How Network Address Translation Works

Explanation of what Network Address Translation is, how it works and why we need it to keep the internet growing. IP version 4 and 6 are also discussed.

[@varunsaproo4120]

8 years later, this video is still perfect

[@lukasaudir8]

Man that's sad that this guy stopped working on this channel all his videos are great and super simple to understand, he has a gift 👍 Thank you Pieter!

[@kennethhowell5291]

Thank you! After 10 years of trying to understand nat, you have explained it clearly in 2 seconds. Thank you!

[@CSEPracticals]

but where does that port no came from ?

[@hieunt0204]

It's provided randomly by your router and pc

[@TheIminator25]

10 min*

[@FingerThatO]

@@hieunt0204 do the ports change or are they static per device?

[@nikhilpatil5615]

No some ports are reserved for particular use but u can specify particular port for your use

[@bsummer]

I came back here because of aws natgateway . Your vid always clears doubts. Thanks for this.. Appreciate

[@AP-eh6gr]

at 1.25x, your video is perfect

[@PristinePerceptions]

+ashish paralkar I agree! It's almost feels like he recorded at 1.25x and then slowed it down :D

[@boydseabiscuit2635]

rap!

[@zebbleganubi723]

0.5 is funnier. it sounds like he has brain damage

[@Niko-zl5hn]

ashish paralkar lmao

[@itsmemarva1763]

I watched it at 2x...

[@БориславБорисов-я2ы]

So clearly! As said Einstein: “If you can't explain it to a six year old, you don't understand it yourself.” Thank you!

[@bammoore8593]

Finally someone knows how to keep it simple!

[@michaelstyler1606]

Pieter, you have a gift for teaching. Please consider making more videos. I've been learning CompTIA Network+ Objectives for the exam and am brand new to networking, and your teaching style and presentation is perfect. The visuals are super high quality and helpful. Thanks for doing what you do. Your materials are some of the best on the internet.... but you need more videos! Lol

[@hiteshgarg649]

Hi ! your videos are awesome. but why are you not making more videos related to computer networking? please upload more videos. these videos are very interesting.

[@tusharjajodia9077]

Hitesh Garg good though

[@DiaborMagics]

This video is pure GOLD! Thank you so much! You explained this about 4.2 billion times more clearly than my professor!

[@kidtury]

Really straightforward and easy to understand. One of the best tech explanation videos out there. We need more.

[@Exodiq]

watched like 50 videos that explain the internet and that was the only one that really helped . Thanks alot!

[@Benjamin-bf8fo]

Your videos are life savers! I'm in the middle of studying for my exam on networking and the officiall university slides use so much technobabble that it's hard to grasp the underlying concepts. Also these videos are exceptionally well structured and your voice is very clear. Thanks a lot for doing this!

[@4949smiley]

I came through NAT but I never was able to understand the clear picture of WHAT and HOW it works. You explained bit by bit. Simple and easy. Thanks :)

[@LynFantast]

I was disappointed to click on your channel and see that you had no more videos. This one was of great help, I hope you make more!

[@irfan_antennas]

Your video did my assignment of Avionics Engineering in 2020 . Thanks keep rising and shining.

[@seetsamolapo5600]

Please make more videos. This was hands down the best explanation for NAT Don't mind me just making myself some notes here: -There are more people available who even use more devices than there are IPv4 addresses -Local machines in a local network are all connected to a router, which is in turn connected to the internet - external public networks - To reach a public server, the packet from a local private IP has to go through the home/local router. Then through the internet - multiple routes. Then finally the webserver. - The home router changes the packet private IP source address into its own public IP address - The home router also creates a NAT forwarding table which helps with return packets to know which packets go to which host in the local network by mapping host's private addresses to reserved public addresses in it - The web server creates a response packet with it's destination as a the home router which is a public IP - At the home router the packet's destination IP address is changed to the corresponding/matching local private IP address on the NAT forwarding table. Then the packet will be forwarded to the local host

[@alecdoazan2771]

This is the best video series on the web for understanding internet networking. I personally suck at it, and now I feel like I could explain all of it to other! Brilliant!

