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I have a Debian server with OpenSSH_6.7p1 installed and I use 4096 bits key to encrypt the communication. No matter I download or upload a file from/to a client (I tried WinSCP and Syncback and they are on the whole the same) in the same LAN, the speed is usually 1-2MB/S. Is this normal? (I guess it is not since my p2p download speed can be up to 20MB/S)
It's a long shot but any chance you have a 10Mb/s network connection or WiFi link somewhere in the path? Or a lot of other network traffic on the server? – Andrew – 2016-10-31T16:10:45.877
Hi @Andrew no usually I am the only user of the wifi. Besides, the Debian server is using networking cable which should be much faster. – Mamsds – 2016-10-31T16:23:17.410
SFTP is CPU-intensive. Test a faster server to see if that is the bottleneck. – DrMoishe Pippik – 2016-10-31T17:04:16.900
Hi @DrMoishePippik, I am using a quad-core processor (to be specific, it is Intel(R) Core(TM) i7-4702MQ CPU @ 2.20GHz) and I only upload/download one file at a time. Therefore, I guess it should not be the cause of the problem. – Mamsds – 2016-10-31T17:11:13.870