Dear Selva, Longer test time shows the same results: *win2012r2 (iperf -c -R -t 30) + win2016 (iperf -s)* [ ID] Interval Transfer Bandwidth [ 4] 0.00-30.00 sec 1.75 MBytes *489 Kbits/sec * sender [ 4] 0.00-30.00 sec 1.58 MBytes *442 Kbits/sec * receiver
I am not sure if my UDP testing results are correct, but they are equal in both directions and depend on -R option: *1. iperf -c -u:* [ ID] Interval Transfer Bandwidth Jitter Lost/Total Datag rams [ 5] 0.00-1.00 sec 0.00 Bytes *0.00 bits/sec* 0.000 ms 0/0 (0%) [ 5] 1.00-2.00 sec 0.00 Bytes * 0.00 bits/sec* 0.000 ms 0/0 (0%) [ 5] 2.00-3.00 sec 0.00 Bytes *0.00 bits/sec* 0.000 ms 0/0 (0%) [ 5] 3.00-4.00 sec 0.00 Bytes *0.00 bits/sec* 0.000 ms 0/0 (0%) [ 5] 4.00-5.00 sec 0.00 Bytes *0.00 bits/sec * 0.000 ms 0/0 (0%) [ 5] 5.00-6.00 sec 0.00 Bytes *0.00 bits/sec* 0.000 ms 0/0 (0%) [ 5] 6.00-7.00 sec 0.00 Bytes *0.00 bits/sec* 0.000 ms 0/0 (0%) [ 5] 7.00-8.00 sec 0.00 Bytes *0.00 bits/sec* 0.000 ms 0/0 (0%) [ 5] 8.00-9.00 sec 0.00 Bytes *0.00 bits/sec* 0.000 ms 0/0 (0%) [ 5] 8.00-9.00 sec 0.00 Bytes *0.00 bits/sec * 0.000 ms 0/0 (0%) - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bandwidth Jitter Lost/Total Datag rams [ 5] 0.00-9.00 sec 0.00 Bytes *0.00 bits/sec* 0.000 ms 0/0 (0%) iperf3: the client has terminated *2. iperf -c -u -R:* [ ID] Interval Transfer Bandwidth Total Datagrams [ 5] 0.00-1.00 sec 120 KBytes *982 Kbits/sec* 15 [ 5] 1.00-2.00 sec 128 KBytes *1.05 Mbits/sec* 16 [ 5] 2.00-3.00 sec 128 KBytes *1.05 Mbits/sec* 16 [ 5] 3.00-4.00 sec 128 KBytes *1.05 Mbits/sec* 16 [ 5] 4.00-5.00 sec 128 KBytes *1.05 Mbits/sec* 16 [ 5] 5.00-6.00 sec 128 KBytes *1.05 Mbits/sec* 16 [ 5] 6.00-7.00 sec 128 KBytes *1.05 Mbits/sec *16 [ 5] 7.00-8.00 sec 128 KBytes *1.05 Mbits/sec* 16 [ 5] 8.00-9.00 sec 128 KBytes *1.05 Mbits/sec * 16 [ 5] 9.00-10.00 sec 128 KBytes *1.05 Mbits/sec* 16 [ 5] 10.00-11.00 sec 128 KBytes *1.05 Mbits/sec* 16 [ 5] 11.00-12.00 sec 128 KBytes *1.05 Mbits/sec* 16 [ 5] 12.00-13.00 sec 128 KBytes *1.05 Mbits/sec* 16 [ 5] 13.00-14.00 sec 128 KBytes *1.05 Mbits/sec* 16 [ 5] 14.00-14.89 sec 112 KBytes *1.03 Mbits/sec* 14 - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bandwidth Jitter Lost/Total Datag rams [ 5] 0.00-14.89 sec 1.85 MBytes *1.04 Mbits/sec* 0.000 ms 0/237 (0%) iperf3: interrupt - the server has terminated On Fri, Oct 5, 2018 at 5:25 PM Selva Nair <selva.n...@gmail.com> wrote: > Hi, > > On Fri, Oct 5, 2018 at 4:02 AM Rostyslav Maryliak < > rostyslav.maryl...@idealscorp.com> wrote: > >> 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 >> > > #1 and #3 shows the speed is good in both directions, so looks like the > problem surfaces only when -R is used. Not saying this is an iperf issue as > you see low bandwidth in general use as well. I don't know what causes this > (the TAP driver?) but hopefully others may chime in with some clue. > > Could you please re-do the -R tests with a longer test time (say iperf3 -t > 30 ...). Also test udp speeds (ie. iperf3 -u ...) keeping the tunnel udp. > > Thanks, > > 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. 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