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The TCP Receive Window is way to low for you to fill that 1G circuit with such a high round trip time (RTT). You should be able to tune the TCP behaviour on the receiver to allow it to scale the Receive Window much higher than the 212992 bits that the receiver sets.

The optimum TCP Receive Window for a 1Gbps link with a RTT of 73msecs (as in your capture), the result is 9,125MB (Bandwidth in bits * RTT in seconds = Windows Size in bits / 8 = Window size in Bytes)

The TCP Receive Window is way to low for you to fill that 1G circuit with such a high round trip time (RTT). You should be able to tune the TCP behaviour on the receiver to allow it to scale the Receive Window much higher than the 212992 bits that the receiver sets.

The optimum TCP Receive Window for a 1Gbps link with a RTT of 73msecs (as in your capture), the result is 9,125MB (Bandwidth in bits * RTT in seconds = Windows Size in bits / 8 = Window size in Bytes)

For more information one place to start is this presentation by Kary Rogers.