TCP/IP for Programmers

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TCP/IP is the network protocol that makes the Internet and modern networking function, but even experienced coders may ask, "what's a default gateway?".
This class will teach the basic concepts of TCP/IP so that coders understand why it matters, and how it works. We'll discuss everything from what an IP Address is, to Name Resolution, TCP Ports, and a whole bunch more.
The class will go over:
Basic Concept of the Ethernet Standard
IP and MAC Addresses
Understanding Subnets
DHCP
Ethernet and TCP/IP Hardware
TCP Ports
DNS and Reverse DNS
Understanding URL's
PING, TRACEROUTE, IP and ARP Commands
Virtual Hosts in Apache and Web Servers
and more....

[@NiwatiX]

Hey Eli, I've been learning from you since I'm a young adult more than 10 years ago now my god. You helped me get a career, build, feed myself, get a car.. all of those things you played a small role everyday by teaching me your craft. I cannot be more grateful, thank you so much so so much. I've been teaching to the new generation with the same love and passion as you, everytime I'm assigned a new hire or an intern I keep you in my heart and I do the very best job I can do and I'm infinitely patient in honor to what you gave us a decade ago.

[@khshur2]

I watched you 5 years ago ..i had no IT experience what so ever .. now 5 years later im a Devops engineer on google cloud , just wanted to say ..thank you very much 🙏

[@zoethodou1405]

well done sir !

[@wanderaloney]

Great story, man, so happy for you

[@jacobrobinson2663]

Almost the same story here, except I’m a software engineer now. I used to watch this when I was starting to learn. Great videos!

[@dawid_dahl]

Well done! I have the same story, but I’m a Full-stack developer now. Thank you Eli, and thank you KZbin! 🤩

[@jag831]

Me too, I used to watch Eli back in 2020 when I didn't know anything yet, I'm on cyber now 👌🏼 a lot of gratefulness for Eli!

[@mystrdat]

Dude looks like a veteran bricklayer meets hobo yoga instructor who just so happens to record the best TCP/IP course ever as a weekend hobby.

[@WackNoir]

you are literally the greatest teacher of all time

[@liquite]

GTO is back

[@WhizPill]

It’s so great

[@cannaroe1213]

NOW IN 1440p! (i cant afford 4K)

[@chriss6390]

I remember learning about subnet masking from Eli in 2013 - eventually ended up working in the network world for awhile.

[@JR-47]

Astounding

[@ITHowToAsap]

Dude!!! me too!!! Back then I was like this guy is so smart, I dont know how I can ever know that much. Then 2 years later I started as help desk, and now I'm a DevOps Engineer. Crazy how time flies :)

[@All-about-te]

@@ITHowToAsap this gave me some hope :)

[@Timestamp_Heroes]

what is your salary? please give me a detailed roadmap

[@conpa18dany]

This guy been around for awhile, OG youtube teacher

[@reyuki-i]

timestamp: - ... - (If you see my comment before the video starts, please fill in the early timestamp!) - 51:15 - start discussing Layer 3 Networking - 53:00 - domain of network (?) - 57:25 - Dr. Eli wants to throw a Koosh ball into the virtual world? XD - 57:56 - start discussing specific protocol on layer 3, TCP/IP v4 - 59:39 - don't turn off ICMP unless you know what the hell you are doing (why though? answered on 1:01:32) - 1:02:38 - start discussing IP address - somewhere - subnet mask, network and host address - 1:08:00 - network and broadcast address (?) - 1:13:00 - highlight important thing to understand - 1:14:24 - private IP address - 1:17:38 - switches and ARP - 1:20:50 - a note on arp command - 1:22:00 - start discussing tcp port - 1:27:30 - problem with chinese product/device - 1:28:46 - start discussing router and default gateaway - 1:30:25 - you can demonstrate it with traceroute - 1:32:50 - what is a modem? - 1:34:25 - NAT and port forwarding - 1:41:42 - how noobs thinking (?) - 1:43:00 - port forwarding - 1:45:05 - be careful with CGNAT (my personal question: is it possible to perform tcp or udp hole punching on CGNAT scenario?) - 1:48:58 - problem with chinese product/device - 1:49:29 - start discussing internet facing static IP address - 1:51:44 - start discussing firewall - 1:55:54 - types or level of firewall (If MAC spoofing is possible, can you disconnect someone's IP while impersonating it? and thus bypass the firewall because you're now whitelisted?) - 1:58:40 - start discussing DNS - 2:03:30 - how hosts file can be useful XD - break for a minute, I will edit later.

