1 00:00:00,300 --> 00:00:06,300 Hi, everyone, in this picture, we are going to talk about Knecht, which is called as a network address 2 00:00:06,300 --> 00:00:07,080 translation. 3 00:00:07,650 --> 00:00:16,710 So network address translation is a protocol whereby internal private IP addresses are translated to 4 00:00:16,710 --> 00:00:19,680 an external public IP addresses. 5 00:00:20,100 --> 00:00:22,560 That simply means if you're having internal. 6 00:00:25,520 --> 00:00:31,670 Private address, then it will convert it into a public address, external public address. 7 00:00:31,730 --> 00:00:33,380 OK, is this clear? 8 00:00:34,580 --> 00:00:40,080 So as we all know, that IP addresses that can be routed to the Internet, to its destination. 9 00:00:40,740 --> 00:00:49,460 So remember that private IP addresses of the system inside the land cannot use their IP addresses on 10 00:00:49,460 --> 00:00:51,980 the Internet because they are not unique. 11 00:00:52,010 --> 00:00:58,940 So as we all know that every LAN uses basically the same IP addresses inside their network. 12 00:00:59,390 --> 00:01:01,770 So now let's understand, how does it work? 13 00:01:02,390 --> 00:01:09,220 So not a device except Star requests travels to the Internet from the international scene. 14 00:01:09,810 --> 00:01:17,570 So when any requests come from any device, what it will do, I suppose that this particular device 15 00:01:18,020 --> 00:01:20,380 is requesting something to Internet. 16 00:01:20,780 --> 00:01:26,210 So what it will do, it will send the request to this particular thing, which is router, and then 17 00:01:26,210 --> 00:01:28,640 it will send the request to the not. 18 00:01:29,600 --> 00:01:37,610 So what it is, it is having private IP address of getting to not not just containing one table and 19 00:01:37,610 --> 00:01:38,810 that particular table. 20 00:01:38,810 --> 00:01:46,970 What it will do, it will simply copy the this internal IP address, which is private, and convert 21 00:01:46,970 --> 00:01:50,330 this particular IP address to the external public IP address. 22 00:01:50,840 --> 00:01:57,890 After that, it will send the request to the Internet and after receiving the request, went to the 23 00:01:57,890 --> 00:01:58,520 destination. 24 00:01:58,520 --> 00:02:01,070 The destination packet will be released. 25 00:02:01,110 --> 00:02:04,530 We can say in response it will send some packet from there. 26 00:02:04,970 --> 00:02:11,210 So after receiving the packet inside the night device, what it will do, it will again go inside the 27 00:02:11,210 --> 00:02:11,480 table. 28 00:02:11,500 --> 00:02:19,970 It will check the particular IP address, which is external IP address is associated with internal IP 29 00:02:19,970 --> 00:02:20,460 address. 30 00:02:20,720 --> 00:02:28,300 So after that, it will convert that external IP address into the internal private IP address. 31 00:02:28,310 --> 00:02:29,960 And after that it will. 32 00:02:32,770 --> 00:02:38,770 Send the response to this particular form, so this is how basically it is working, so if you want 33 00:02:38,770 --> 00:02:39,530 to understand. 34 00:02:39,610 --> 00:02:40,740 So let me do it again. 35 00:02:40,840 --> 00:02:41,200 OK. 36 00:02:42,950 --> 00:02:44,240 Let me erase everything. 37 00:02:44,600 --> 00:02:50,180 Let me do it again so that it will be very easy to understand because the working of night is very. 38 00:02:52,380 --> 00:02:52,980 Interesting. 39 00:02:53,250 --> 00:02:59,820 OK, so as you can see that instantly in this particular diagram, we have two phones with private IP 40 00:02:59,820 --> 00:03:06,000 addresses behind a device that are serving as both a device and a router. 41 00:03:06,510 --> 00:03:11,120 OK, so these are the two phones, which, as you can see here, OK, is the split. 42 00:03:11,730 --> 00:03:18,870 So device users their private IP addresses within the LAN, but when they want to communicate over the 43 00:03:18,870 --> 00:03:22,300 Internet, when they want to communicate over the Internet. 44 00:03:22,500 --> 00:03:31,230 OK, so the device, as you can see that this is the device, so not device to translate it on the public 45 00:03:31,230 --> 00:03:33,750 IP address that are unique on the Internet. 46 00:03:33,870 --> 00:03:40,050 And in this way, the router along the way, we know exactly where to send the packet and we're not. 47 00:03:40,440 --> 00:03:46,220 So this is how it basically works if you want to understand the general understanding of this, generally 48 00:03:46,230 --> 00:03:47,310 how that works. 49 00:03:47,700 --> 00:03:49,740 So this was all about this particular diagram. 50 00:03:49,750 --> 00:04:00,810 So if you want to learn how basically network so the device accepts the request to traverse the Internet 51 00:04:00,810 --> 00:04:08,550 from an internal machine, then it simply records the machine's IP address in the table and convert 52 00:04:08,550 --> 00:04:12,360 the IP address to the external IP address of the router. 53 00:04:13,740 --> 00:04:21,900 So when the packet returns from its destination, the NAND device looks into its safe paywall for additional 54 00:04:22,350 --> 00:04:29,340 and forward on the packet to the internal IP address of the system that made the original request within 55 00:04:29,340 --> 00:04:29,730 the lab. 56 00:04:30,690 --> 00:04:37,970 So invoking properly the individual system and users don't even realize this translation is taking place, 57 00:04:37,980 --> 00:04:42,120 so this is very easy and very important to understand. 58 00:04:42,540 --> 00:04:45,060 So, guys, this is how NAC works.