NAT Explained | Overload, Dynamic & Static

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What is NAT?
Network Address Translation (NAT) is used to convert private IP addresses to public IP addresses and vise versa.
The feature was introduced to prolong the life of IPv4 addresses. By using NAT you can convert all your private IP addresses to a single (or few) public address. This means a huge number of public addresses can be saved because the private addresses can be used over and over again in private networks across the world.
Types of NAT
There are three types of NAT, some more common than others but it’s a good idea to know exactly how each one works and how they can be used.
Static
Static NAT is when you manually assign each private IP address + port number a public IP address + port number. This could be used when running web server or mail serve.
Dynamic
The way Dynamic NAT works is by assigning each private IP to a public IP from a manually created pool of available public addresses.
You can use this to merge two networks with the same subnet together. You would configure the connecting routers to make the subnets appear to be different to what they actually are.
PAT (Overload)
Port Address Transaction (PAT) or Overload as it is often called is the most popular version used today.
The way PAT works is it converts the private address + port number to the public address + port number.
#ccna #cisco #networking

Пікірлер: 371

  • @yohaneranga8827
    @yohaneranga88276 жыл бұрын

    I do not normally comment on videos , but as most of the viewers may agree with me , you deserve more subscribers. Your explanations are by far one of the best ,even better than what they call industry experts. Keeping it simple and one explains one thing at a time makes it pretty stress free to watch and understand. Keep it up and I'm looking forward to see more advance networking concepts simplified.

  • @Certbros

    @Certbros

    5 жыл бұрын

    Thanks Yohan. Appreciate the comment. Glad it helped you out.

  • @schrodinger6991
    @schrodinger69914 жыл бұрын

    I am watching this because my class was cancelled because our school is closed because of the virus, therefor our teacher can't explan the content so he sent as the video.

  • @Certbros

    @Certbros

    4 жыл бұрын

    Thanks! It's really great to hear these videos are helping people during this time!

  • @mujtabaarfat717

    @mujtabaarfat717

    4 жыл бұрын

    because its closed becaused u want to study u watched it because u want to learn.

  • @FoX84tac022

    @FoX84tac022

    3 жыл бұрын

    Nothing like being supplied free content for a class your paying for... lol

  • @schrodinger6991

    @schrodinger6991

    3 жыл бұрын

    @@FoX84tac022 I am not paying for it education in Austria is free

  • @FoX84tac022

    @FoX84tac022

    3 жыл бұрын

    @@schrodinger6991 Well fuck me xD

  • @avengefulgamer3188
    @avengefulgamer31884 жыл бұрын

    This is a really great video. Im working on getting my CCNA and this really helped me understand how NAT works after school. thank you for the solid and slow paced information to let it sink in.

  • @Certbros

    @Certbros

    4 жыл бұрын

    Good to hear this video helped you out. Thanks for the comment!

  • @itaybarok9405
    @itaybarok94052 жыл бұрын

    Thanks. I understood the concept of NAT strongly now and why it is important. Also, I know types of NAT like PAT NAT and static NAT and dynamic NAT. Great and useful video. Keep up with these good staff.

  • @samuelnwadike9042
    @samuelnwadike90425 жыл бұрын

    i really appreciate your teaching skills, simple and effective direct to the point. i will really love more of your videos you got a new fan. if you have stuffs on CCNA recent stuff or even exam dumps please just send me the link thanks

  • @infamousstreaming2899
    @infamousstreaming28995 ай бұрын

    I got a computing exam coming up, this video explained it flawlessly compared to the notes. Appreciate it bro! also subscribed :))

  • @atharvabet1637
    @atharvabet16373 жыл бұрын

    Truly amazing! Just got what I was looking for. Please keep uploading such wonderful, crisp and informative videos in the upcoming time :))

  • @Certbros

    @Certbros

    3 жыл бұрын

    Thank you Atharva. More to come!

  • @shajondas9313
    @shajondas93137 жыл бұрын

    Thank you!!! Your videos are below 10 minutes and in this short time you gave the concrete concept and so much information indeed . Thank you again.....

