Windows Scaling

answered 2020-07-20 19:40:14 +0000

Chuckc
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updated 2020-07-20 19:45:23 +0000

Request for Comments: 1323 TCP Extensions for High Performance

 This option is an offer, not a promise; both sides must send
 Window Scale options in their SYN segments to enable window
 scaling in either direction.

Article with graphs here mentions that setting the scale factor to 1 (2^0) allows it to be "supported" without having to allocate extra memory.

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This is why sometimes you will see one side of the connection (usually whoever is sending the bulk of the data) offer the Window Scale option, but use a scale factor of 0. This means "Hey, I am offering this option so that you can use your window scale on your side, but I'm not going to use a multiplier on my end. You can, but I'm just going to let my advertised window be what it is."

But if both sides don't offer, then the option cannot be used as ChuckC mentioned.

ctgreer ( 2020-07-22 16:20:25 +0000 )edit

Chuckc

Thank you for your response, and the link to the Cloudshark article.

"Window Scaling only works if both sides include it as an option during the initial 3-way handshake (even if their multipliers are different). "

Bruce

BruceO ( 2020-07-22 22:47:52 +0000 )edit

@BruceO, if an answer has solved your issue, for the benefit of others who may have the same question, please accept it by clicking the checkmark to the left of the answer.

grahamb ( 2020-07-23 08:08:33 +0000 )edit

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