[@sayandiproychowdhury7767]

i havent seen any better explanation before...pls pls pls make more videos on networking... network is fun

[@luisalduucin]

Amazing ... you only can explain something when you understand it. This video proves that you understand it very well . Thanks

[@mohamad.baalbaki]

Man you just made me understand what the hell is the difference between public and private ips, thanks!

[@Spaniards56]

Thanks a lot for your explanation! Please do not stop sharing your knowledge. This is needed by people who, like me, are trying to learn these concepts.

[@jasonscalzo9597]

I've been having trouble understanding NAT and your video is what did it for me, thanks a lot! I had trouble realizing that private IP addresses can be reused on different networks, something I kind of already knew, and understanding how the router knows which device to send the packets to. You explained it wonderfully

[@rafikhandoker9802]

even in 2019 this is helpful

[@reactorscience]

only 6 video on the channel and 54k subscribers, that kind of tells you the quality of the content. It is super amazing.

[@adrielomalley]

Watched a BBC documentary "The Joy of Data" from 2016. It explained things amazingly.

[@LakshmipathiG]

Honestly, this channel deserve at-least half-a million (not 40k) subscribers. Thank you for your time and effort.

[@exotool]

This video is just missing "Hi, everybody!".

[@PieterExplainsTech]

Just wait until you hear me imitate Dr. Nick on purpose.

[@kk-transport]

+exotool yeah

[@johnconnor9787]

This video is the best. Guys, you make the content of a very high quality. Your way of explanation is brilliant. But it seems like you stopped making videos and that is a sad story. Thank you! Please continue making your videos, we need this)))

[@nblandfriends]

Great video! Stumbled across this while I was researching CIDR block addressing.

[@prafullavishwakarma2256]

What would I do without you Pieter. So amazingly explained , I was gonna leave this topic for my exam . Thanks to you :)

[@samantkumar7200]

thanks a lot sir , i have my computer network exams tomorrow and i gained a lot of knowledge by watching few videos , keep up the good work ...

[@alihassan2203]

how much marks you got?

[@nightwingx6]

You make fantastic videos that are clear, make sense visually, and hold true to the theory. THANK YOU!!!

[@ananyalittlesharma5426]

4 i 2 to

[@jishadpeevees9510]

I was looking for such a simple video to understand NAT and its use.

[@maryjohn3397]

I have taken a full course in networking in India and haven't get to know how NAT works.But this video helped me to understand this concept.Great video.Keep this up Pieter.

[@RaghunandanChakravarthy]

The concepts have been articulated very eloquently. Please make more videos like this and share your knowledge with us.

[@jtigsi]

Thank you so much. NAT was confusing at first and explained it in simple terms in this video. Helped a lot for writing about NAT and how it is used.

[@leojacquemin2037]

Seen half a vid only and already subscribed. Speaks for itself.

[@SaadJameelAlrawi]

Man, the way you speak is amazing. Thank you very much.

[@mrkaa001]

Thank you very much!! I wonder why some lecturers cant explain as clearly as you.

[@debanandasagarsahu7647]

Hey I am a CCNA certified. I just felt like checking out some videos. And yes I found the best.

[@vivekshivhare8820]

I just love the way you teach, clear and crisp, thank you so much.

[@emonmahbub969]

it is October of 2020, after 8 years of uploading this video I have to say it was a great job

[@ashish2614]

PLEASE, MAKE MORE VIDEOS ON THESE KIND OF TOPIC. IT'S VERY EASY TO UNDERSTAND AFTER WATCHING YOUR VIDEOS.

[@PieterExplainsTech]

Thanks! As far as the subtitles are concerned, they're generated automatically by KZbin and their accuracy varies.