  • @Certbros

    @Certbros

    7 жыл бұрын

    Thanks for the comment! I try and keep these videos as short and simple as possible so it's good to hear its working.

  • @infinitelooping
    @infinitelooping5 ай бұрын

    This video is a marvelous explanation of NAT, one of the bests I have ever seen. Well done

  • @tiramisu2717
    @tiramisu27175 жыл бұрын

    This is a solid explanation of different types of NATs. It has helped me solidify my understanding! Thanks.

  • @Certbros

    @Certbros

    5 жыл бұрын

    Thanks Ray!

  • @rikvanbrugge
    @rikvanbrugge2 жыл бұрын

    By a guy with no IT background at all: already on my sixth video today. Very clear text, good voices, excellent animations. Thanks a lot!

  • @Certbros

    @Certbros

    2 жыл бұрын

    Thank you Rik! Really great to hear your enjoying the the content.

  • @JP-ws4sv
    @JP-ws4sv4 жыл бұрын

    mate your videos are really good. your animation and voice really help simplify the essays ive read in CCNA books. thanks !

  • @Certbros

    @Certbros

    4 жыл бұрын

    Thanks Jit! Happy it helped

  • @MrHuzzy93
    @MrHuzzy937 жыл бұрын

    Great explanation! Keep the good work up. Highly appreciated!

  • @Certbros

    @Certbros

    7 жыл бұрын

    +Hussein Jasin FIRST COMMENT! Thanks!

  • @lenbrake4982
    @lenbrake49822 жыл бұрын

    Thank you for a carefully explained short clarification!

  • @guidowitt-dorring124
    @guidowitt-dorring124 Жыл бұрын

    This is the first video I've seen that properly explains NAT. Most others are too superficial and skip some details that are crucial to understand for the system to logically make sense.

  • @nileshgujar4310
    @nileshgujar43102 жыл бұрын

    You made it so easy to understand, as I read some articles and find myself scratching my head again n again ... Thank you

  • @Certbros

    @Certbros

    2 жыл бұрын

    You're welcome Nilesh! Happy to help 👍

  • @ransfordaddai6992
    @ransfordaddai699210 ай бұрын

    Great video., NAT simplified. i recommend this video to anyone struggling to understand this concept. Kindly do more of this video. the graphics, explanation and top notch

  • @arsalalam5998
    @arsalalam5998 Жыл бұрын

    great video. looks simple but all the required content in place.

  • @umunnahgentle6440
    @umunnahgentle6440 Жыл бұрын

    This is the first time i have been able to understand this NAT lecture. Thanks a lot. Please do you have a video on IS-IS and BGP configurations

  • @danteeep
    @danteeep4 жыл бұрын

    you explained better than any video on youtube ive checked so far.. thx

  • @Certbros

    @Certbros

    4 жыл бұрын

    Thanks!

  • @ok_gn
    @ok_gn4 ай бұрын

    Legend. Great teaching style. Thanks for the video.

  • @EcripArts
    @EcripArts7 жыл бұрын

    Glad I stumbled upon this channel. I'm setting up render servers at my office to connect to over VPN from home, with a pfSense server, but I had very limited understanding of why I had to do some things and how these things worked. So it's good to get some more background, I already understand alot more. Great work!

  • @Certbros

    @Certbros

    7 жыл бұрын

    Glad to hear the videos have helped you out! It's always great to get these comments. Nice intros by the way!

  • @EcripArts

    @EcripArts

    7 жыл бұрын

    Thanks, I appreciate it! Most of it is rather outdated actually! And keep up the good work, I like the visual part of the explanation. People have told me about alot of network related stuff but this makes it much more clear to me.

  • @ausmanx1161

    @ausmanx1161

    Жыл бұрын

    @@EcripArts what’s your job tittle now

  • @EcripArts

    @EcripArts

    Жыл бұрын

    @@ausmanx1161 Due to illness, unfortunately nothing anymore. I used this for building a render farm for my 3D work.

  • @jimyork8196
    @jimyork81965 жыл бұрын

    You took a somewhat mystifying concept and made it very easy to understand! Thanks!

  • @Certbros

    @Certbros

    5 жыл бұрын

    Thanks Jim!