[@Sg6CrossOver]

Very helpful, thank you

[@wennwenn1422]

Thanks bro!. This should be pinned

[@reyuki-i]

​@@wennwenn1422 It’s probably best not to pin it since the timestamp isn’t complete. I’m the kind of person who can’t stand waiting too long and prefers to dive in and practice right away :)

[@wennwenn1422]

@@reyuki-i atleast others can contribute too.

[@reyuki-i]

​@@wennwenn1422 you're right, I missed that point :)

[@yusrasuliman]

You have been my teacher since 2013. I had a seminar about VPN back then, and you guided me in creating a neat and impressive presentation on "How VPN Works". Many blessings, and thank you so much!❤

[@johnhanley2431]

I am very glad to see a video like this one. I have not watched it yet, as that will take me several days. I worked on the original design of TCP/IP while at AT&T Bell Labs. I attended many RFC meetings while we hammered out technical issues. Back then, a 300-baud modem was considered fast. Later I worked on the design of packet switching and ISDN which created cell phones and gave businesses 64 kilobit Internet connections. Shocking how things have changed yet stayed the same.

[@vaibhavsingh1049]

Your work let's me say, Thank youz to you while sitting in another corner of the world. Amazing

[@cate9541]

That's so cool

[@Brutal_Bandit]

Make some videos about it! I'd love to watch

[@ryangrogan6839]

Excellent work. I always think about how protocols that are 20+ decades old are still making the internet chug along. It must be very rewarding to see that the foundations you laid out are still holding firm for everything built upon it. I wonder what other protocols might look like, or what a better one would look like if we hadn't settled on TCP/IP. It's fascinating that we have somewhat pigeon holed ourselves into TCP/IP because our infrastructure relies so heavily on it. Would we ever switch to something better if we found it?

[@1DumbSquirrel]

thank you for your service :)

[@jafeta.7553]

This is the first time KZbin recommends your channel to me. Your channel looks like a gem.

[@Digitalgems9000]

yah a decade ago, lol

[@iamhereblossom1588]

@@Digitalgems9000is it not as a good anymore?

[@Digitalgems9000]

@@iamhereblossom1588 not really. his content is boring af vs the OG Eli

[@eddiephiri1763]

Eli made me comprehend networking concepts back in the day. His voice is one I recognize anytime! Great teacher!

[@palindrome8742]

I'm only at 10 minutes in to the video but this is amazing. You're describing so many frustrations and ... well I'm sure this is good for 3 hours. I'm gonna keep watching. Thank you for the video.

[@spartanghost_17]

I found this video by accident and you are probably the greatest teacher I have encountered

[@albeyreef]

well, same here

[@jefferyosei101]

You are amazing Eli - you are the reason I am a programmer today - been watching for a really really long and you are still so good, thank you.

[@gameonlive47]

Eli you're the reason why I am in IT industry today, thank you for contributing in my education process. Respect

[@nawfaltv5848]

I used to watch Eli in 2013 when i was 12 and i fell in love with his videos and his teaching style of no fluff; straight to the point (+ some rants), now fast forward 11 years later am a medical student and i still love computers and tech; and watching this video brings back so many memories.

[@TosinAnimashaun]

Ditto!

[@Hshjshshjsj72727]

Straight to the point? Guy Im 3:25 in and he still rambling about who-knows-what . Not tcip

[@orvillehenry9171]

Right 😅the guy is loyal to himself....that's why we get some insightful rants😅

[@getgudcyber924]

@@Hshjshshjsj72727 It’s like OP literally mentioned “(+ some rants)” Lol.

