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QuickStart with TCP, for setting the initial window:
In an IP option in the SYN packet,
the sender's desired sending rate:
Routers on the path decrement a TTL counter,
and decrease the allowed sending rate, if necessary.
The receiver sends feedback to the sender in the SYN/ACK packet:
The sender knows if all routers on the path participated.
The sender has an RTT measurement.
The sender can set the initial congestion window.
The TCP sender continues using normal congestion control..
From an initial proposal by Amit Jain

PPT Version