TCP Bulk Data Flow (Contd)
- End-to-end flow control
- Window update acks: receiver ready
- Default buffer sizes: 4096 to 16384 bytes.
- Ideal: window and receiver buffer = bandwidth-delay product
TCP window terminology: figs 20.4, 20.5, 20.6
- Right edge, Left edge, usable window
- “closes” => left edge (snd_una) advances
- “opens” => right edge advances (receiver buffer freed => receiver window increases)
- “shrinks” => right edge moves to left (rare)