TCP Modification

TCP Solution

Intuitively, the TCP solution is to modify client side of the TCP connections so that when the client side has completed a passive close of a transport connection, it sends out a RST packet to the server and put itself into a TIME_WAIT state. The RST packet removes the TCB in TIME_WAIT state from the server. Just like:


      server                            client
      -----------------------------------------------------------
      ESTABLISHED                       ESTABLISHED
      (get application close)
      goto FIN_WAIT_1
      send FIN           ---FIN--->
                                        goto CLOSE_WAIT
                        <---ACK---      send ACK
      goto FIN_WAIT_2
                                        (get application close_swap)
                                        goto LAST_ACK_SWAP
                        <---FIN---      send FIN
      goto TIME_WAIT
      send ACK           ---ACK--->
                                        goto TIME_WAIT
                        <---RST---      send RST
      goto CLOSED

Experiments show that this solution have great performance enhancement at a busy server.

Measurement

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Last modified July 11, 1997.