How TCP really works // Three-way handshake // TCP/IP Deep Dive

[@haphamdev]

I'm a software developer with a little networking background. Today I've learnt a lot more networking knowledge than my 5 years at the university. What a brilliant video. Thank you very much.

[@saucegotti8538]

sounds like you didn’t pay attention in university

[@HungNguyen-zx5zf]

@@saucegotti8538 not everyone could handle all knowledge (and remember them) from university until they get their hand dirty on real world, genius.

[@anonShrivastav]

​@@saucegotti8538😂

[@mwafulirwa1]

@@saucegotti8538 it depends on the university i thnk...my college sucked, had to learn almost 90% of the things i know now on my own

[@dbug7276]

😅😅😅😅😂😂😂😂🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣 Madman

[@Jarek.]

I couldn't believe that I would watch 1hr video on 3-way handshake and claim it was fascinating!

[@davidbombal]

Glad you enjoyed it! 😀

[@JeremysITLab]

Found my weekend watching! Great stuff, loving the details on TCP.

[@davidbombal]

Thanks Jeremy! Great to see you here again 😀

[@junaidjaved4792]

Jeremys IT lab sir 😍😍😍😍😍❤❤❤❤

[@nevarius9010]

The GOAT

[@aaqibshafiq5468]

Please add some topics :-dhcp/dns/arp

[@evanstayuka381]

Jeremy IT Lab, Sir your lessons are gold

[@thecuriousengineer]

This is the greatest TCP/IP lesson I have ever watched. Thank you both, David and Chris! :)

[@davidbombal]

// MENU // 00:00 ▶ Intro 01:32 ▶ The beginnings of TCP 03:57 ▶ Three way handshake 07:20 ▶ SYN meaning/explanation 08:50 ▶ Port numbers 09:58 ▶ What actually happens in the handshake 14:19 ▶ Common starting TTL values 15:04 ▶ Why we need SYN numbers 16:11 ▶ What actually happens in the handshake (cont'd) 19:00 ▶ Q&A (SYN,SYN-ACK,ACK - Sequence numbers - Increments - Tips) 33:01 ▶ History of TCP 34:44 ▶ TCP options 36:56 ▶ TCP flags 41:53 ▶ TCP Window - window size and scale 59:04 ▶ MSS (Maximum Segment Size) 59:49 ▶ SACK (Selective Acknowledgement) 01:00:13 ▶ Conclusion // PCAP File // Wireshark TCP pcap file: www.dropbox.com/s/l5p8ofik86zeieh/TCP-Handshake_ChrisGreer.zip?dl=0 // MY STUFF // www.amazon.com/shop/davidbombal // SOCIAL // Discord: discord.com/invite/usKSyzb Twitter: twitter.com/davidbombal Instagram: instagram.com/davidbombal LinkedIn: www.linkedin.com/in/davidbombal Facebook: facebook.com/davidbombal.co TikTok: tiktok.com/@davidbombal KZbin: kzbin.info //CHRIS GREER // LinkedIn: www.linkedin.com/in/cgreer/ KZbin: kzbin.info Twitter: twitter.com/packetpioneer Pluralsight: TCP Analysis Course: davidbombal.wiki/tcpwireshark // SPONSORS // Interested in sponsoring my videos? Reach out to my team here: [e-mail] Please note that links listed may be affiliate links and provide me with a small percentage/kickback should you use them to purchase any of the items listed or recommended. Thank you for supporting me and this channel!

[@trentmcgrath9712]

EXCELLENT

[@joelhorensma8036]

David, are you really ex NSA or is it a media stunt?

[@TampaRedd]

What software was used to capture this podcast/video? I know it's not Zoom, appears to be full HD or better quality.

[@vicdan90]

@David Bombal Hello, We would like to listen about future of Data Sciencist ,plus their Job roles. Your Thoughts will be great to us who Interest and will invest their learning in this data scientist roles . Thanks since now on.

[@yeayea8334]

1:47 troubleshooting starts from tcp 4:13 lets see three way handshake 7:11 the sequence number 10:10 Wireshark speak to us 26:18 the key to understand tcp 29:21 David summarizes 30:38 Chris method 34:50 options 37:00 flags 41:53 window 44:00 swimming pool

[@phil2768]

When you can listen to something like this as a podcast (not watching), while working on something else (I was tidying up), and can understand everything that was talked about then you know that the person talking not only knows what they are talking about, inside and out, but can also explain and teach it clearly. That was excellent 👌🏻

[@nuxboxen]

I have to say WOW... the way you two work together is just tremendous. This is really easy to listen to and really conducive to learning.

