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

[@yohaneranga8827]

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]

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

[@avengefulgamer3188]

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]

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

[@schrodinger6991]

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]

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

[@mujtabaarfat717]

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

[@FoX84tac022]

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

[@schrodinger6991]

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

[@FoX84tac022]

@@schrodinger6991 Well fuck me xD

[@itaybarok9405]

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.

[@tiramisu2717]

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

[@Certbros]

Thanks Ray!

[@atharvabet1637]

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

[@Certbros]

Thank you Atharva. More to come!

[@samuelnwadike9042]

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

[@shajondas9313]

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]

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

[@JP-ws4sv]

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

[@Certbros]

Thanks Jit! Happy it helped

[@MrHuzzy93]

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

[@Certbros]

+Hussein Jasin FIRST COMMENT! Thanks!

[@infamousstreaming2899]

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

[@rikvanbrugge]

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]

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

[@nileshgujar4310]

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

[@Certbros]

You're welcome Nilesh! Happy to help 👍

[@infinitelooping]

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

[@danteeep]

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

[@Certbros]

Thanks!

[@lenbrake4982]

Thank you for a carefully explained short clarification!

[@jimyork8196]

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

[@Certbros]

Thanks Jim!

[@simray7602]

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

[@Certbros]

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

[@guidowitt-dorring124]

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.

[@ok_gn]

Legend. Great teaching style. Thanks for the video.

[@TeX____]

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

[@Certbros]

Thanks TeX!

[@ransfordaddai6992]

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

[@umunnahgentle6440]

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

[@nikhilchoubey5479]

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

[@Certbros]

Thanks Nikhil. Happy it helped you out.

[@EcripArts]

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]

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

[@EcripArts]

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]

@@EcripArts what’s your job tittle now

[@EcripArts]

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

[@BLOEDLINK]

Again, Best explained video's on the net!

[@Certbros]

Thanks Niels

[@azran1180]

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

[@Certbros]

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

[@kuvisharamnundlall1736]

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

[@Certbros]

Thanks Kuvisha

[@arsalalam5998]

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

[@lnrkothapalli4106]

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

[@Certbros]

Great to hear it! Thanks for watching.

[@speensaba]

keep it up, good explaination.

[@Certbros]

Thanks!

[@Black-xy4pj]

Great video man! Thanks much

[@TabInvader]

Fantastic explanation!!

[@pavelkarvutev8051]

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

[@Certbros]

Happy to help! Thanks.

[@andywarrier489]

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]

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

[@DonMalik99]

excellent quick NAT explained, love it. Thanks

[@Certbros]

Thanks Don!

[@mehdiroudeau8809]

the best explanation I have ever had

[@Dragon-Slay3r]

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 TH-cam in court 😭😂

[@jaelski1217]

I love you guys for this.

[@Certbros]

Love you too man! 👊

[@jeshbargota7745]

Cheers mate, simple but very effective !

[@Certbros]

Thanks for the support!

[@mashabadigojane9261]

Thanks for the explanantion, extremely useful

[@8686joedog]

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”.

[@smellthecoffee5314]

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]

Actually! Real world examples help a lot

[@kabandajamir9844]

The world's best teacher

[@Brooksiebaby1113]

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]

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

[@dencam]

Thanks for the solid and precise explanation.

[@Certbros]

Very welcome!

[@jasonkittle326]

Mine has a lot going on. Thank you!

[@jeremyr8793]

Subscribed thanks for the vids! Keep it up!

[@Certbros]

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

[@zangreiner1048]

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

[@TimonLevy]

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

[@yashkummar]

Thanks for sharing. Well explained.

[@Certbros]

Your welcome

[@pantelisvasileiadis2858]

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

[@Certbros]

Thanks Pantelis! Appreciate it 😁

[@ayeshafatima266]

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

[@Certbros]

Thank you Ayesha!

