, and we will cover two of them now and several 03:03.220 --> 03:04.900 more in later lectures. 03:04.900 --> 03:06.760 So the first is FTP. 03:06.940 --> 03:11.740 So one of the two classic programs is FTP. 03:12.280 --> 03:16.630 FTP gets its name from the protocol it uses is here. 03:16.810 --> 03:24.640 FTP means FTP means the file transfer protocol. 03:24.640 --> 03:31.480 So this FTP was once the most widely used method for downloading files over the internet and most, 03:32.050 --> 03:34.300 if not all web browsers support it. 03:34.300 --> 03:41.680 And you often use Uri's starting with the protocol FTP here ftp like this. 03:41.680 --> 03:43.260 This is ftp URL. 03:43.270 --> 03:50.720 So before we there are over web browsers, there was a FTP program and FTP used to communicate with 03:50.840 --> 03:58.580 FTP servers, machines that contain files that can be uploaded and downloaded over a network. 04:01.800 --> 04:07.410 So FTP in its original form, it's not secure because it sends account names and passwords in a clear 04:07.410 --> 04:12.960 text, and this means they are not encrypted and anyone sniffing the network can see them. 04:12.960 --> 04:20.070 Because of this, almost all FTP done over the internet is done by anonymous FTP servers and anonymous 04:20.190 --> 04:23.910 FTP server allows anyone to log in using the login name. 04:23.940 --> 04:26.610 Anonymous and mean and the meaningless password. 04:26.610 --> 04:30.420 So in this example here we will write this here. 04:30.480 --> 04:32.220 Actually let me write this like that. 04:37.850 --> 04:41.810 Clear and here ftp my file server. 04:41.930 --> 04:46.970 And as you can see here, we we need to connect to my file server here. 04:47.420 --> 04:52.160 And actually let's instead of we can also use the file server. 04:53.120 --> 04:55.570 You will connect to file server like this. 04:55.580 --> 04:56.810 File server. 04:58.050 --> 05:08.670 And here we will have the login name, the and actually the CD and make the commands will work like 05:08.670 --> 05:10.200 here just better. 05:10.200 --> 05:14.720 So here let's actually go to the get command widget command. 05:14.730 --> 05:21.570 So another popular command line program for file downloading is WJ Vjet. 05:21.570 --> 05:28.860 So it's useful for downloading content from both the web and FTP sites, Single files, multiple files 05:28.860 --> 05:31.560 and even entire sites can be downloaded. 05:31.560 --> 05:40.770 So to download the our Telekom, we will do vjet http s here oxley.com. 05:40.770 --> 05:49.230 And here we download the index dot HTML and let's actually see here, as you can see here, this is 05:49.230 --> 05:51.090 downloaded ox.com. 05:51.420 --> 05:54.780 Maybe we will miss some JavaScript files, but it's okay. 05:54.780 --> 05:59.500 We will see the plain text and the HTML files that we that every user see. 06:00.250 --> 06:02.800 If download with here. 06:02.800 --> 06:10.000 So as you can see, we are missing some Java files, but we are we are missing some JavaScript and CSS 06:10.000 --> 06:17.410 files, but we are seeing all of the contents that the normal user will see here, as you can see here. 06:19.140 --> 06:19.800 That's it. 06:20.660 --> 06:21.470 So. 06:22.350 --> 06:29.000 Uh, we we can also use the and also, I want to mention that the programs has many options to love. 06:29.010 --> 06:34.590 WJ To recursively download and download files in the background allowing you to log off but continue 06:34.590 --> 06:38.130 downloading and complete the download of partially downloaded file. 06:38.130 --> 06:45.510 And these features are well documented in a better than average man pics man page here widget here. 06:45.540 --> 06:45.900 Oops. 06:46.140 --> 06:53.100 Uh man widget and here as you can see new widget is a free utility for non-interactive download of files 06:53.100 --> 06:53.730 for on the web. 06:53.730 --> 06:59.790 It supports HTTP, https and FTP protocols as well as retrieval through the HTTP proxies. 06:59.790 --> 07:07.200 You can also read this widget in your own time and understand it better as actually widget is a pretty 07:07.200 --> 07:10.500 useful and popular tool in Linux ecosystem. 07:10.500 --> 07:12.060 So I'm waiting you in next lecture.