Setting TCP’s RTX Timers

• Slow-start is invoked as a result of a timer expiring (resetting the world)

• Recall we need some way of setting this timer, but TCP must work both in local as well as very long delay environments

• Need a way to set the timer based on the connection’s round-trip time:

  • how to measure the RTT?
  • how to set the RTX timer based on this?

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