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Revision 1
anonymous user
asked 2018-12-05 16:45:01 +0000

Excessive TCP Dup ACK and TCP Retransmissions

I'm doing an SFTP transfer between two servers about 70ms RTT apart and seeing excessive TCP Dup ACK and TCP Retransmissions. The circuit size is 50 mbit/sec, but I'm getting a transfer speed of 500 kbit/sec or less. What could be causing this?

Receiver https://www.cloudshark.org/captures/e01c935ec6df

Sender https://www.cloudshark.org/captures/e7f8b79d93eb