  • @Black-xy4pj
    @Black-xy4pj Жыл бұрын

    Great video man! Thanks much

  • @nikhilchoubey5479
    @nikhilchoubey54795 жыл бұрын

    It is really short & simple explanation to understand it easily. Especially the slides representations helps a lot to understand. Thank you!!😊

  • @Certbros

    @Certbros

    5 жыл бұрын

    Thanks Nikhil. Happy it helped you out.

  • @simray7602
    @simray76027 жыл бұрын

    You deserve more subscriber , good animation make concept simple ,hope for more content coming

  • @Certbros

    @Certbros

    7 жыл бұрын

    Really appreciate the support Wind Luo! A lot more content planned in the very near future.

  • @kuvisharamnundlall1736
    @kuvisharamnundlall17364 жыл бұрын

    This was fantastic, well explained :) Will definitely be reviewing more videos

  • @Certbros

    @Certbros

    4 жыл бұрын

    Thanks Kuvisha

  • @azran1180
    @azran11803 жыл бұрын

    you are still replying, great and good video helped me for my assignments :)

  • @Certbros

    @Certbros

    3 жыл бұрын

    I try to reply to all comments if I can. Glad you liked the video and good luck with the rest of your assignments.

  • @TeX____
    @TeX____6 жыл бұрын

    very good and fast explanation of how NAT works. :)

  • @Certbros

    @Certbros

    6 жыл бұрын

    Thanks TeX!

  • @DonMalik99
    @DonMalik995 жыл бұрын

    excellent quick NAT explained, love it. Thanks

  • @Certbros

    @Certbros

    5 жыл бұрын

    Thanks Don!

  • @BLOEDLINK
    @BLOEDLINK5 жыл бұрын

    Again, Best explained video's on the net!

  • @Certbros

    @Certbros

    5 жыл бұрын

    Thanks Niels

  • @lnrkothapalli4106
    @lnrkothapalli41062 жыл бұрын

    After 2 or 3 days I got exact information what I am looking for thank u so much

  • @Certbros

    @Certbros

    2 жыл бұрын

    Great to hear it! Thanks for watching.

  • @andywarrier489
    @andywarrier489 Жыл бұрын

    I am basically a dumb person, but mate, you make me feel intelligent and that is priceless for me. Thanks a ton and cheers!

  • @Dragon-Slay3r

    @Dragon-Slay3r

    6 ай бұрын

    The pinky second finger yesterday was fake thats why they deploy bey cap cover for bullshit 😭 aslong as people make money who cares

  • @speensaba
    @speensaba7 жыл бұрын

    keep it up, good explaination.

  • @Certbros

    @Certbros

    7 жыл бұрын

    Thanks!

  • @mashabadigojane9261
    @mashabadigojane92612 жыл бұрын

    Thanks for the explanantion, extremely useful

  • @TabInvader
    @TabInvader4 ай бұрын

    Fantastic explanation!!

  • @jeshbargota7745
    @jeshbargota77457 жыл бұрын

    Cheers mate, simple but very effective !

  • @Certbros

    @Certbros

    7 жыл бұрын

    Thanks for the support!

  • @jaelski1217
    @jaelski12173 жыл бұрын

    I love you guys for this.

  • @Certbros

    @Certbros

    3 жыл бұрын

    Love you too man! 👊

  • @jeremyr8793
    @jeremyr87937 жыл бұрын

    Subscribed thanks for the vids! Keep it up!

  • @Certbros

    @Certbros

    7 жыл бұрын

    +Jeremy Ruan Thanks! A new batch of video is on the way soon.

  • @dencam
    @dencam4 жыл бұрын

    Thanks for the solid and precise explanation.

  • @Certbros

    @Certbros

    4 жыл бұрын

    Very welcome!

  • @jasonkittle326
    @jasonkittle3262 жыл бұрын

    Mine has a lot going on. Thank you!

  • @pantelisvasileiadis2858
    @pantelisvasileiadis28582 жыл бұрын

    thank you very much dude! very simply and well explained!

