Hi On Thu, Oct 4, 2018 at 10:42 AM Rostyslav Maryliak < rostyslav.maryl...@idealscorp.com> wrote:
> Dear Ilya, > > As far as I understood you are talking about Windows Server Feature. If > yes than it is NOT installed. > > "are you using intel drivers instead of windows drivers ?" > I've installed them when I was trying to figure it out by myself. That is > why I've installed all latest OS updates, network card drivers, reinstalled > latest OpenVPN version etc. > But it doesn't work anyway nor with intel drivers or without them. > > "is version the same accross servers ? firmware ? " > No, one servers have Intel network card, another Broadcom card, another > one HP card. They are not equal at all. > > If the bandwidth in clear is "great" but through the tunnel is 30-40 kbps, I suppose there is a problem related to openvpn tunnel or how it interacts with the netwrok stack on server 2016. You do not say how much the "great" speed in clear is, but I guess there is an order of magnitude degradation. FWIW, I fired up a 2016 server on google compute and measured bandwidth using iperf3 and a Linux openvpn server -- I don't have a Windows server handy to test against. In clear I got about 50 mbps, through tunnel about 25mbps --- in both directions. Although the CPU is not loaded (hovers around 10-15%) that's the kind of speed I usually get with stock options so looks like client on server-2016 VM to Linux server works fine. However, the above is using iperf -s on Linux side for upload measurements and iperf -s on Windows side for downloads. Using the -R switch of iperf misbehaves through the tunnel in one direction: with iperf3 -s on Linux side and iperf3 -R -c on Windows side, Linux reports 0 bits/s for about 10 seconds and then the transfer starts and picks up to ~25 mbps. The windows side shows nothing for 10 seconds and then picks up. Also the final stats report 100's of retries. This happens only through the tunnel, not in clear. But in this case the data is flowing from Linux to Windows so not the direction that you have problem with. Using -R switch in the opposite direction works normally. Selva Selva
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