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On Friday, 15 January 2021 22:43:36 GMT thelma@×××××××××××.com wrote: |
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> The fact that I'm logged via ssh over VPN to a remote network should not |
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> have any influence over network speed. |
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It may influence speed if you're trying to push a large file through the |
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tunnel. TCP over TCP tends to choke due to retransmissions: |
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http://sites.inka.de/bigred/devel/tcp-tcp.html |
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Is the VPN you mention using a TCP or UDP tunnel? |
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> I just made a loop: |
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> Network A ==> Internet ==> Network B |
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> ssh back to Network A over internet and run "rsync" I got same speed (as if |
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> I run the command locally) on Network A 112MB/s |
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> |
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> So the limiting factor is somewhere else. |
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I'm sorry, but I fail to understand with any clarity what runs where and how |
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when you test things locally, Vs remotely. I mean: |
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- Network topology; |
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- Network Protocols; |
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- Applications & application protocols; |
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- Relevant services on each peer; |
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- Actions on each peer; |
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- Results per action. |
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As already mentioned iperf or netcat/telnet results will confirm if this is |
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purely a network issue, ISPs performing deep packet inspection/throttling |
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affecting throughput asymmetrically, etc. |
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SSDs are typically faster than spinning disks, but not always as fast as |
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ramdisks/tmpfs, especially if write amplification takes place, TRIM kicks in, |
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etc. |
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Stacking network + application protocols can also have an adverse effect. |
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Applications like rsync which compare file names, sizes, hashes and what not, |
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do not offer a reliable speed comparison. |
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Methodically testing each component of the transmission system should get you |
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an answer at the end. |
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