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

Рет қаралды 657,055

Күн бұрын

You need to learn TCP/IP. It's so much part of our life. Doesn't matter if you are studying for cybersecurity, or networking or something else. Learn TCP/IP.
// 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/l5p8ofik86z...
// MY STUFF //
www.amazon.com/shop/davidbombal
// SOCIAL //
Discord: / discord
Twitter: / davidbombal
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LinkedIn: / davidbombal
Facebook: / davidbombal.co
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//CHRIS GREER //
LinkedIn: / cgreer
KZfaq: / chrisgreer
Twitter: / packetpioneer
Pluralsight: TCP Analysis Course: davidbombal.wiki/tcpwireshark
// SPONSORS //
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#wireshark #tcp #hacking

Пікірлер: 802

@haphamdev Жыл бұрын

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 Жыл бұрын

sounds like you didn’t pay attention in university

@HungNguyen-zx5zf 9 ай бұрын

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

@anonShrivastav 7 ай бұрын

@@saucegotti8538😂

@mwafulirwa1 5 ай бұрын

@@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 3 ай бұрын

😅😅😅😅😂😂😂😂🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣 Madman

@Jarek. 2 жыл бұрын

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

@davidbombal 2 жыл бұрын

Glad you enjoyed it! 😀

@JeremysITLab 2 жыл бұрын

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

@davidbombal 2 жыл бұрын

Thanks Jeremy! Great to see you here again 😀

@junaidjaved4792 2 жыл бұрын

Jeremys IT lab sir 😍😍😍😍😍❤❤❤❤

@nevarius9010 2 жыл бұрын

The GOAT

@aaqibshafiq5468 2 жыл бұрын

Please add some topics :-dhcp/dns/arp

@evanstayuka381 2 жыл бұрын

Jeremy IT Lab, Sir your lessons are gold

@ZeyRonTT 2 жыл бұрын

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

@phil2768 5 ай бұрын

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 👌🏻

@CFH298 2 жыл бұрын

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 2 жыл бұрын

Here you go: kzfaq.info/sun/PLhfrWIlLOoKO8522T1OAhR5Bb2mD6Qy_l

@CFH298 2 жыл бұрын

@@davidbombal You’re the best :)

@SiddhantSwami 2 жыл бұрын

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

@AshleyEhSMR Жыл бұрын

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

@simplekindofman8867 5 ай бұрын

This is so incredibly thorough. Great job!!

@thecuriousengineer 2 жыл бұрын

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

@davidbombal 2 жыл бұрын

// 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 KZfaq: kzfaq.info //CHRIS GREER // LinkedIn: www.linkedin.com/in/cgreer/ KZfaq: kzfaq.info Twitter: twitter.com/packetpioneer Pluralsight: TCP Analysis Course: davidbombal.wiki/tcpwireshark // SPONSORS // Interested in sponsoring my videos? Reach out to my team here: sponsors@davidbombal.com 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 2 жыл бұрын

EXCELLENT

@joelhorensma8036 2 жыл бұрын

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

@TampaRedd 2 жыл бұрын

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

@vicdan90 2 жыл бұрын

@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.

@CyberNancy 2 жыл бұрын

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

@confidential303 2 жыл бұрын

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

@klwthe3rd 2 жыл бұрын

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 KZfaq. I would like to see common problems/solutions that occur often in the real world where Chris would be called out for diagnosis.

@northblue8216 2 жыл бұрын

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

@IMAND93 Жыл бұрын

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.

@nuxboxen 2 жыл бұрын

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.

@partspieces8165 Жыл бұрын

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!

@kapilsonyt 2 жыл бұрын

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 2 жыл бұрын

Thank you and you're welcome!

@ChrisGreer 2 жыл бұрын

Thanks Kapil! Great to meet you.

@foi50 4 күн бұрын

hello there, i'm from france and your video motivates me to become a great network engineer thank you sm

@MSSMusChaos 2 жыл бұрын

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

@jean-ericrioux4726 2 жыл бұрын

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 !

@educastellini 2 жыл бұрын

-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...!!!

@webplethora Жыл бұрын

Thank you David and Chris for this fanstastic session. These sessions are really empowering and the in-depth knowledge that is imparted through this video is enlightening. I am truly grateful for this. Once again, thank you David and Chris.

