(not considering TCP window here, or there might be more packets from one end before the acknoledgement)ĪCK Flag, acknowledgement number and the procedure of acknowledgement are related but not the same thing.Īcknowledgment Number: 32 bits If the ACK control bit is set this field contains the value of the It does not need to be and can't be acknowledged.Ī ->B Syn=x+z, Ack=y+o, len=p, ACK Flagī ->A Syn=y+o, ACK=x+z+p,len=q, RST, ACK Flagī closes the socket after it sends the last packet and A closes the socket after it receives it. When one side sends RST, the socket is closed immediately and the receiving side also closes the socket immediately after receiving valid RST. Once the connection is established, all packets need to have ACK set and match the sequence number of the received packets for reliable transport/security.
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