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TCP Windows scaling is a setting per TCP connection. Thus not shared, but multiple TCP connection can of course have the same setting.

Scaling is only used if both sides uses that option in the SYN segment. See RFC 7323 Window Scale Option

Assuming that is the case, the memory allocated for that connection is 64K * 4 for the send and receive window in your example.

TCP Windows scaling is a setting per TCP connection. Thus not shared, but multiple TCP connection connections can of course have the same setting.

Scaling is only used if both sides uses that option in the SYN segment. See RFC 7323 Window Scale Option

Assuming that is the case, the memory allocated for that connection is 64K * 4 for the send and receive window in your example.