@stuartwill1992 2 жыл бұрын

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

@drumaddict89 Жыл бұрын

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

@bsparky01 2 жыл бұрын

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!

@wiltonwell 2 жыл бұрын

Thank you Chris and David you took me on learning trip with, there all the way. I have learnt from the best and you deserve more than I can give you both. I will continue watching your content, for me achieve my goal. It is people like you that are unsung heros of people for me that is trying my best to get there.

@teomcam 2 жыл бұрын

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

@greob 2 жыл бұрын

Another GREAT video! Love this series and love Chris, such a great teacher. Would love to see more about QUIC and UDP as well.

@shannon1573 2 жыл бұрын

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!

@jonathantx 2 жыл бұрын

Thank you for making kind of knowledge available to everyone. This really makes a difference when your new and starting to put things together in your mind and breaking out doing tasks on your own in a production network.

@sureshjoshi5933 2 жыл бұрын

You guys are incredible! I've been looking for videos like this for a long time. Attaching the pcap file is a great idea so that person can follow along with your flow!

@samanthamorris3453 2 жыл бұрын

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.

@gaborkomuves6768 Жыл бұрын

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

@themistoclesnelson2163 2 жыл бұрын

Enjoyed the deep dive. Came for the window, but watched the whole thing.

@ricardow1130 2 жыл бұрын

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!

@Johno3998 Жыл бұрын

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

@maheshsudarsi82 Жыл бұрын

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

@ok-jq1jh 2 жыл бұрын

THANK YOU! Finally what I've been seeing in tcp packets makes much more sense thanks to you guys. I do appreciate it, definitely love the deep dives keep it up!

@KhurramSSiddiqui 2 жыл бұрын

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

@dravidianChief 2 жыл бұрын

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

@maciejwakula8857 Жыл бұрын

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...)

@CrashLoopBackOff-K8s 2 жыл бұрын

Adding a comment and like for the algorithm. I also subscribed to Chris. Great conversation and examples. More of this, please. As a reminder, your audience not only includes those just beginning their networking careers, but also those like myself who are professionals in other areas and need to pick up enough skills to be competent in some of the areas you focus on. Your content is appreciated, David.

@JudgeGideon823 2 жыл бұрын

Love this practical knowledge. I am convinced, or rather confident that my career will be significantly more enjoyable and valuable if I understand Networking like you gentlemen. Like anything we don't know, it can be confusing and challenging, but once we pass those hurdles it's incredibly satisfying and worthwhile. Thank you David for what you do and for introducing us to some great people and professionals. Absolutely invaluable stuff here.

@ausafahmad8335 2 жыл бұрын

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 !

@deenarshahid 2 жыл бұрын

It's been amazing experience watching two of you explaining TCP basics in wonderful way. Would like to see you both covering TLS as well. Fingers crossed 🤞

@juanrebella2589 Жыл бұрын

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

@samratchapagain4804 2 жыл бұрын

Loving the way he explains the TCP like the real world examples. Eager to wait for another episode like problem of window scale size and many more. Thanks david and chris :)

@samahhabib18300 2 жыл бұрын

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.

@ged4440 2 ай бұрын

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!

@lakiluci474 2 жыл бұрын

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

@samhull8028 2 ай бұрын

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

@noevaz Жыл бұрын

I saw this video a few months ago and I struggle a lot to understand, after reading some material and practicing I watched the video again and I really understand more about TCP, definitely you need to spend time and be PATIENT when learning this topics, great video David and Chris!

@erezcohenbox 10 ай бұрын

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

@willd9807 2 жыл бұрын

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

@charlesikpeme7777 2 жыл бұрын

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

@davidbombal 2 жыл бұрын

Thank you Charles!

@Zerback 2 жыл бұрын

Thank you very much for going at this level. You are helping a lot of people that just starting on the networking/ security side of computers. Please continue going deep with different types of protocols!

@petrooz1 2 жыл бұрын

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

@rakeshcristobal8320 2 жыл бұрын

Great detailed look into TCP with Chris! Looking forward to more videos with Chris!

