Tcp – Wireshark TCP and window size

protocol-theorytcpwireshark

Can please someone explain me on the below screenshot why host 192.168.1.200 on packet 9 sends an ACK for the packets 6 – 7 – 8? The total packet size does not correspond to the window size agreed. If I understood it correctly the window size is the amount o data that a device can send without acknowledging.

Thank you

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Best Answer

Can please someone explain me on the below screenshot why host 192.168.1.200 on packet 9 sends an ACK for the packets 6 - 7 - 8? The total packet size does not correspond to the window size agreed. If I understood it correctly the window size is the amount o data that a device can send without acknowledging.

The window size is the maximum amount of unacknowledged data that can be outstanding in a socket; however, there is no requirement to fill this window before ACK-ing. In fact, most low-latency connections do not fill the window because stations acknowledge data so quickly. What you are seeing is normal, there is no problem.

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