[@arontigerful]

You make NAT so simple to understand, thank you! I was always have a question inside my head what is the function of NAT, after I see this video it become so clear to me what is the importance of NAT. I expect more video about networking from you

[@password7157]

Well, this video dumbs the complexity of the basic functions of personal/public ip addresses down enough that along with the simple animations it can be understood by anyone who has any idea what an ip address is. Thank you for the videos, haters are going to hate no matter what, so keep up the good work

[@realtebo]

Absolutely best video on NAT for entry-level as me

[@johnconnor9787]

The one who explains this material, the one who created this video presentation is a genious))) I watched tones of videos, read a lot of materials related to this topic, but nobody could explain it so clearly. You have a talent)) Please, start making new videos again. See, you have just 5 or 6 videos, but you have 54K subscribers. I believe that you are able to reach million in a short period. Thank you very much. You are the best

[@priyankananwani8595]

Your illustrations are excellent. :) Please create more such videos especially around networking, how internet works, the different types of protocols - their history, advantages and disadvantages, and so on, thanks.

[@elegantuser1090]

It's to the point that i was looking for. Literally, I was hungry, you helped me to grab more than what I consume usually, lol. Thank you.

[@MrCatatete]

Finally i found there is a NAT table ! I have known it is a association between public and privat ip but i didn't know how exactly. TY

[@nealdavidson3715]

Man I been looking for a clear cut explanation. Thank you !

[@oweibor]

best NAT Network and IPv4/v6 Explanation ever! Love you man!

[@raymartin1687]

NAT address translation very well explained! Thank you. I went to several other sites but none handled it as well. The animation was key as was the illustration of the IP addresses and the specific port numbers

[@sreenathsomarajapuram346]

The best explanation of NAT on KZbin.

[@mathimagery]

The video was awesome. You correct this- there are three reserved ranges of IPs not two, and these are: 1) 10.x.x.x.x 2) 192.168.x.x 3) 172.16.x.x

[@mohammadhaque6404]

Awesome: Hope you are doing great!! Come back man. We guys are waiting for you. You have the capability to make the things very easy.

[@SamoZain]

you are amazing. I've never understood how it's worked until I saw that video. thanks man

[@motoojatt4153]

Explains perfectly the purpose having a NAT table! Thanks.

[@dimasdark]

Omg the best teaching lessons I've ever got! You explain the concepts like magic, and I've already have classes with 3 network professors, and they were not as clear as you. I hope you make more videos =(

[@logancarvalho]

I am so impressed about the quality of your videos that I want to cry. Congratulations, this work is wonderful, your explanation is excellent and your english is perfect.

[@babisuper85]

Pieter, thank you.This helps me a lot. I'm entering new position and required me know the high level of IP Network. Your video is just amazingly easy to understand. Keep posting please.

[@525RSRPmovies]

Would like to see more videos published by you on networking. Very helpful. Thank you.

[@abelami1]

with this video i understand that life is easy than we think. Think you

[@Gooseycoyne]

Absolutely brilliant video. So easy to understand. Made me understand NAT very clearly. Thank you

[@OfficiallyOrca]

I would like to see ur explanation of Subnetting. Everything else you touch is golden I'm completely new to this field switching careers and ur videos is pretty good

[@grishamcrime]

Great presentation and analogy. Straight to the point and well explained. I like it.

[@aler13CR]

This is a great video explanation about NAT!

[@kalleidoskop2]

Brilliant! I was sincerely wondering how these things work a while back when I set up a server. Now I know, thanks!

[@ana-mariacotilici4158]

Your channel is amazing, you make these things very easy to understand, thank you!

[@عبيرالدهيمي]

This so helpful especially for students.. Please don't stop making videos please 😢

[@akshitadoad765]

how could some one be so awesome..i mean... thanks a lot sir...you really made a messy thing so simple!!

[@vikashegde715]

very nice explanation. simple to consume. this is how networking classes should be.... more of such videos neccessary

[@dvishwanath6996]

Thank you so much. This video is better way to understand concept of NAT.

[@sagarraut9455]

Video has cleared the concept of NAT. i have seen your other videos too... it's really simple to understand

[@EscapeePrisoner]

Oh, praise be to Pieter. Thank you so much for explaining that in such a nice way. I'm sure there's more complexity to it but at least I can understand it at a fundamental level now. Subscribed.

