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By which of the following methods Wireshark detects TCP Retransmissions?

asked 2020-10-09 12:49:27 +0000

hopcount gravatar image

updated 2020-10-09 13:03:50 +0000

grahamb gravatar image

By which of the following methods Wireshark detects TCP Retransmissions?

  1. Sequence and Acknowledgement Numbers
  2. Windows Size Shifts
  3. Delta Time Delays
  4. Hop Counts

Note:kindly provide the answer with the appropriate explanation. Thank You.

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Presumably this is some sort of classwork, what do you think it is?

grahamb gravatar imagegrahamb ( 2020-10-09 13:04:12 +0000 )edit

Option 5 : It goes to Ask Wireshark and asks it to do it's homework for them.

hugo.vanderkooij gravatar imagehugo.vanderkooij ( 2020-10-09 13:18:40 +0000 )edit

No, I've just framed it as a mcq type of Q for trimming ambiguities. I just wanted to know how WS works with TCP packets and re-transmissions. Would it be possible for you to give an explanation on any one of those options?

hopcount gravatar imagehopcount ( 2020-10-09 13:20:35 +0000 )edit

Can you atleast comment about how? WS determines a tcp packet's priority? Does windows size determine these sequences?

hopcount gravatar imagehopcount ( 2020-10-09 13:30:12 +0000 )edit

You seem to be adding a supplementary question there about "priority"?

grahamb gravatar imagegrahamb ( 2020-10-09 13:32:39 +0000 )edit

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answered 2020-10-09 13:35:40 +0000

grahamb gravatar image

As per the TCP RFC 793 retransmissions are detected by comparing sequence numbers and looking for overlaps with those already received (or in Wireshark's case a previous packet in the stream).

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about "priority" after comparing sequence of numbers, if windows scaling is enabled then what happens

hopcount gravatar imagehopcount ( 2020-10-09 13:54:17 +0000 )edit

Scaling has nothing to do with detecting retransmissions, it's all down to overlapping sequence numbers.

grahamb gravatar imagegrahamb ( 2020-10-09 14:42:36 +0000 )edit

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Asked: 2020-10-09 12:49:27 +0000

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Last updated: Oct 09 '20