[@ThePieas]

this is top tier. thanks from the bottom of my heart.

[@MRF77]

Been a HUGE fan man since long time ago. My introduction to learning security and protocol was through you when you were still in prison wearing your orange jumpsuit yet teaching us incredible stuff. Respect.

[@uroshfr]

Thank you man, this is very helpful and also you do it with passion which makes it easier to understand, keep it up!

[@Iog]

Hey man, I'm in school for IT now, so I appreciate your content. In 4k too, that's awesome.

[@hamidullahmuslih6301]

ohh man, happy to see you after long time, i was heavily watching your vids in 2011, learned alot of things. ❣

[@TeodoricoSidonio]

You can't imagine how much I have learned from you! Keep up the great, great, great job Eli.

[@rickd8174]

You are awesome Eli. I've learned a lot from your videos over the last ten years. Thank you bro.

[@LHCB6]

My first thought: This is exactly what I need right now! My second thought: (after seeing the length) This might be more in depth than I originally thought.

[@janoscs.3647]

Eli, great stuff! Hope you not gonna get YT strike again... for TCP/IP ! Keep up the great, exceptional work mate! Best regards from Scotland!

[@LK-pw7fm]

I'm so glad you're back to being the computer guy.

[@go_better]

I'm at the DHCP section now, just wanted to say thanks! I just watch it bit by bit while eating and it's awesome and very educational

[@karimbenelhadj7171]

really enjoy your videos, wish I had time to participate in one of you dojo but my actual job is time consuming. Please keep what you're doing as it's on of the most useful and interesting content in this platform

[@vadinfekete9300]

I'm halfway into the video and I gotta say you're doing a really a good job at teaching (better than most of my actual teachers in Uni)

[@RoronoaZoro-qm8hp]

Wow, this brings back so many memories! I remember watching your channel during my college days, and it was such a huge help. It’s great to see you again - congratulations on hitting 1 million subscribers! Thanks so much!

[@mode4480]

Hey, not sure if you have been away for a while or I have just missed the videos, but bloody good to see you back, I owe a lot of my knowledge to your videos!

[@dragenn]

This is going to be a worthwhile watch

[@samuelhadush]

I learned a lot from you back in the early 2010s. Thank you!

[@GrishTech]

This is absolutely essential, even for those that don't develop.

[@ZombieBowTiie]

Dude, you got me through most of my classes in college back in the day. I am glad to see you are still at it with a million subs. Good shit dude

[@2022spacekw]

wow what a nice teacher you're this is the true spirit of internet

[@BillyBaruch]

Thank you for providing this! I am a software engineer. I DID study electrical engineering but do not have a degree. I started writing software and have been completely self-taught since the tender age of 15 (1979 🤣). Even at 60, I find that I still learn vast amounts if I put myself to actually do it. Your video came up in my feed and I said to myself, "Self, you could certainly use a decent TCP/IP refresher!!" I'm only 5 minutes into the video, but I appreciate some of your comments. Despite the desires of many, this knowledge, the kind of work that we do, does not require letters be bestowed upon us. But diligence in seeking good sources of knowledge and also in applying that knowledge is worth everything and is also within everyone's grasp! Time to buckle in for a good lesson!!

[@valeriusandof9782]

I remember watching your videos 9 year ago. You really helped me. Thank you!

[@ParrishKnowles]

😂😂😂Eli you’re awesome man! Also I appreciate your content that you have put out for more the 10+yrs and have taught me so much that I went from a guy that fixed PlayStations into a DevOps Engineer. Gratitude for being a great genuine influence👍🏾

[@vincentfernando10]

Missed this guy, one of the best. I consider him a mentor

[@elipaperni3458]

I watched your networking videos before interviews, they helped me land two jobs, back in 2013 and 2017

[@cyberlando]

Dude your work is a blessing I can’t even begin to thank you enough!

