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
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
5 жыл бұрын
Thanks Yohan. Appreciate the comment. Glad it helped you out.
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
4 жыл бұрын
Thanks! It's really great to hear these videos are helping people during this time!
@mujtabaarfat717
4 жыл бұрын
because its closed becaused u want to study u watched it because u want to learn.
@FoX84tac022
3 жыл бұрын
Nothing like being supplied free content for a class your paying for... lol
@schrodinger6991
3 жыл бұрын
@@FoX84tac022 I am not paying for it education in Austria is free
@FoX84tac022
3 жыл бұрын
@@schrodinger6991 Well fuck me xD
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
4 жыл бұрын
Good to hear this video helped you out. Thanks for the comment!
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.
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
I got a computing exam coming up, this video explained it flawlessly compared to the notes. Appreciate it bro! also subscribed :))
Truly amazing! Just got what I was looking for. Please keep uploading such wonderful, crisp and informative videos in the upcoming time :))
@Certbros
3 жыл бұрын
Thank you Atharva. More to come!
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
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.
This video is a marvelous explanation of NAT, one of the bests I have ever seen. Well done
This is a solid explanation of different types of NATs. It has helped me solidify my understanding! Thanks.
@Certbros
5 жыл бұрын
Thanks Ray!
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
2 жыл бұрын
Thank you Rik! Really great to hear your enjoying the the content.
mate your videos are really good. your animation and voice really help simplify the essays ive read in CCNA books. thanks !
@Certbros
4 жыл бұрын
Thanks Jit! Happy it helped
Great explanation! Keep the good work up. Highly appreciated!
@Certbros
7 жыл бұрын
+Hussein Jasin FIRST COMMENT! Thanks!
Thank you for a carefully explained short clarification!
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.
You made it so easy to understand, as I read some articles and find myself scratching my head again n again ... Thank you
@Certbros
2 жыл бұрын
You're welcome Nilesh! Happy to help 👍
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
great video. looks simple but all the required content in place.
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
you explained better than any video on youtube ive checked so far.. thx
@Certbros
4 жыл бұрын
Thanks!
Legend. Great teaching style. Thanks for the video.
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
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
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
Жыл бұрын
@@EcripArts what’s your job tittle now
@EcripArts
Жыл бұрын
@@ausmanx1161 Due to illness, unfortunately nothing anymore. I used this for building a render farm for my 3D work.
You took a somewhat mystifying concept and made it very easy to understand! Thanks!
@Certbros
5 жыл бұрын
Thanks Jim!
Great video man! Thanks much
It is really short & simple explanation to understand it easily. Especially the slides representations helps a lot to understand. Thank you!!😊
@Certbros
5 жыл бұрын
Thanks Nikhil. Happy it helped you out.
You deserve more subscriber , good animation make concept simple ,hope for more content coming
@Certbros
7 жыл бұрын
Really appreciate the support Wind Luo! A lot more content planned in the very near future.
This was fantastic, well explained :) Will definitely be reviewing more videos
@Certbros
4 жыл бұрын
Thanks Kuvisha
you are still replying, great and good video helped me for my assignments :)
@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.
very good and fast explanation of how NAT works. :)
@Certbros
6 жыл бұрын
Thanks TeX!
excellent quick NAT explained, love it. Thanks
@Certbros
5 жыл бұрын
Thanks Don!
Again, Best explained video's on the net!
@Certbros
5 жыл бұрын
Thanks Niels
After 2 or 3 days I got exact information what I am looking for thank u so much
@Certbros
2 жыл бұрын
Great to hear it! Thanks for watching.
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
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
keep it up, good explaination.
@Certbros
7 жыл бұрын
Thanks!
Thanks for the explanantion, extremely useful
Fantastic explanation!!
Cheers mate, simple but very effective !
@Certbros
7 жыл бұрын
Thanks for the support!
I love you guys for this.
@Certbros
3 жыл бұрын
Love you too man! 👊
Subscribed thanks for the vids! Keep it up!
@Certbros
7 жыл бұрын
+Jeremy Ruan Thanks! A new batch of video is on the way soon.
Thanks for the solid and precise explanation.
@Certbros
4 жыл бұрын
Very welcome!
Mine has a lot going on. Thank you!
thank you very much dude! very simply and well explained!
@Certbros
2 жыл бұрын
Thanks Pantelis! Appreciate it 😁
Great job 👍, please keep such wonderful videos coming. Thanks
@Certbros
3 жыл бұрын
Thank you Ayesha!
