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
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