[@L84AD88]

Very nice vid made it easy to understand

[@fleurazure]

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

[@Certbros]

You're welcome! Thanks for the comment.

[@davidbenson7323]

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]

Thanks. This is a bit of an old video now

[@zi0]

Very well done lads.

[@Certbros]

Thanks Zi0!

[@satyavir8]

Fantastic love ❤️ it man

[@ranjitdhiwar8545]

Nice Explanation . Thank you so much !

[@Certbros]

Thanks!

[@Itsweet5533]

0:26 start -- thanks for the video!

[@wexwexexort]

Best explanation I've seen so far.

[@Certbros]

Thanks Mert

[@vinnyseeram6418]

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?

[@Randyorton98ful]

Thank you, this video is really helpful

[@Certbros]

You're welcome. Glad it helped 👍

[@vaishalivg]

Excellent explanations 🔥🔥🔥

[@ramprakashgovindaraj5343]

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

[@Certbros]

Thanks!

[@azizbasitsheikh]

Very well explained

[@iftyomar]

Thank you very much for your lecture.

[@Certbros]

You're welcome! Thanks Omar

[@jagdishsingh5877]

smoothly DONE !!!

[@Certbros]

Thanks!!

[@BijouBakson]

Thank you, that was pretty useful

[@Uglyydidi]

Bro you a legend

[@TheAMOS45]

Amazing explanation . I got it on the first go

[@Certbros]

Thanks! Glad it helped you out.

[@utoobbott8817]

awesome explanation.

[@Aman2111]

Thats the skill, How beautifully he explained NAT.

[@ramchandrapatil2215]

You explain with very clear and with example. Thanks.

[@Certbros]

Glad you liked it 👍

[@ramchandrapatil2215]

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

[@dothchabani8565]

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]

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

[@lesleybw]

Static*

[@Scruibyxmontages]

Nice, feel like a genius now, really appreciated

[@Certbros]

Haha! You are a genius now!

[@shakilalig]

As usual.. Certbros rocks!!!!

[@Certbros]

Thanks!!

[@Throdne]

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]

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!

[@Gisbert-12843]

Btw awesome explaining! Got an awesome voice!

[@jdelarosa0325]

Thanks I learned a lot very well explained.

[@Certbros]

Thanks

[@sastyinkaroly]

You are the BEST!

[@marlymutos1000]

Thanks for the knowledge...

[@margaritafemenias1635]

Awesome video! helped a loot!!

[@Certbros]

Thanks!!

[@Laith.Alkhazragy]

Thank you for the explanations

[@Certbros]

You're welcome. Thanks for the comment.

[@tanvirhaider617]

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

[@Certbros]

You're welcome!

[@SwissPhil02]

excellent explanations!

[@Certbros]

Thanks!

[@moogleworks501]

Great Video!

[@Certbros]

Thanks Kenneth

[@pavelkarvutev8051]

Love your channel

[@Certbros]

Love the support!

[@vladradu4148]

quality content, thank you!

[@Certbros]

Thank you Vlad! Glad you liked it.

[@Munchkie]

I am curious, thx for explaining this :)

[@Certbros]

No problem! Glad you liked it!

[@toddpatrick7695]

Excellent.... thank you.

[@Certbros]

Thanks Todd!

[@juice2090]

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

[@Certbros]

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

[@AlexS-yy9qu]

Awsome !

[@ruck-tech7163]

GREAT!!!! Thank U

[@markazer2501]

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

[@Certbros]

Thanks!

[@user-or7ji5hv8y]

Great explanation

[@Certbros]

Glad it was helpful!

[@mudbone32]

very clear, thanks :)

[@Certbros]

You're welcome! Thanks for the comment.

[@jolsky11]

Very useful!

[@Certbros]

Glad it was helpful!

[@prashantkamble2393]

excellent explainations

[@Certbros]

Thanks!

[@mattwilson717]

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]

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

[@oma_unashamed]

Thanks. Good explanation.

[@Certbros]

Thanks Oma