TCP window scale option
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The TCP window scale option is an option to increase the TCP congestion window size above its maximum value of 65,536 bytes. It is defined in IETF [RFC 1323]. The congestion window size may be increased up to a maximum value of 1 gibibyte (1,073,741,824 bytes). This is done by specifying a one byte shift count in the header options field. The true congestion window size is left shifted by the value in shift count. A maximum value of 14 may be used for the shift count value.
