Dear Selva, I've got a similar results. Except the outbound network speed for win2016 server. The bandwidth in clear is about 700 Mbits/sec in both directions and different measures (with -R option and without it):
[ ID] Interval Transfer Bandwidth [ 4] 0.00-10.00 sec 880 MBytes *739 Mbits/sec * sender [ 4] 0.00-10.00 sec 880 MBytes *738 Mbits/sec* receiver Here are the same measures through the VPN tunnel: *1. win2012r2 (iperf -s) + win2016 (iperf -c)* [ ID] Interval Transfer Bandwidth [ 4] 0.00-10.00 sec 103 MBytes * 86.2 Mbits/sec* sender [ 4] 0.00-10.00 sec 103 MBytes *86.1 Mbits/sec * receiver *2. win2012r2 (iperf -s) + win2016 (iperf -c -R)* The same as you in this mode I can see 0 bits/s for about 3-7 seconds and then the transfer starts and picks the normal transfer rate. [ ID] Interval Transfer Bandwidth [ 4] 0.00-10.00 sec 130 MBytes *109 Mbits/sec * sender [ 4] 0.00-10.00 sec 130 MBytes *109 Mbits/sec * receiver *3. win2012r2 (iperf -c) + win2016 (iperf -s)* [ ID] Interval Transfer Bandwidth [ 4] 0.00-10.00 sec 140 MBytes *117 Mbits/sec* sender [ 4] 0.00-10.00 sec 140 MBytes *117 Mbits/sec* receiver *4. win2012r2 (iperf -c -R) + win2016 (iperf -s)* [ ID] Interval Transfer Bandwidth [ 4] 0.00-10.00 sec 640 KBytes *524 Kbits/sec* sender [ 4] 0.00-10.00 sec 512 KBytes *419 Kbits/sec * receiver As you can see the network speed slows down for outbound direction so dramatically that I can't even compare them. Do you have the possibility to launch the similar setup with both Windows servers and perform the same tests? What else can I check and analyze on my side to resolve the issue? On Thu, Oct 4, 2018 at 7:15 PM Selva Nair <selva.n...@gmail.com> wrote: > 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 > -- Best regards, *Rostyslav Maryliak* System Administrator *iDeals™ Solutions Group*| + 38(073)437-72-51 <%2B%2038%28093%29575-35-16> | Skype: rostyslav.maryliak.ideals| *rostyslav.maryl...@idealscorp.com <dmitry.zaporozhche...@idealscorp.com>* | www.idealsvdr.com <http://www.idealscorp.com/> -- CONFIDENTIALITY NOTE: The information transmitted, including attachments, is intended only for the person(s) or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon this information by persons or entities other than the intended recipient is prohibited. If you received this in error, please contact the sender and destroy any copies of this information.
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