[@CyrenToom]

Omg you’re alive. Glad to see you still around. It’s been more than 10 years for me 😅

[@CodakProvision]

This was an excellent class. I got my Labs up and running.

[@simplifiedeconomics-globe]

your help was great! the way you teach is motivating and its impressing how you can break down complex topics into little snippets. Thank you

[@luiscastaneda9025]

love these "first principles" type videos.

[@BlueDolphinBlues]

I have learned so much from watching your videos. Thank you so much for all you do!

[@Gh0stlylee]

never seen a youtuber recognize my city , goat!

[@joelpww]

I started watching your TCP/IP, subnet masking vids from wayyy back. Crazy to see this again

[@thelandoftwitchclips]

holy shit, i havent seen this channel in like a decade

[@The404Studios]

Eli thank you, please keep using buddist analogys i been practing for about a year now i loved that introduction made me subscribe!

[@surfthechaos]

Eli the guru 🤘🏼 thank you for being a great teacher.

[@maxamedcalidhuux8083]

master of his field.

[@komalsinghgurjar]

I love sir, you are excellent teacher and is pure thoughts. ❤ from india

[@ibotah]

Well, this is a pleasant surprise. :) Hope you are well Eli! Glad you're still doing computer lessons

[@amanuelmehari9850]

Thanks for having a personality while teaching. its rare.

[@JustinDesignzz]

Great class! One of the best explanations of TCP/IP I've found...especially since I'm a crayon-eating jarhead!

[@KDill893]

I remember my IT teacher at highschool back in 2007 said that ipv6 was going to be the new standard. Fun stuff.

[@nataliayarysheva7316]

Thanks a lot for this lecture! I wish I found your channel before taking my CompTIA a+ exam. East to follow and all necessary info, awesome video!

[@mahamattchalle3198]

Thank you M. Eli, you had help very much my class in linux courses.

[@vanillarodent]

u dont understad how badly i needed this video thanks

[@arturwelp1877]

Very good video. My networking class was real bad in College, I had to learn all this by myself latter. My next step is to create a multi layer network at home, to separate my domestic traffic from my company traffic.

[@matthewsodetola9359]

Without Eli, I will probably never have a career as an Architect. God bless you Eli

[@getgudcyber924]

@@pepeshopping I mean, it’s quite literally the same for most people in tech that went through college. But alright lol. Eli’s content is technically “free” to viewers that don’t donate to his org. So, I don’t really get the point of trying to belittle someone because they learned from someone else.

[@svysvr4268]

👍 @ 2:34:45 , @2:52:41 : I'm awake. good job of entertaining and educating. thanks for you efforts. I definitely will be sending a contribution as soon as the economy transitions after Monday. Great labs simple but powerful.

[@Construction-agencyCoUk]

Just watched up to 2:33 mins and I’m loving it. You’re so cool Eli! Thank you

[@brandone7273]

Glad to see you putting tutorials up!

[@RJin3D]

Video quality is much better!

[@elithecomputerguy]

I setup a second camera that record 4K 30fps...

[@HolloMatlala1]

Hi Eli and @RJin3D is it okay if I vent on here without sounding troll: #SaluteDave I'm very #JigglyPuff 😡😡😡😡 that Metaverse and 4D VR Websites and Internet 3.0 have not sorted this mess out And even the Darkweb has done this better, Wait where and how does the Darkweb servers work. And do they also use blockchain to decentralized data packets and data all over different locations

[@Kur3b]

Welcome back Eli. I have been watching you for years

[@kriishnakanth]

Your point about education is really true.. Education is commercialized so much these days, educational institutes have moved away from running with donations to running with huge fee and deposits. In many country countries this begins from schooling.

[@Moped_Mike]

That’s because religion isn’t as big so people don’t feel guilty about taking advantage of donation based services…

[@fin31337]

The response is directed to a previously opened port on the router, which then identifies the specific device listening on that port and forwards the response accordingly to previously opened port on this particular device. Typically, I believe, these ports remain the same, but they can be modified if necessary.

