TCP Flow Control

receiver: explicitly informs sender of (dynamically changing) amount of free buffer space

• RcvWindow field in TCP segment

sender: keeps the amount of transmitted, unACKed data less than most recently received RcvWindow

sender won’t overrun

receiver’s buffers by

transmitting too much,

too fast

receiver buffering

RcvBuffer = size or TCP Receive Buffer

RcvWindow = amount of spare room in Buffer

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