[@ZeyRonTT]

I thought CCNA 200-301 had a lot of information about TCP ... Until I watched this video, thanks for a great video. Learned alot

[@partspieces8165]

I'm loving these interviews with David & Chris. Really is valuable. 2 networking pros having a talk like a teacher & student scenario for us beginners to understand better & making it more engaging. Thanks so much!

[@IMAND93]

It really shows how much Chris is more experienced with teaching. A great way of repeating the same thing in different ways until it makes sense. That's why I like your videos, guys. Overall very informative video, about Wireshark and TCP both.

[@CFH298]

Can you create a playlist containing all videos with Chris? This was so invaluable and combined with reading TCP/IP Guide it all makes sense. Thanks all!

[@davidbombal]

Here you go: kzbin.info/aero/PLhfrWIlLOoKO8522T1OAhR5Bb2mD6Qy_l

[@CFH298]

@@davidbombal You’re the best :)

[@SiddhantSwami]

@@davidbombal You are the best, David!!!!!!

[@AshleyEhSMR]

@James Great question! Appreciate you 🎊 And David wasted no time. The playlist I didn’t know I needed today ❤️🙌🫶

[@simplekindofman8867]

This is so incredibly thorough. Great job!!

[@jean-ericrioux4726]

This is so well explained. I will use this video as a complement to the training I do internally to colleagues. I'm somewhat THE tcp and Wireshark guy at work, and often gets technical questions / request to troubleshoot something, even protocols I never worked with. Here's some things I really liked in this video: - When you mentionned to ''Please capture the TCP handshake''. You're so spot on ! It's just so critical to have - In TCP Options, MSS is not negociated but announced. (so many times I had to tell people this) - SACK has to be enabled and announced in both Syn and Syn Ack. Here are some suggestions of topic you could discuss in the future: - Same video with ICMP (explaining all the codes, etc) - A bit more depth on MSS (MSS vs MTU and fragmentation issues....just had one yesterday! :) ) - Get some packet loss captures and demonstrate where is the packet loss (example: If you see original packet + retransmission you can assume the loss is after the capture point, etc, etc) Great work !

[@MSSMusChaos]

One full hour of knowledge, thank you Chris for giving a easy-to-follow introduction.

[@CyberNancy]

I appreciate how David and Chris present the basics, while so much of the modern movement has forgotten these core elements.

[@confidential303]

you may say with confident most of people don't know this

[@kapilsonyt]

Been following Chris for long time and having watched his all TCP wireshark videos, it's glad to have you here digged deeper TCP again for us. Thanks David and Chris.

[@davidbombal]

Thank you and you're welcome!

[@ChrisGreer]

Thanks Kapil! Great to meet you.

[@dushyantsinghshekhawat969]

You are doing very great by providing free knowledge to everyone. And the content is also superb.

[@davidbombal]

Thank you!

[@educastellini]

-Great content professor David Bombal, and Chris Greer...!!! -Always nice when we look at the essentials in depth again. -TCP/IP, Three way handshake is the basis of almost all communication that we have in the network. -Great, this conversation and remembering in depth what we studied with the view of colleagues....!!! -Thanks for the knowledge teachers David Bombal, and Chris Greer...!!!

[@northblue8216]

Wow!! Fantastic stuff. Do you know, my life just flashed before my eyes.... A+, Network+, This video series, then CCNA!

[@melanynieto446]

This is SUCH a GOOD explanation!! I can't believe it's free on KZbin. Thanks a lot for this!

[@ricardow1130]

Just started studying for my eJPT and holy smokes did this video add value to what I've just learned. Can't wait for more in depth!

[@charlesikpeme7777]

Thanks David, the networking world is better because of you. Thanks for mentoring millions of people.

[@davidbombal]

Thank you Charles!

[@klwthe3rd]

Unlike the John Hammond video, this content is extremely valuable. Chris is an expert in the networking/packet analysis field and did a beautiful job breaking down these concept so one learning Wireshark gets the most out of the data packets and software. You need to create a play list just with Chris, having all his topics under one place. This just might be the single best educational video on the 3 way handshake on KZbin. I would like to see common problems/solutions that occur often in the real world where Chris would be called out for diagnosis.

[@lewisyaworski8962]

This was outstanding! Not only did it show me the true value of Wireshark, it taught me more about what is happening between the client and the server. Great work!

[@naveen0723]

Simply 🙏🏻,Eagerly waiting for next video..Thanks Chris and david

[@mikkio5371]

i have to come back and watch this . nice Chris . practically explained

[@KhurramSSiddiqui]

I opened this video a couple of days ago and finally came to watch it over the weekend. Great video, awesome presenters!