[@mondskiez309]

I first encountered this channel circa 2012-2013 is and it was definitely Eli that pushed me over the edge to try Linux.. 11 years later, I'm automating the provisioning of multiple server distros via Ansible.. Thank you Sir, for all that you do..

[@mabdirizak]

I can't believe KZbin recommeneded this channel ❤

[@shadidhaque1009]

I have a career in tech because of this dude's videos from back in 2014😆

[@MahalaSorrell-zo5bh]

Best channel I've found in a while!

[@gabor_kov]

This was very informative and easy to digest, you have a great teaching style. Thank you

[@joshgarcia6344]

Holy shit I haven't seen an Eli vid since the whole debacle with youtube striking his channel. But I remember learning Linux basics from him in 2013. Crazy to see this on my feed.

[@Kadmanx]

I’m learning this in school right now but I can already tell he’s going to have me much more engaged 😍😜

[@tosinfaleyimu8405]

The OG Tech Mentor!! 🙌🏼🙌🏼

[@PhilsArtVibes]

IT teacher hand writing is always something else

[@alfonzo7822]

That explains my handwriting. I must be destined to teach IT.

[@masterfitter83]

I never comment, but I appreciate you giving back!!

[@pratiushkumar8188]

Great lesson Eli! Learning from India.

[@axelandru9346]

Mike: - Eli, when you clean that whiteboard, why don't you cover the edges, you always leave the edges dirty ! Dr. Eli: - Again, I have worked with whiteboards for almost 30 years now.

[@comosaycomosah]

been awhile since ive watched ya might as well tune in for an oldie newie goodie lol

[@jyuangrace4502]

Eli welcome back! We love your content!

[@imanidioli]

I enjoyed and learned every second of this tutorial

[@Zac2241]

Thanks!

[@countermeasuresecurityengineai]

He’s Back!!!!! OMG haven’t seen this in my feeds for yrs! wtf

[@orvillehenry9171]

Mr. Eli 🎉the C-guy (when I watch you it's like going to a classroom)

[@vitostamatti4792]

just discovered this channel. Amazing content! thanks for sharing!

[@lorenzozapaton4031]

Remaking one of the oldies is so fucking nice, man.

[@elizabeth3280]

I know Eli is not actively developing like me but he still dropping legit knowledge that applies to enterprise wide scale hetero hybrid envirnments and its as if he hacked my onenote on the matter and added his expertise. eli is often spot till this day...Eli let me refer you for a 100% remote job 😂

[@alphamaster2]

Eli you are Back!!!

[@funkiam9214]

love your videos brother!stay strong! Greetings from Europe

[@ProgrammingWIthRiley]

Yup exactly what I was looking for as I scrolled

[@docmalitt]

Before we even start.. I thought this was the video from nin... or te.. or (ust saw one comment) 11y ago!!! I'm so old. There was a similar video (series if I remember well) of you doing all this with just the white board and you had a magic marker. No 4K. Happy circle of life Eli (the Computer Guy). After you were cruising the country in your RV and... you know what? F nostalgia.. I'd still do all the same things and wouldn't change a god damn thing. Except then I thought IT wasn't for me. Oh how wrong I was 🤣

[@jairseedorf]

I really hope you enjoyed that beer, great video

[@Cluni-80s]

Man, this brings back memories :) one of the first and best IT teachers on this damned platform. All the best to you buddy.

[@FrontendNerd-lg3oh]

God is real ! All the best

[@tonylangworthy5479]

I've been at this for awhile myself... I like your story about learning C++. Back in the early 2000's, I also went through a book and "learned" the basics of C++, but I struggled to make something useful with it. With very little knowledge and very few resources like we have nowadays, I gave up on C++. JavaScript and PHP were easier to learn and make something useful with, at the time.

[@leaky3955]

2:40 I believe the tree in our case is having ample time to focus on learning, explore and absorb concepts. If you’re learning something new or switching careers later in life when many responsibilities demand your time, a tree is a hot commodity.

[@brandonfarfan1978]

A big thanks for this lesson. Thanks! This was like revision for me.👍