Congestion Window, 3 dup ACK, Timeout and why it matters!

[@Stuepp]

You explained it in such a good and simple way, it was so clear! Really thank you.

[@kelcamer]

Thank you so much for watching! I'm glad to have helped you 😊

[@shubhamaaws]

It really helped me in understanding the graph night before exam.... Thanks!!!

[@kelcamer]

Thanks 😊

[@abhidhanani]

Simple, nicely explained with examples and different scenarios. Thank you 😊

[@kelcamer]

Thank you so much! 😊

[@somyadeepshrivastava1447]

it was to the point congestion control explaination, which other tutorials hardly provide. keep it up!!👌

[@kelcamer]

Thanks!

[@joeyjoseph3985]

It's a very nice and simple explanation of the topic, hope u wud do more of such wireshark and networking videos...Take care 👍

[@vipulv07]

A good piece of information. Nice research done. Keep it up!

[@kelcamer]

Thanks so much! Glad you like it :)

[@kelechirowland2237]

very informative and precise

[@netcat22]

Thank you! this helped a lot!

[@kelcamer]

You are so welcome 😊 feel free to reach out if you have any questions!

[@hagaryulevich2675]

Amazing

[@jihenluv6905]

Thank youuuuuuuuu , this helped alot

[@mixmix862]

these are super helpful

[@千里之行-z5r]

Thank you :)

[@tuongnguyen9391]

This is so good !

[@kelcamer]

Glad you like it!

[@ki_9259]

i like this kand of video to explain briefly, but in uni lecturer never teach like this...

[@kelcamer]

@@ki_9259 I wish they did! Hahaha.

[@zc3083]

Very clearly explained! Thanks for the video posting! I have a question that when the server host sends 3 duplicated ACK, are these sent simultaneously, or are these sent one after another and takes 3 RTTs? This part always confuses me. Thank you!

[@kelcamer]

Hey! Sorry, I just saw this comment. So every time an ACK is sent again, it should be equal to 1 RTT. So if you get 3 duplicate ACKS, that would be 3 RTT

[@kelcamer]

Basically, the duplicate ACK is sent because a packet was dropped somewhere so the ACK was never actually incremented, and therefore the system would keep trying to send the data (and keep trying to avoid duplicate ACKs). Usually when you see a lot of duplicate ACK it can be a sign of high interference in a network.

[@claay832]

Hi Kelsey. Does TCP slow start often signify a new connection. Does new connections behave in TCP Slow start?

[@kelcamer]

I'm not sure I completely understand your question, but TCP slow start means that at the start of the connection, the congestion window exponentially increases 😊 if there is any packet loss, it then cuts in half, then enters congestion avoidance mode.

[@claay832]

@@kelcamer does TCP slow start always happens everytime a connection starts?

[@claay832]

Could you do a video about CWR and ECN flags.

[@kelcamer]

@@claay832 yes, if it is a new connection

[@claay832]

@@kelcamer you're HOT!..

[@omarelesaily2091]

that is actually pretty good ,but what happens when it hits a number that is not a divisor of '2' at the 3 duplicate acks situation ,EX: my CWND=13 and there happens a 3 duplicate acks which starts a fast transmission so ,here in this situation should I start from ceil 13/2 or floor 13/2,thx in advance

[@kelcamer]

Typically after a 3 dup ack occurs, you'd want to be as conservative as possible with increasing the congestion window because you're unsure about how much the network can handle. That being said, I think taking the floor would be the conservative route. So yours should be 13/2 = 6.

[@kracksmith4ejm1]

where do you plan to make these adjustments?

[@kelcamer]

Which adjustments?

[@jeankmeow4422]

How do you measure the CW? Is it taken from ping's cwnd properties?

[@kelcamer]

I would say it entirely depends on the network. What type of network are you using? Also, at the beginning of the network, usually the congestion Window starts at 1 and increases from there. However, every network is different, so it really depends on your application.

[@RobertoSilva-hj9yn]

One question, this method to control the congestion window is independent of the congestion control? (Cubic, New Reno, Hybla....)

[@kelcamer]

Yes, I believe those are different congestion control methods. 👍

[@claay832]

you don't say.. hmmm

[@zeroone4597]

Is it the thing that... TCP compulsorily uses ACK timer ... For cumulative ack?

[@kelcamer]

I'm not sure about the protocol specifics but a timer would absolutely have the same effect 👍

[@claay832]

@@kelcamer I also have the same idea since I saw your video on TCP window and Acknowledgements. It was great.

[@kelcamer]

@@claay832 thank you!

[@universeboss4865]

@@kelcamer Okay

[@hashanulbasharsiam6795]

You should draw the graph fully

[@yugaprs]

sexy voice

[@zeroone4597]

Stupid

[@Time_Kad_K]

Chup kar

[@kelcamer]

Muhammad Ahmed what?