[@boogabooga223]

one of the best videos ive seen on youtube. so well explained.

[@planetlumi4138]

Best voice in all of video explanations and so much less jargon.

[@shyamsundersamudrala5314]

Wonderful explanation! Simple and crisp.

[@saadkhalid25]

seriously, you need to make more of these videos.

[@NicoleMurray01]

Thank you Pieter. This was a very simple and clear explanations. I will be checking out more of your stuff. I hope to find more networking videos.

[@ClaxxClaxx]

This is what it's being called brilliant explanation! Thanks!

[@crazynatassa]

You have to make more videos. These are the best videos on youtube on networks. Keep up the good work.

[@ajaytamang5957]

Pieter you are just awesome...Thanks for this video and your simplest explanation of such a complex tropics

[@miloblue6740]

One of the best explained videos i have ever seen.....thumbs up!

[@rajeshs7477]

Really a very good explanation. Even a beginner can easily understand it. Thank you Pieter.

[@shanakaj007]

172.16 is also a prviate IP guess that's just a comment. It's a amazing work by you. 5/5 great work. easy to understand.

[@stspringer2003]

Man, You are a great teacher. Very clear and understandable. Thanks

[@lukinhazbr]

dear lord, best explanation ever. And I'm not even a native english speaker.

[@BrightBitGAMES]

What happens when John's Laptop and Jane's Laptop are both trying to send request packages to the same webserver? How does the router determine where each response belongs to? In this case the NAT Forwarding Table would have two entries where each entry has the same "public side" info.

[@sebimoe]

Usually the local port is not the same, but let's assume it actually is, it still would work. Let's say we have: - Ann's computer (A) with local IP 192.168.0.2 - Bob's laptop (B) with local IP 192.168.0.3 - Router with local IP 192.168.0.1 and public IP 88.88.88.88 - Remote server with IP 33.33.33.33 Ann sends out packet [192.168.0.2:12345 -> 33.33.33.33:80], the router changes it to [88.88.88.88:50001 -> 33.33.33.33:80] Bob sends out packet [192.168.0.3:12345 -> 33.33.33.33:80], the router changes it to [88.88.88.88:50002 -> 33.33.33.33:80] Now, the NAT Forwarding Table looks like this: Local Socket < - > Public Socket 192.168.0.2:12345 88.88.88.88:50001 192.168.0.3:12345 88.88.88.88:50002 Now, when the server responds to 88.88.88.88:50002, the router will know, because of the 50002 port, that it should be translated to port 12345 and sent to 192.168.0.3 I hope I didn't overcomplicate stuff :s

[@BrightBitGAMES]

Sebastian Grygiel Ah, so the port is also stored and there is a different port for every PC connected to the router. I see now. Thank you very much!

[@staph95]

Sebastian Grygiel Thank you for the answer! it's clear and simple!!

[@EddieSundvall]

Exactly the explanation I was looking for, been wondering about this subject for some time. Very pedagogic script and images/animations. You deserve a subscription!

[@sethusuresh9196]

this is the best video on NAT. I've been trying to understand this for a long time. Thanks a lot and keep rolling out such informative videos

[@leepettit9516]

Thanks a lot !!!!im not very computer savy & have read some articles but still didn't get. You explained it so simply and consicely I got first time thanks heaps for clearing it up simply :)

[@raw0nline]

Liked cause it is requesting the weather report for San Antonio! Although its almost never 64 degrees here, unless it's winter. :D

[@sankaeureka4989]

Thank you so much for this lesson.............i have learned lot about NAT

[@muccapazza8869]

This is the best explanation for this topic on the internet. thanks for sharing much appreciated :)

[@tiggreen]

Great videos Pieter. Please keep posting more videos about networking. Would love to watch more videos about IP protocol stack.

[@ToanTran-ev8im]

Very helpful, details and comprehensive explaination, thanks alot.

[@chbanchban]

That is one dead clear explanation. thank you very much for this video