WEBVTT 00:08.660 --> 00:14.510 Hello Friends will come back in this list and we're going to talk about local DNS server. 00:14.590 --> 00:21.370 So what is DNS server DNS server is responsible for resolving and domain name and IP address. 00:21.750 --> 00:29.800 OK so when would we type in the domain name in the browser then the DNS server finds the corresponding 00:29.800 --> 00:31.560 IP address of the Web site. 00:31.680 --> 00:32.110 OK. 00:32.260 --> 00:38.070 And I find that web site for us and the users and the access to that Web site. 00:38.250 --> 00:38.850 OK. 00:39.220 --> 00:45.410 So the NSA was responsible for finding the IP addresses of the domain names. 00:45.470 --> 00:45.790 OK. 00:45.820 --> 00:48.230 That we type into the browser. 00:48.400 --> 00:48.950 OK. 00:49.030 --> 00:55.450 So in this lesson we're going to talk about hope to get the information about the DNS servers in case 00:55.450 --> 00:59.020 there is a problem on our system of order DNS server. 00:59.020 --> 01:01.410 Then we can easily resolve that. 01:01.780 --> 01:03.270 So there are few tools. 01:03.290 --> 01:10.440 OK which can be used to get information about the DNS service so that it practically could do this. 01:10.870 --> 01:15.280 OK come on that I would like to show you business lookup then look up. 01:15.290 --> 01:16.310 Come on. 01:16.720 --> 01:20.580 Is used to find the information about the DNS server. 01:20.720 --> 01:21.370 OK. 01:21.880 --> 01:27.420 So there are two more so it can start DNS look up the Vinnies non-direct two more. 01:27.420 --> 01:29.440 And the other is interacting more. 01:29.440 --> 01:34.390 So first of all I would like to show you how to use the come on with non-interactive more. 01:34.560 --> 01:35.060 OK. 01:35.200 --> 01:38.170 So the non indirect do more is like this. 01:38.170 --> 01:43.240 First you need to tap the command and after that you need to type the domain name. 01:43.450 --> 01:51.640 OK so I want to get the information about you want to dot com and Agentur OK. 01:51.770 --> 01:57.740 After hitting the come on like this here you can see we get the information about the IP address of 01:57.740 --> 02:00.820 Ubuntu to dot com and the local DNS service. 02:00.890 --> 02:02.760 OK on this Linux machine. 02:02.830 --> 02:11.300 Ok that is going to $7.00 53 getting spare you can get the basic information in this form. 02:11.480 --> 02:11.900 OK. 02:12.080 --> 02:19.940 If you want to read different records about any domain then you can do like this Suppose you want to. 02:19.940 --> 02:25.300 Q. Re and ex-Director and remixer of course is a mail exchange record. 02:25.460 --> 02:30.560 OK which is responsible for whenever some mail send one to the can. 02:30.570 --> 02:36.060 Then it confirms that that mail actually sent to that domain. 02:36.250 --> 02:36.760 OK. 02:37.100 --> 02:46.880 So you read that in Q3 Google Maps and this will find the exchange rate call for one to dot com. 02:47.000 --> 02:52.640 So here you can see it is not authorized to Onsen for one credit card. 02:52.940 --> 02:54.580 And in the record. 02:54.680 --> 02:57.200 Then again you scan on a credit card. 02:57.230 --> 03:00.800 It is a record for this domain. 03:01.490 --> 03:04.540 You can also search for any records. 03:04.550 --> 03:07.700 So what is DNS record in this record is name service. 03:07.970 --> 03:10.710 Or you can call the DNS service. 03:10.720 --> 03:19.580 So find the names or records for google.com just replace a mix in this and hit enter. 03:19.960 --> 03:24.860 And here you can see you get the names server records for one to dot com. 03:25.000 --> 03:30.640 So there are four names there was and this one is for history and this too. 03:30.870 --> 03:31.450 OK. 03:31.570 --> 03:35.900 These are the names or words which are reserved for Ubuntu to on. 03:36.160 --> 03:40.350 You can so it is a start up authority for quotes. 03:40.460 --> 03:41.710 We just replaced that. 03:41.770 --> 03:46.120 This Okay and hit enter. 