[@jm-nn4fz]

Cris and David you are real educators and no starch material on this channel 👌

[@shilpagethe7734]

I recently started my journey with wireshark indepth... came across this session and would like to thank you both for explaining tcp handshake with so ease and detailed !!

[@samhull8028]

Spot on, there is so much info to take in, will need a few repeats, but loved the indepth walkthrough, really helps to understand. Chris's enthusiam is brilliant, you kept the pace managable, like slowing to 10base from Chris's 1000base. lol thanks

[@JMalikZ]

Never seen someone dissect TCP handshake like this. Amazing!

[@StanMY-L0]

as a dual CCIE i still find this very useful and informative. recommended it to everyone in my team.

[@PST_1414]

what a brilliant way to teach TCP.. i am at 32:46 but till now i can say that i have learnt a lot in this video about protocol working, sequence numbers, wireshark filter setup etc. etc. I really like combination of these two persons. A very impressive tech talk regarding networking protocol.. Great video.. #TCP/IPDeepDive

[@madusankasampathweerasingh8570]

I cannot believe that I watched the whole video without skipping! Superb explanation!

[@samahhabib18300]

i watched the video on pluralsight explaining the tcp, and i think this is the most simplified explanation, the questions from David make the difference. and expiations from Chris were great. thank you all.

[@powellthepog5624]

The explanation for the sequence number (raw) was a life saver!

[@obscureclouds8392]

I'm mainly a developer with little to no network background. But this really helps. And i love the way you both interact with each other to make it even more understandable. Heck i really put out my notepad and wrote some of the things down to learn this properly. Thank you both very much.

[@siegfredcamallere4784]

same

[@kirannolan]

I have followed chris for long time , best instructor in TCP !!!

[@ged4440]

David and Chris, this is fantastic. I have watched so many presenters to learn this stuff and Chris, you are amazing in the way you teach it!

[@dhughes19962009]

I took a course that walked me through tcp among other things, but i didnt understand the importance and utility of it till watching this video. I very much appreciate the knowledge. Thank you both for your generosity in sharing with us all.

[@wasid7678]

you never disappoint your students David neither with your tutorials nor with your guests .. Keep doing this awesome work _V_

[@paulifea7072]

Great video and great explanation by both parties, like all other commenters have mentioned is a really valuable discussion. From the window scaling factor provided by the server (512), I assumed that all packets sent from the client to the server and vice versa would stick to the window scaling size of 512. But from inspection in the provided pcap file, the client remained the window scaling size of 64 (as indicated in the options header of the client SYN packet) while the server continues to send packets with the scaling factor of 512. Hope this clarifies anyone's doubts on the window scaling size of both client and server. Both of you have been so resourceful I'm so happy for this series.

[@yvesinformel221]

2 of the best guys on the same channel. super I used to whatch a lot of videos from both of them when I went back to school (at age 58!) .

[@shannon1573]

Thank you! Thank you! Thank you, David and Chris! I'm currently taking a college TCP/IP course & I think I've learned more in the last hour than I have in the last month! Our textbook is the TCP/IP Illustrated (2012) & although I I'm blown away by the technical details, I barely understand any of it. I also spend an ungodly amount of time researching what's still relevant. I've used Wireshark many times, but this video helped me UNDERSTAND it. TCP/IP is a prerequisite for my future Firewalls/Network security, OS Security & Routers classes, so I'm grateful for these videos to help me learn such a daunting subject. Please keep this series going!

[@stuartwill1992]

This is fantastic content, hearing the real life context of this system TCP/IP and the deep dive into how it works is great!

[@gtsui87]

Absolutely love this content. Most content that are on the web that pertains to tcp are explained in a very complex way. I love how Chris makes this very dumb down for the average person looking to learn tcp. Please continue this series as its very interesting and provides invaluable knowledge.

[@ChrisGreer]

I try to explain the way my brain processes things - so I gotta keep it simple! :-)

[@willd9807]

This is the most valuable video i have found on youtube or anywhere regarding packet sending. The only way it could be extended more is how the actual wire (or photo optic) is transferred from point to point. This video is priceless and belongs in Universities as a compulsory IT or Comp Sci must watch

[@maheshsudarsi82]

many training institutes are not not teaching these underlying concepts. Great work and thank you...

[@dwaynesudduth1028]

The TCP RFC was published the year I graduated High School... Absolutely LOVE LOVE LOVE this video. I can't wait for more! I've been working in IT most of my adult life---and I need to take things to the next level..I might be 58--but I really feel I have a decade or more to contribute.