  • @Certbros

    @Certbros

    2 жыл бұрын

    Thanks Pantelis! Appreciate it 😁

  • @ayeshafatima266
    @ayeshafatima2663 жыл бұрын

    Great job 👍, please keep such wonderful videos coming. Thanks

  • @Certbros

    @Certbros

    3 жыл бұрын

    Thank you Ayesha!

  • @yashkummar
    @yashkummar4 жыл бұрын

    Thanks for sharing. Well explained.

  • @Certbros

    @Certbros

    4 жыл бұрын

    Your welcome

  • @BijouBakson
    @BijouBakson4 жыл бұрын

    Thank you, that was pretty useful

  • @vinnyseeram6418
    @vinnyseeram64183 жыл бұрын

    Great video! Would it be correct to say that the key difference between PAT and static NAT is the router building the NAT table vs manual configuration of the NAT table?

  • @ramprakashgovindaraj5343
    @ramprakashgovindaraj53437 жыл бұрын

    this is pretty much clear!! thank you for the video @certbros

  • @Certbros

    @Certbros

    7 жыл бұрын

    Thanks!

  • @L84AD88
    @L84AD88 Жыл бұрын

    Very nice vid made it easy to understand

  • @ranjitdhiwar8545
    @ranjitdhiwar85454 жыл бұрын

    Nice Explanation . Thank you so much !

  • @Certbros

    @Certbros

    4 жыл бұрын

    Thanks!

  • @fleurazure
    @fleurazure4 жыл бұрын

    Just wanted to say thanks for these very helpful videos! :)

  • @Certbros

    @Certbros

    4 жыл бұрын

    You're welcome! Thanks for the comment.

  • @smellthecoffee5314
    @smellthecoffee53145 жыл бұрын

    Great vid - there should be more like this one - I like the way the facts about the process are cross referenced to their real world applications - A lot of IT vids miss this and you end up not really understanding where the info actually fits in the real world. Should have more views.

  • @Certbros

    @Certbros

    5 жыл бұрын

    Actually! Real world examples help a lot

  • @8686joedog
    @8686joedog5 жыл бұрын

    Awesome tutorial. What about “open” nat. I remember years ago my xbox would struggle with multiplayer connections because it said my nat was not set to “open”.

  • @pavelkarvutev8051
    @pavelkarvutev80516 жыл бұрын

    Wow, finally I understand what NAT meant Big thanks, so good!

  • @Certbros

    @Certbros

    6 жыл бұрын

    Happy to help! Thanks.

  • @Randyorton98ful
    @Randyorton98ful3 жыл бұрын

    Thank you, this video is really helpful

  • @Certbros

    @Certbros

    3 жыл бұрын

    You're welcome. Glad it helped 👍

  • @mehdiroudeau8809
    @mehdiroudeau880911 ай бұрын

    the best explanation I have ever had

  • @Dragon-Slay3r

    @Dragon-Slay3r

    6 ай бұрын

    In this stupid game the only real fake Jesus is me 😂 If anyone needs an attorney let me know I can find them counters with KZread in court 😭😂

  • @satyavir8
    @satyavir8 Жыл бұрын

    Fantastic love ❤️ it man

  • @vaishalivg
    @vaishalivg2 жыл бұрын

    Excellent explanations 🔥🔥🔥

  • @zi0
    @zi06 жыл бұрын

    Very well done lads.

  • @Certbros

    @Certbros

    6 жыл бұрын

    Thanks Zi0!

  • @sastyinkaroly
    @sastyinkaroly8 ай бұрын

    You are the BEST!

  • @kabandajamir9844
    @kabandajamir98442 жыл бұрын

    The world's best teacher

  • @zangreiner1048
    @zangreiner1048 Жыл бұрын

    6 years since this video was published and i can confirm that it is still a great video

  • @iftyomar
    @iftyomar5 жыл бұрын

    Thank you very much for your lecture.

  • @Certbros

    @Certbros

    5 жыл бұрын

    You're welcome! Thanks Omar

  • @wexwexexort
    @wexwexexort5 жыл бұрын

    Best explanation I've seen so far.