03:46.570 --> 03:47.020 OK. 03:47.120 --> 03:50.570 So you will get the recourse like this. 03:50.680 --> 03:50.920 OK. 03:50.920 --> 03:57.310 That is it gives the origin and this one canonically dot com then milah address post-master dot canonically 03:57.310 --> 04:02.970 dot com then serial number of that domain refresh retry expired and minimum. 04:03.040 --> 04:10.120 OK this information you will get with this very close if you want to see all the recalls so of this 04:10.120 --> 04:13.690 you want to dot com then you can do here like this. 04:13.690 --> 04:17.690 Just type in and hit enter. 04:17.940 --> 04:22.410 And here you can see it will use you all the information about that domain. 04:22.520 --> 04:22.860 OK. 04:22.860 --> 04:25.210 It contains all these records. 04:25.410 --> 04:26.130 OK. 04:26.160 --> 04:33.520 So in this way you can read information about a DNS server with the help of descendants look up. 04:33.660 --> 04:37.240 There is a technique called a reverse DNS lookup. 04:37.530 --> 04:42.700 So to perform reverse DNS lookup what you need to do is you need to port an IP address. 04:42.750 --> 04:48.820 So here you can see the IP address of this will want to dot com is 9 1. 04:48.920 --> 04:56.620 Got 1 9 9 4 4 0 unique IP address. 04:56.650 --> 05:00.540 OK instead of domain name and hit enter. 05:00.680 --> 05:06.980 Now here you can see it will give you this information after performing the was DNS look up and get 05:07.020 --> 05:12.500 in this way you can perform all these operations with the help of NSA look up come on. 05:12.500 --> 05:20.670 So after performing this I want to show you in our Are the thing that you can perform a port based operations. 05:20.780 --> 05:21.190 OK. 05:21.290 --> 05:26.360 Suppose you want to perform on port number 34. 05:26.510 --> 05:34.930 So what you need to do is work and then you specify the port and Roy the domain name. 05:35.480 --> 05:44.820 You can performant port specific during formation operation here like this really good because that 05:45.100 --> 05:52.990 does not actually sit there the by default port is 53 when you are performing any lookup operation. 05:53.280 --> 05:56.520 And that is why it's not doing any proper answer. 05:56.760 --> 05:57.230 OK. 05:57.230 --> 06:02.530 Just FYI you can perform all these operation in non-intersecting more. 06:02.880 --> 06:06.180 So now let me show you how to perform these operations with. 06:06.210 --> 06:07.940 Interact do more. 06:08.010 --> 06:12.560 So get inside like two more and just hit enter. 06:12.900 --> 06:15.780 OK now we are inside the interactive mall. 06:15.810 --> 06:20.220 So suppose I want to search for a MX record. 06:20.400 --> 06:25.320 So type here said Max now after this. 06:25.430 --> 06:37.030 I don't mean suppose I want to do this for event but OK now this used information about them it's a. 06:37.440 --> 06:41.690 And you can perform this operation all for multiple domains. 06:41.690 --> 06:46.090 This is the difference in between are not in direct doing and direct to more. 06:46.310 --> 06:56.350 So suppose I want do it for code of line of code which is my domain on my website just to enter and 06:56.350 --> 07:03.990 this will use this information so what you want to call form and this information source that I will 07:04.270 --> 07:11.770 ruinous and Guri who want to also strive for Google dot com 07:15.040 --> 07:22.870 and this will use this information about in service of Google or dot com only in this way you can perform 07:23.530 --> 07:25.990 all these operations in indirect do more. 07:26.030 --> 07:34.190 And if you want to see all the records then just take it out equal any and then domain name 07:39.040 --> 07:41.490 in this very group or from the operations. 07:41.530 --> 07:53.500 In fact two more if you want to quit type exit here this is the way by which you can get information 07:53.500 --> 08:01.960 about your name servers or MX records and by getting that info you can actually get the point that exactly 08:01.960 --> 08:02.900 where the problem. 08:03.010 --> 08:07.120 OK suppose your domain is not working properly. 