iperf3 only reports speed on first interval, the rest are 0.00

[asciifaceman]

I can get normal responses within my network, but when talking out (to another server I own) only the first interval reports:

[ ID] Interval           Transfer     Bandwidth       Retr  Cwnd
[  4]   0.00-1.00   sec  67.9 KBytes   555 Kbits/sec    2   1.41 KBytes       
[  4]   1.00-2.00   sec  0.00 Bytes  0.00 bits/sec    1   1.41 KBytes       
[  4]   2.00-3.00   sec  0.00 Bytes  0.00 bits/sec    0   1.41 KBytes       
[  4]   3.00-4.00   sec  0.00 Bytes  0.00 bits/sec    1   1.41 KBytes       
[  4]   4.00-5.00   sec  0.00 Bytes  0.00 bits/sec    0   1.41 KBytes       
[  4]   5.00-6.00   sec  0.00 Bytes  0.00 bits/sec    0   1.41 KBytes       
[  4]   6.00-7.00   sec  0.00 Bytes  0.00 bits/sec    0   1.41 KBytes       
[  4]   7.00-8.00   sec  0.00 Bytes  0.00 bits/sec    1   1.41 KBytes       
[  4]   8.00-9.00   sec  0.00 Bytes  0.00 bits/sec    0   1.41 KBytes       
[  4]   9.00-10.00  sec  0.00 Bytes  0.00 bits/sec    0   1.41 KBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bandwidth       Retr
[  4]   0.00-10.00  sec  67.9 KBytes  55.6 Kbits/sec    5             sender
[  4]   0.00-10.00  sec  1.41 KBytes  1.16 Kbits/sec                  receiver

This behavior exists no matter the direction the test travels.

If this is an issue on my end, I can't seem to find a similar instance of it in other reports.

OS:
3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt25-2+deb8u3 (2016-07-02) x86_64 GNU/Linux
&
3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt11-1+deb8u5 (2015-10-09) x86_64 GNU/Linux

[asciifaceman]

with -R flag

[ ID] Interval           Transfer     Bandwidth
[  4]   0.00-1.00   sec  0.00 Bytes  0.00 bits/sec                  
[  4]   1.00-2.00   sec  0.00 Bytes  0.00 bits/sec                  
[  4]   2.00-3.00   sec  0.00 Bytes  0.00 bits/sec                  
[  4]   3.00-4.00   sec  0.00 Bytes  0.00 bits/sec                  
[  4]   4.00-5.00   sec  0.00 Bytes  0.00 bits/sec                  
[  4]   5.00-6.00   sec  0.00 Bytes  0.00 bits/sec                  
[  4]   6.00-7.00   sec  0.00 Bytes  0.00 bits/sec                  
[  4]   7.00-8.00   sec  0.00 Bytes  0.00 bits/sec                  
[  4]   8.00-9.00   sec  0.00 Bytes  0.00 bits/sec                  
[  4]   9.00-10.00  sec  0.00 Bytes  0.00 bits/sec                  
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bandwidth       Retr
[  4]   0.00-10.00  sec   198 KBytes   162 Kbits/sec    4             sender
[  4]   0.00-10.00  sec  0.00 Bytes  0.00 bits/sec                  receiver

I understand Bandwith/transfer is rounded down during intervals, but that is an extremely low number

[asciifaceman]

Unfortunately, I am suspecting this might be a corporate QoS problem

[bmah888]

OK, closing as invalid.

[brettus78]

I have the same issue... there's nothing else on this link but my device (point-to-point testing) - and got the same results.
Note that the testing was done using Linux Mint and the interface was configured as a VLAN interface which patched directly into a trunk from carrier.

Any thoughts?