Two half open connections with same source port and dest port.

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In kernel 2.2.13:

When a TCP connection request come in, kernel alloc a req in the listen
socket.
When a new connection request come in( with same source/dest port ):
1. kernel found the original request struct in listen socket
2. compre the ini sequence with the previous one, if equal,
   then the retransmited request.
   BUT if not equal, kernel think it a new request, and alloc a new
   req struct in listen socket. ( tcp_input.c, tcp_check_req() )
   NOW TWO HALF OPEN CONNECTIONS WITH SAME SOURCE/DEST PORT.

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