Hello Laz,
I have done some experiment where I was downloading some file from a site. Pretty much everything is clear to me so far. However, couple more questions have popped up. I am going to refer to the below screenshots for my questions.
<img
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If we look at the first highlighted line in yellow, it has two fields, window size value and calculated window size. What are the differences between them?
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As we know, window size will keep on going up until the receiver is unable to handle all the packets sent by the sender. How do two hosts let each other know what the window size will be for the next transmission( set of segments)?
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If we look at the second highlighted line. It has two fields related to window size(window size value=11 and calculated window size=2816) and the acknowledgement of 10441937. I am not sure which one refers to the actual window size. What would be the window size 11 or 2816? However, after the second highlighted line, the sender has sent one packet of 1460 bytes to the receiver 192.168.1.9. Right after that, the receiver sent an acknowledgement to the sender of 10443397. So, that makes sense because 10443397-10441937= 1460 which is the payload, but that 1460 bytes does not match window size(11) and calculated window size(2816) either. Would you please explain it to me?
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Let’s say in a communication, two hosts have agreed upon a window size 400 bytes. Then the sender sent four packets to the receiver successfully. Isn’t the total of those four packets supposed to be 400 bytes?
window size 400 determined.
sender receiver
100 bytes-------------------------------->
100 bytes-------------------------------->
100 bytes-------------------------------->
100 bytes-------------------------------->
total of four packets =400 bytes
then the receiver will send an acknowledgement of 401. Am I correct?
Thank you so much for your endless help.
Azm