  • @Certbros

    @Certbros

    5 жыл бұрын

    Thanks Mert

  • @marlymutos1000
    @marlymutos10002 жыл бұрын

    Thanks for the knowledge...

  • @jagdishsingh5877
    @jagdishsingh58775 жыл бұрын

    smoothly DONE !!!

  • @Certbros

    @Certbros

    5 жыл бұрын

    Thanks!!

  • @Uglyydidi
    @Uglyydidi5 ай бұрын

    Bro you a legend

  • @utoobbott8817
    @utoobbott8817 Жыл бұрын

    awesome explanation.

  • @Scruibyxmontages
    @Scruibyxmontages3 жыл бұрын

    Nice, feel like a genius now, really appreciated

  • @Certbros

    @Certbros

    3 жыл бұрын

    Haha! You are a genius now!

  • @TheAMOS45
    @TheAMOS457 жыл бұрын

    Amazing explanation . I got it on the first go

  • @Certbros

    @Certbros

    7 жыл бұрын

    Thanks! Glad it helped you out.

  • @Munchkie
    @Munchkie3 жыл бұрын

    I am curious, thx for explaining this :)

  • @Certbros

    @Certbros

    3 жыл бұрын

    No problem! Glad you liked it!

  • @azizbasitsheikh
    @azizbasitsheikh2 жыл бұрын

    Very well explained

  • @Brooksiebaby1113
    @Brooksiebaby11137 жыл бұрын

    Thank you for the explanations on the different types of NAT. The second edition of Information Security: The Complete Reference by Mark Rhodes-Ousley does not explain the concepts thoroughly enough for me. The sections of PAT,dynamic NAT, and static NAT were a little too brief. Your video broke it down just enough for me and the added visuals will help me to remember the particulars.

  • @Certbros

    @Certbros

    7 жыл бұрын

    Happy to hear it helped and thank you for commenting. Good luck with your studies!

  • @margaritafemenias1635
    @margaritafemenias16357 жыл бұрын

    Awesome video! helped a loot!!

  • @Certbros

    @Certbros

    7 жыл бұрын

    Thanks!!

  • @TimonLevy
    @TimonLevy Жыл бұрын

    Dude, this guy's voice is so calm I almost fell asleep watching this.

  • @ramchandrapatil2215
    @ramchandrapatil22154 жыл бұрын

    You explain with very clear and with example. Thanks.

  • @Certbros

    @Certbros

    4 жыл бұрын

    Glad you liked it 👍

  • @ramchandrapatil2215

    @ramchandrapatil2215

    4 жыл бұрын

    If possible can you please make videos for CCNP. It will really helpful to us and we don't need to anywhere for this.

  • @jdelarosa0325
    @jdelarosa03254 жыл бұрын

    Thanks I learned a lot very well explained.

  • @Certbros

    @Certbros

    4 жыл бұрын

    Thanks

  • @Laith.Alkhazragy
    @Laith.Alkhazragy6 жыл бұрын

    Thank you for the explanations

  • @Certbros

    @Certbros

    6 жыл бұрын

    You're welcome. Thanks for the comment.

  • @Gisbert-12843
    @Gisbert-128432 жыл бұрын

    Btw awesome explaining! Got an awesome voice!

  • @shakilalig
    @shakilalig5 жыл бұрын

    As usual.. Certbros rocks!!!!

  • @Certbros

    @Certbros

    5 жыл бұрын

    Thanks!!

  • @Aman2111
    @Aman21112 жыл бұрын

    Thats the skill, How beautifully he explained NAT.

  • @dothchabani8565
    @dothchabani85655 жыл бұрын

    Hi ! Thank you ! I finally understood how NAT works :D Just one thing, Dynamic NAT is a many to many mapping addresses not a one to one, that's according to ICND1 documentation ^^' Keep going ! :D

  • @lesleybw

    @lesleybw

    5 жыл бұрын

    I realised he confused NAT and Dynamic too there!! Great video nonetheless, it really helped clear this out for me!

  • @lesleybw

    @lesleybw

    5 жыл бұрын

    Static*

  • @tanvirhaider617
    @tanvirhaider6174 жыл бұрын

    thank you sir, you saved me a lot of time.

