I am trying to transfer multiple files ranging in size from 100 MB to 2 GB via SFTP over a WAN link. The RTT interval on this link ranges from 200 ms to 800ms. The WAN links operates at approximately 20 mbps. I have already done some research on TCP optimization and I have applied some of the TCP tuning principles detailed in my research (increasing buffer size), however I am still getting file upload speeds of around 700 KBps. Are there any other TCP or SFTP optimization methods I could use that could increase transfer speeds on this link? Any feedback is appreciated.
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