RTT = > Round Trip Time between Client and Server.Now the TCP communication is established and able to exchange dataĭuring the 3-Way-Handshake there is a lot of useful information exchanged between Client and Server.īeside of Source IP, Destination IP, Source Port, Destination Port, Source MAC, Destination MAC you can also get:.The Client acknowledge (ACK) the SYN packet (from the Server).The Server acknowledge (ACK) the SYN packet (from the Client) and send its own SYN packet with its Initial Sequence Number. ![]() The Client sends a SYN packet with its Initial Sequence Number to the Server.Here a short recap of how the handshake looks like: ![]() The 3-Way-Handshake is the most important step in TCP to establish a communication between client and server. Get first Information from the 3-Way-Handshake
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