@jindalabhishek1 2 жыл бұрын

Hey David and Chris, Thanks for sharing and giving back to the Community!!!. I will follow your path and share as much as I can

@tylerroman6065 6 ай бұрын

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

@kevinlong3147 2 жыл бұрын

Thank you so much David and Chris, this was very eloquently taught. I had a better time understanding here than my ccna classes.

@Sherloklol 2 жыл бұрын

This was some of the best tcp/wireshark education i've seen where you simply things so it's understood. well done and thank you

@chillarn7 2 жыл бұрын

Amazing video, learned a lot! It really helps seeing the packet captures to fully grasp the TCP concepts.

@dhughes19962009 Жыл бұрын

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.

@jacobhenriksen2324 2 жыл бұрын

Absolutely LOVE this! Can't wait for the rest of the series!

@arorarachit 2 жыл бұрын

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

@ajaykhanna1981 2 жыл бұрын

Awesome Stuff, so insightful !! Thanks Chris and David. I loved the way David keeps on countering Chris and Chris very calmly and brilliantly knocking it out of the park.

@mikkio5371 2 ай бұрын

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

@tomhartley5086 2 жыл бұрын

Awesome video David and Chris, your collaborative videos are awesome and very helpful!! MORE PLEASE :)

@Jason.Detrick 5 ай бұрын

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.

@andriejusartamonovas1857 2 жыл бұрын

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

@shokijames 2 жыл бұрын

Chris you explained everything so good that I went straight to your channel and subscribed. Thanks to both of you

@kshitijpatil4145 2 жыл бұрын

Thanks for the series David & Chris this deep dive session is really amazing, took 1 hour of my time but would love to utilize more than that for future deep dive episodes as it is really interesting to learn. Considering TCP would like to learn examples with TCP flags RST, PSH, URG also if we use NAT & PAT how the other TCP header info will affect for the actual source & destination systems.

@tz2014 8 ай бұрын

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

@chandramohanr2000 5 ай бұрын

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

@Shalom_Mike 2 жыл бұрын

Wow! Great video for non-network admins too. 😃 Can't wait for more! The subject matter was explained perfectly! Even I understood it!

@briteness9356 2 жыл бұрын

That "Packet Head" T-shirt is awesome!

@dushyantsinghshekhawat969 3 ай бұрын

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

@davidbombal 3 ай бұрын

Thank you!

@tomsgrinbergs8020 2 жыл бұрын

You definitely got to continue with this type of content, cheers Chris for this. Really good bunch of notes I've made on my side!!

@jm-nn4fz 6 ай бұрын

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

@cryptoknight5927 2 жыл бұрын

Thanks a lot for both you two David and Chris that's what we really want as it's a simplifying the heavy manual books information and move many student from beginner level to the top

@Visualicon Жыл бұрын

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.

@StanleyLoh 2 жыл бұрын

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

@deivids4221 2 жыл бұрын

What an amazing video. Thank you to both and I hope there will be more to come. This is very well explained and put together.

@oumadahmed4625 Жыл бұрын

Just discovered your channel and I’m so happy I did. Your work is a masterpiece

@robertprice7459 2 жыл бұрын

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

@sunilkalekar4677 2 жыл бұрын

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

@mrmike81818 2 жыл бұрын

Found a little gem with this video and I've never seen such a breakdown. Wireshark seems so much simpler now. I'm looking forward to taking networking to the next level with you guys, thanks!

@nahleaky586 Жыл бұрын

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

@paulifea7072 2 жыл бұрын

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.

@wasid7678 2 жыл бұрын

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

@mystay88 2 жыл бұрын

Thanks a lot for that video. Those kind of deep dive videos ares my preferred. Flow is perfect. Bravo! Catch you guys on the next one.

@gtsui87 2 жыл бұрын

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 2 жыл бұрын

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

@powellthepog5624 2 жыл бұрын

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

@chfstudio 2 жыл бұрын

Wow! Very clear and powerful explanation! Thank you for this lesson!

@pallavi8388 2 жыл бұрын

Thank you David, this is soo interesting and informative. Finally i got to know what happens in 3way handshake. Until now i just thought SYN SYN ACK ACK. Chris explains everything in such a detailed manner just love his explanation.