[@dopiaza2006]

Are you worried that networking is rapidly moving towards the 'networking as a service' model in which indivdual network engineers will become far less required as the service providers will only keep a few high level engineers and use low skilled people to do what used to be network engineer tasks? I'm 10 years younger than you and worry a lot that 'traditional' network engineer jobs will run dry in 5 years or less?

[@dwaynesudduth1028]

@@dopiaza2006 to a degree, yes. The Network as a Service Model is already invading the small-medium sized business market, reducing the need for in-house network engineers or even consultants. However, where I see growth is in the wireless segment...that and in Security Ops.

[@juanrebella2589]

Absolutely amazing masterclass. Thank you Chris and David, superb material. Juan.

[@teomcam]

Wow what an episode. I can’t think of a word to thank you both enough for the treasure you giving us.

[@majiddehbi9186]

thx Mr. Bombal you said that u will bring Chris again, your a man of your word I asked u to bring Chris again and u did it thx guys both of you, and God bless u( make it monthly ) Big respect from Algiers

[@davidbombal]

Thank you! Definitely going to be creating more content with Chris 😀

[@Johno3998]

Man, the concept of "splitting the OSI model in half" to troubleshoot is such a good one, I've never thought of that

[@MiguelVargas-f9d]

Very well spoken Chris. I know close to nothing and I was understanding what was going on!

[@Jason.Detrick]

I'm studying for my CCNA and I need all the help and insight I can get for each of the layers of the OSI / TCP model. Learning about the handshake and the behind the scenes down into the raw numbers and why the packets are what they are and how each client frames up the numbers is great, so thank you! I'd love as much real life troubleshooting as I can get, down to why each possible problem might end up showing itself. It can be overwhelming for sure and just reading about it can be so dry it's hard to hold the knowledge but with video examples like this I believe it will help a lot.

[@oscardotel3787]

this is the most beautiful video i’ve ever run into on youtube. wow. thank you thank you thank you

[@rhinners3407]

Love the practicality side of this... Why are these numbers important, and how to use them to troubleshoot. How and Why!

[@tz2014]

Awesome, it is even more interesting when David fires up some questions to help us understand the concepts well. Chris really knows his stuffs

[@Addy580]

This really made my 1 hour journey back to home from office fun, thanks 🙏

[@samanthamorris3453]

Thanks for the video! In my professional life, one of the things that has really distinguished my more senior colleagues is their ability to understand TCP/UDP flows during troubleshooting. This video really helped me get an idea of what their brains may be thinking when we troubleshoot together! This is a video I'll watch multiple times.

[@petrooz1]

You guys are great, the nitty gritty of TCP just came out, we want more including UDP.

[@ausafahmad8335]

Hey David, This video was just awesome. I am currently studying medicine but I've always been interested in computers. Once I'm done with med school I'm going to start with a computer science course and your videos keep my interest ignited. Thanks a lot !

[@drumaddict89]

about 5 minutes in and LOVE how he describes and teaches stuff. thanks for your videos david! always a pleasure to expand my horizon with your content

[@arorarachit]

hey david, awesome stuff. cant wait for this we need the continuation of this series!!

[@bsparky01]

I know this is a two month old video, but I just wanted to thank you and Chris for putting this information out there. I have learned a lot from watching Chris' Wireshark videos, but this has been very educational as to why I am seeing what I see in the captures. I am not a network engineer/admin, but I end up spending a lot of time at work having to analyze network traffic because the application I support for my company is very latency sensitive and videos like these help me speak a common language with network folks to help get to the root of a complications. Thanks again for this and I am eager to dive into more!

[@MrKarimoRien]

It's been a long time since i have seen such an instructive video on TCP....You guys rock !!! Crystal clear and straightforward !!! Brillliiannnt !

[@davidbombal]

Thank you! Glad you enjoyed the video!

[@daniellauck9565]

This video should be watched at least three times to get every detail and explanion! Well done!!!! Gongrats!

[@robertwoodson227]

One of the best videos I have seen. Beautifully explained

[@nahleaky586]

This was a great overview of the TCP/IP part of a networking class I took in university. Well done!

[@tylerroman6065]

Absolutely loved the video! I'm currently doing research on Multi-path TCP so its amazing to have better understanding of TCP! Thank you!

[@ricksanchez9669]

That was awesome! The best tcp explanation ive ever seen hands down.

[@andydufresne9387]

The best network guide I've ever seen!

[@erezcohenbox]

Thank you for letting me listen to your conversation! I have learned a lot. Great job.

[@chandramohanr2000]

This is a great session!! Got a lot of insights around the TCP. Thanks David for arranging this session!!