Thanks for sharing. Well explained.
@Certbros
4 жыл бұрын
Your welcome
Thank you, that was pretty useful
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?
this is pretty much clear!! thank you for the video @certbros
@Certbros
7 жыл бұрын
Thanks!
Very nice vid made it easy to understand
Nice Explanation . Thank you so much !
@Certbros
4 жыл бұрын
Thanks!
Just wanted to say thanks for these very helpful videos! :)
@Certbros
4 жыл бұрын
You're welcome! Thanks for the comment.
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
5 жыл бұрын
Actually! Real world examples help a lot
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”.
Wow, finally I understand what NAT meant Big thanks, so good!
@Certbros
6 жыл бұрын
Happy to help! Thanks.
Thank you, this video is really helpful
@Certbros
3 жыл бұрын
You're welcome. Glad it helped 👍
the best explanation I have ever had
@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 😭😂
Fantastic love ❤️ it man
Excellent explanations 🔥🔥🔥
Very well done lads.
@Certbros
6 жыл бұрын
Thanks Zi0!
You are the BEST!
The world's best teacher
6 years since this video was published and i can confirm that it is still a great video
Thank you very much for your lecture.
@Certbros
5 жыл бұрын
You're welcome! Thanks Omar
Best explanation I've seen so far.
@Certbros
5 жыл бұрын
Thanks Mert
Thanks for the knowledge...
smoothly DONE !!!
@Certbros
5 жыл бұрын
Thanks!!
Bro you a legend
awesome explanation.
Nice, feel like a genius now, really appreciated
@Certbros
3 жыл бұрын
Haha! You are a genius now!
Amazing explanation . I got it on the first go
@Certbros
7 жыл бұрын
Thanks! Glad it helped you out.
I am curious, thx for explaining this :)
@Certbros
3 жыл бұрын
No problem! Glad you liked it!
Very well explained
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
7 жыл бұрын
Happy to hear it helped and thank you for commenting. Good luck with your studies!
Awesome video! helped a loot!!
@Certbros
7 жыл бұрын
Thanks!!
Dude, this guy's voice is so calm I almost fell asleep watching this.
You explain with very clear and with example. Thanks.
@Certbros
4 жыл бұрын
Glad you liked it 👍
@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.
Thanks I learned a lot very well explained.
@Certbros
4 жыл бұрын
Thanks
Thank you for the explanations
@Certbros
6 жыл бұрын
You're welcome. Thanks for the comment.
Btw awesome explaining! Got an awesome voice!
As usual.. Certbros rocks!!!!
@Certbros
5 жыл бұрын
Thanks!!
Thats the skill, How beautifully he explained NAT.
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
5 жыл бұрын
I realised he confused NAT and Dynamic too there!! Great video nonetheless, it really helped clear this out for me!
@lesleybw
5 жыл бұрын
Static*
thank you sir, you saved me a lot of time.
@Certbros
4 жыл бұрын
You're welcome!
quality content, thank you!
@Certbros
3 жыл бұрын
Thank you Vlad! Glad you liked it.
GREAT!!!! Thank U
God bless you my friend :) very good class indeed.
@Certbros
4 жыл бұрын
Thanks!
excellent explanations!
@Certbros
6 жыл бұрын
Thanks!
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
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!
Great Video!
@Certbros
5 жыл бұрын
Thanks Kenneth
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
4 жыл бұрын
Thanks. This is a bit of an old video now
very clear, thanks :)
@Certbros
7 жыл бұрын
You're welcome! Thanks for the comment.
Excellent.... thank you.
@Certbros
4 жыл бұрын
Thanks Todd!
Awsome !
Love your channel
@Certbros
6 жыл бұрын
Love the support!
Very useful!
@Certbros
4 жыл бұрын
Glad it was helpful!
Great explanation
@Certbros
3 жыл бұрын
Glad it was helpful!
0:26 start -- thanks for the video!
Thanks. Good explanation.
@Certbros
5 жыл бұрын
Thanks Oma
thnk you that was very helpful
@Certbros
5 жыл бұрын
No problem! Thanks.
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
4 жыл бұрын
Sure this might be a bit much to start with. Come back when you ready.
A pool is basically a really wide and flat bucket :D Great video
@Certbros
6 жыл бұрын
Yes it is! It's a deep and narrow pool! haha.