This is our old Q&A Site. Please post any new questions and answers at

Hello, i am doing some tests to observ the behavior of ack clocking in tcp. i understand that there are many reasons that affect ack clocking such as the presence of bottleneck and the presence of delayed ack , but i do not understand why or WHEN exactly it is affected, can anyone explain that to me ??

asked 12 Jul '15, 04:56

yas1234's gravatar image

accept rate: 0%

This question is difficult to understand but i think I would suggest you read / watch:

Probably paying special attention to Flow and Congestion control. I may get shot for this, but I also found this page useful as it explains things fairly simply:

AFTER reading these pages at least, you should watch this video:

And now you should understand ACK Clocking and flow control. The basic answer is: pretty much always when more than one link type / speed is in use.

permanent link

answered 12 Jul '15, 15:32

DarrenWright's gravatar image

accept rate: 26%

i do understand ack clocking ..but this is all theory.. my problem is when comparing theory to what happens in reality it is different ...i need to know this difference why is it caused or at least when it is caused..any help

(12 Jul '15, 15:49) yas1234

It would certainly help if you provide a packet capture that shows the scenario that you want explained. Can you upload an example to ?

(12 Jul '15, 22:18) mrEEde
Your answer
toggle preview

Follow this question

By Email:

Once you sign in you will be able to subscribe for any updates here



Answers and Comments

Markdown Basics

  • *italic* or _italic_
  • **bold** or __bold__
  • link:[text]( "title")
  • image?![alt text](/path/img.jpg "title")
  • numbered list: 1. Foo 2. Bar
  • to add a line break simply add two spaces to where you would like the new line to be.
  • basic HTML tags are also supported

Question tags:


question asked: 12 Jul '15, 04:56

question was seen: 2,442 times

last updated: 12 Jul '15, 22:18

p​o​w​e​r​e​d by O​S​Q​A