TCP Duplicate Acks Explained // How to Troubleshoot Them

In this video we are going to dive into TCP duplicate ACK analysis. In this hands-on video, make sure to download the pcap below so you can follow along.

----------Download the pcap here-----------

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Hope this helps Packet People! Please like, share, subscribe!

[jasperbongertz]

Dup ACKs also happen for out-of-order arrivals. It doesn't always have to be packet loss, just segments not arriving when they should have ;)

[JoshKuo]

Chris, thank you for making these videos, you explain complex concepts with such ease!

[HuzaifaGujjar]

I watch your videos to revise my concepts. Every content produced by you is pure gold.

[zahraadeli]

Dear Chris, thank you very vey much. You've got no idea how these training enlighten my way to network analysis. I'm a substation protection/control engineer working with IEC61850 trying to find a way to be able to troubleshoot what's going on when I didn't recieve a signal on dcs system.
And guess what, with the help of this channel I'm growing more and more everyday.
Good luck with what you're doing. You're awesome🙏

[tolgayucel]

Thank you for your videos. When is all about routing protocols there are lots of videos and documents online. On the other hand, if the topic is TCP, most of documents are same and not clear. You really making it simple. Knowing a knowledge does not matter, the most important factor is that you can teach in a simplest way.

[TheAddictioneer]

Thanks Chris. Your videos are very informative and digestuble. I’d appreciate it if you could make a video about tcp out of order.

[Practical-IT]

I'm enjoying these videos. It's got me diving back into WireShark again with a newfound appreciation after a bit of a hiatus. Thanks!

[parkyang]

Thank you Chris, learned so much from the video, Going to introduce it to the team, Days before, when someone in the team say will engage a network guy to give a wireshark training, all of us raised hands to be attending. indicate this knowledge is so precious. I am working for Microsoft.

[geist]

Chris love your content it is so powerful and is super helpful thank you please keep up the good work

[jakebenstade]

Today subscribe this channel and were talking about this topic with my buddy and you made it.... Great job sir.

[Black_Swan]

Thank you so much for sharing the video. Please make some video on how to find out why the traffic was denied/dropped or at least by the destination ip. I'm new to Wireshark and have no clue to figure that out.

[dmncstr]

Chris, your videos are really helpful. Excellent explanation.

[loveplanes]

Thanks Chris!!!! amazing.. I been in a problem for few days and your help has been amazing.

[franktoner]

Chris, thank you for helping me to better understand what I should be looking for in pcap traces

[v_luv_nature]

Great person and helpful videos i got a confidence on my knowledge after watching this videos.

[AssadNiang]

Excellent Chris!!!
I was seeing the same issue, now I understand
Well explained
Thank you!!!

[waelkaabi]

Good explanation, thank you Chris. One Question: it is possible to analyze in network traffic (TCP) the latency in Wireshark.

[minghongpi]

Thank you very much, it is the best video to learn wireshark and tcp

[m.adnankhan]

Thank you so much for your time and for making these videos. Much appreciated Chris.

[prasadshelar]

HI chris, can you create some video regarding TCP Half close and tcp half open and live example related it.