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readme: wssize setting rules

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bol-van
2021-03-19 16:04:15 +03:00
parent 4ff55ad7f5
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docs/readme.eng.txt
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@@ -285,6 +285,9 @@ scaling factor is the power of two by which the window size is multiplied : 0=>1
The wssize parameter specifies the scaling factor after a colon.
Scaling factor can only decrease, increase is blocked to prevent the server from exceeding client's window size.
To force a TLS server to fragment ServerHello message to avoid hostname detection on DPI use --wssize=1:6
The main rule is to set scale_factor as much as possible so that after recovery the final window size
becomes the possible maximum. If you set scale_factor 64:0, it will be very slow.
On the other hand, the server response must not be large enough for the DPI to find what it is looking for.
Hostlist filter does not affect --wssize because it works since the connection initiation when it's not yet possible
to extract the host name.