[@meinetub]

One of the best series on the channel

[@HongeraGideon]

10minutes into the video and there is alot of valuable info I already got.

[@nilesh.mohekar]

I once was asked about the tcp flags during an interview which I couldn't quite answer, now I have learned about them :) Thanks for the great content!!

[@sunilkalekar4677]

Great to see a colabration video with 2 experts form the world of network.

[@MLX1401]

Just getting into networking and found this indepth video extremely interesting 😊

[@dravidianChief]

1hr well spent. Thank you guys. Definitely need a series. Nailed the basics of TCP/IP. Thank you!

[@3232groundhog]

Wow, I’m 3 1/2 minutes in and this is already looking… a. *Interesting* and b. *Important* in terms of a troubleshooting approach. Good stuff!

[@davidbombal]

Really happy to hear that! 😀

[@positivemind33]

I’m doing my ccna security this really helps a lot thank you

[@SantoshBansodeSB]

Dude this is best explanation i ever got, I appreciate your work.

[@jonathanpumida4685]

Great job Chris and David, just sending appreciation to you guys!

[@juliopaiz4951]

I'm starting my studies in CCNA and I have been following you for a while, a lot of things I still don't understand but, I woul not miss the chance to continue to watch these videos. I'm enjoying my learning process, thank you both.

[@davidbombal]

Thank you, Julio! I really appreciate that!

[@valterpereiracjr]

You rock @David and Chris is great. You too are amazing. Looking forward to watching the next video and learning a lot from you. Thank you both.

[@tonyhoy4688]

An hour very well spent. Thanks chaps.

[@yggdrasil6787]

As a french student, I would like to thank you for providing me with a way to both improve my English listening skill and my general IT knowledge 😁 Keep it up!

[@gaborkomuves6768]

Hi guys! The funny thing I'm a BAS engineer and some BAS (Building Automation Systems) networks are managed by the IT department (IT networks) I know a site that looks to have network issues. I'm one of the BAS guys who say I have no trust in the IT department ....and the BAS devices disconnecting during some sessions could be caused by Network Management settings. Good work David ..I'm falowing you

[@nikolaborkowski9942]

Hi, David! To be honest i found your CHannel by chance, and i think i am lucky. David, i am just little modest simple man, but if you would read this i wish you and all your relatives Health and Wealth, you content is always helpful and usefull for me! Thank you, man!

[@davidbombal]

Thank you Nikola!

[@lennyaltamura2009]

A lot of IT guys say you don't need college. This is the kind of stuff you learn in college. College does very much add to the richness of information used in all aspects of IT. I would just like to thank you so much for sharing, it was a wonderful recap.

[@Phasma6969]

You can learn this without college... Read more...

[@lennyaltamura2009]

@@Phasma6969, I agree. Reading is essential.

[@Phasma6969]

@@lennyaltamura2009 We love to hear it. Wikipedia happens to actually have good information on IT topics that are purely engineering oriented like IEEE specifications and standards.

[@pedrocosta8846]

wow! i wish UNIs had teachers explaining subjects like this! Thank you

[@davidbombal]

Glad you enjoyed the video Pedro!

[@raos2405]

This is a unique deep dive! please continue this series

[@lakiluci474]

I decided to not watch this Video when i saw it's too lengthy , but today, due to some Un-stable situation in Africa , i got off from my Work, & Watched the Video , it really helped me

[@robertprice7459]

Brilliant explanation by Chris, big thank you to Chris and David. Can't wait for the next instalment

[@andriejusartamonovas1857]

so simple, so clearly explained, yet so hard to digest... I guess I've found something I will enjoy grinding on! thank you!

[@Visualicon]

This is Great!! I used to have my CCNA way back and was never taught in this deep about TCP/IP aside from SYN/ACK and Sliding window. along with Latency it really makes more sense how payload is transferred and the TCP issues that can some along with it.

[@vijethpatil3044]

I didn't even lose you for one sec from starting. Great session with basic things about TCP thank you, David and Chris

[@maciejwakula8857]

Great! It took me 3 months of attempts to set up my own firewall until I noticed TTL=1 set by my internet provider 20-25 years ago.... Also 3 months of tcpdump and heavy learning. And I never had a chance to go through ALL the headers/options (not mentioning more fancy stuff). Thanks for a really nice material (though sometimes it could be maybe a tiny bit shorter...)

[@latchkeylex]

Making it real world and showing how networking truly works is the only way to comprehend this material. I don't care how good the course is. If they're not popping the hood open to show you what's REALLY happening, it honestly difficult to understand. Great video, thank you