08:07.170 --> 08:12.400 If it goes off line or wait for any problem you can search for this information whether it is properly 08:12.400 --> 08:14.010 configured or not. 08:14.160 --> 08:19.380 Good by knowing this you will debug the problems about the DNS. 08:19.570 --> 08:22.180 OK so the next come on which is the smooth. 08:22.170 --> 08:23.640 Come on Blake. 08:23.740 --> 08:24.170 Look up. 08:24.250 --> 08:30.810 Let me show you are the companies they've come on you can perform the same operations on any domain. 08:30.880 --> 08:40.710 So suppose I want to perform one on and this use this information to not look like the IP address of 08:40.720 --> 08:48.030 Ubuntu and other information that Guri time server address means the local DNS server address. 08:48.420 --> 08:49.920 And this sunset is very long. 08:49.920 --> 08:53.750 You don't need this kind of ugly output. 08:53.850 --> 09:01.650 So if you want a short answer you just need to type and shot and hit enter and then you will find this 09:01.830 --> 09:04.530 answer in this short form. 09:04.810 --> 09:10.610 Ok suppose you want to find the MX record and then just type here Max. 09:10.770 --> 09:12.860 Enter. 09:13.110 --> 09:15.870 And this would use this short answer. 09:16.040 --> 09:22.230 If you remove this you will get this long are the answer. 09:22.430 --> 09:23.350 OK. 09:24.230 --> 09:33.680 If you want to search for this right or just Despite this short and this gives you the names or information 09:33.680 --> 09:44.370 about when to go you can also perform for different records like it's all and for all records. 09:44.400 --> 09:54.610 Just like any this would use all the information you can also perform and he was the D.A. look at this. 09:54.610 --> 10:10.300 So what that described IP address 9 1 9 1 door 1 9 8 9 4 4 4 0 He's not giving any answer. 10:10.300 --> 10:13.510 Just type the AGI like this. 10:13.750 --> 10:18.980 You'll get an answer in this way you can perform all these operations here. 10:19.220 --> 10:25.070 But it did come on the command line it came the fore multiple domain names that one. 10:25.270 --> 10:35.620 So suppose I want to get a phone call off line call for this record then shut and for one I want to 10:35.650 --> 10:38.830 perform a MX record. 10:39.130 --> 10:42.570 Or you can do it in small shot. 10:42.610 --> 10:44.600 Let's see what happens. 10:44.680 --> 10:52.640 There is a spelling mistake for hope to one to call it in this way. 10:53.030 --> 11:00.090 You will get the information about the multiple domains with this technique and this way that command 11:00.110 --> 11:06.540 can be used and there is another command which is used to perform the same operations the command is 11:06.560 --> 11:08.320 horse meat horse. 11:08.350 --> 11:15.320 You get the same information like a book of like sort of like dog gone. 11:15.710 --> 11:16.230 OK. 11:16.490 --> 11:23.180 Like this here you display the IP address of call up line dot com and if you want to see a particular 11:23.570 --> 11:28.170 call like go en masse in this and then just type here the. 11:28.340 --> 11:30.330 And then Amex. 11:30.350 --> 11:39.200 Force suppose I want to do it for Google then Google dot com like this you will get the info for a particular 11:39.200 --> 11:48.760 record and if you want to see all the records and then just type hi for me and enter OK you need to 11:48.760 --> 11:54.300 remove these hammocks and OK in this way. 11:54.400 --> 11:58.920 This will give us all the information regarding Google dot com domain. 11:59.050 --> 12:08.000 Ok to news there Eric or the A Eyrecourt in Mexico in hysterical cédric or DXi soy. 12:08.230 --> 12:16.630 All these records can be found here about Google dot com in this way you can cue the DNS filtered information 12:16.660 --> 12:18.110 with the properties come on. 12:18.210 --> 12:24.880 OK on your Linux system and if you have any problem about your domain or anything like that you will 12:24.880 --> 12:27.630 resolve that by getting this information. 12:27.870 --> 12:28.350 OK.