Thanks for your responses. Unfortunately, there is a misunderstanding: No VPN whatsoever is involved. A VPS is a "Virtual Private Server", i.e. for the purpose of this discussion, just a server on the Internet. And I observe these slow download speeds even plugged directly into my modem, without any intervening equipment on my end.
I should also mention that the issue is intermittent. Shortly after I posted, the problem went away. (But it has done that before, so whatever it is is not a permanent fix.)
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I operate a VPS in a Hetzner data center. Hetzner is a large-ish Internet hosting company in Germany. I've noticed that, recently, connections to that VPS are often, but not always, unreasonably slow.
I pay for 25 Mbps Internet from Comcast, and according to https://fast.com/, that's what I get consistently when connecting to (Netflix's) Chicago servers. (Netflix operates fast.com). So it is unlikely that there is anything wrong with my physical connection to Comcast.
However, for example, downloading this file from my VPS:
https://tiker.net/tmp/dsl-tutorial.ova (about 2G
over my Comcast connection, I observe download speeds of only ~60-80 KB/s. Through the University of Illinois (my employer), I am easily able to get 20-30 MB/s. I observe the slowness both via IPv4 and IPv6. (Both endpoints are dual-stack.) At first, I thought that Comcast might have something against my VPS specifically, but then I noticed that many other sites in Germany are similarly slow, including:
(These are Linux CD images mirrored at a few German universities, so their upstream bandwidth is generally unlikely to be a bottleneck.)
However, not *all* traffic to Germany is slow. This download proceeds at the 3.5 MB/s that I'm used to:
- If you have any advice on what could be wrong, I would be grateful to hear about it.
- Please try the above URLs and let me know what download speeds you observe.
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