  • @Certbros

    @Certbros

    4 жыл бұрын

    You're welcome!

  • @vladradu4148
    @vladradu41483 жыл бұрын

    quality content, thank you!

  • @Certbros

    @Certbros

    3 жыл бұрын

    Thank you Vlad! Glad you liked it.

  • @ruck-tech7163
    @ruck-tech71634 жыл бұрын

    GREAT!!!! Thank U

  • @markazer2501
    @markazer25014 жыл бұрын

    God bless you my friend :) very good class indeed.

  • @Certbros

    @Certbros

    4 жыл бұрын

    Thanks!

  • @SwissPhil02
    @SwissPhil026 жыл бұрын

    excellent explanations!

  • @Certbros

    @Certbros

    6 жыл бұрын

    Thanks!

  • @Throdne
    @Throdne6 жыл бұрын

    Loved the video! Do you think you can explain masquerade? Also, can you make a video just like this explaining firewall rules and how they work. E.g. like what’s the difference between related established invalid and new etc. I️ own a edge router, and I’m slowly trying to teach myself how to write firewall rules. Also, QoS would be awesome as well!!! Thank you, Throdne

  • @Certbros

    @Certbros

    6 жыл бұрын

    Thanks Throdne! Masquerading is pretty much the Linux word for Overload/PAT in this video. I'm assuming your firewall is based on Linux so you likely have a SNAT (changes the source address) and DNAT (changes the destination address) option as well. Definitely going to do some security videos in the future!

  • @moogleworks501
    @moogleworks5015 жыл бұрын

    Great Video!

  • @Certbros

    @Certbros

    5 жыл бұрын

    Thanks Kenneth

  • @davidbenson7323
    @davidbenson73234 жыл бұрын

    This was great. I would recommend updating the overall style of the video as far as graphics, but otherwise, I understand NAT now. Thanks CertBros!

  • @Certbros

    @Certbros

    4 жыл бұрын

    Thanks. This is a bit of an old video now

  • @mudbone32
    @mudbone327 жыл бұрын

    very clear, thanks :)

  • @Certbros

    @Certbros

    7 жыл бұрын

    You're welcome! Thanks for the comment.

  • @toddpatrick7695
    @toddpatrick76955 жыл бұрын

    Excellent.... thank you.

  • @Certbros

    @Certbros

    4 жыл бұрын

    Thanks Todd!

  • @AlexS-yy9qu
    @AlexS-yy9qu4 жыл бұрын

    Awsome !

  • @pavelkarvutev8051
    @pavelkarvutev80516 жыл бұрын

    Love your channel

  • @Certbros

    @Certbros

    6 жыл бұрын

    Love the support!

  • @jolsky11
    @jolsky114 жыл бұрын

    Very useful!

  • @Certbros

    @Certbros

    4 жыл бұрын

    Glad it was helpful!

  • @user-or7ji5hv8y
    @user-or7ji5hv8y3 жыл бұрын

    Great explanation

  • @Certbros

    @Certbros

    3 жыл бұрын

    Glad it was helpful!

  • @Itsweet5533
    @Itsweet5533 Жыл бұрын

    0:26 start -- thanks for the video!

  • @oma_unashamed
    @oma_unashamed5 жыл бұрын

    Thanks. Good explanation.

  • @Certbros

    @Certbros

    5 жыл бұрын

    Thanks Oma

  • @razore9122
    @razore91225 жыл бұрын

    thnk you that was very helpful

  • @Certbros

    @Certbros

    5 жыл бұрын

    No problem! Thanks.

  • @mattwilson717
    @mattwilson7174 жыл бұрын

    As a new IT student I have no fucking clue what I just watched, but I’m sure I’ll come back to it

  • @Certbros

    @Certbros

    4 жыл бұрын

    Sure this might be a bit much to start with. Come back when you ready.

  • @juice2090
    @juice20906 жыл бұрын

    A pool is basically a really wide and flat bucket :D Great video

  • @Certbros

    @Certbros

    6 жыл бұрын

    Yes it is! It's a deep and narrow pool! haha.