TCP window scale option

From Wikipedia, the free encyclopedia

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.