In a related issue, It took our attention that whenever we run a rrul or rrul_var test, upload traffic seems to be absent.

Below examples were performed with two servers connected back-to-back with no router in between to rule out any blockage (they connect using an ethernet switch with ports in the same Vlan).
 
 `$ flent rrul_var -H 172.16.1.40 --test-parameter bidir_streams=6 --test-parameter markings=11,13,15,17,19,21`

Summary of rrul_var test run from 2020-12-17 21:34:16.260047

 Ping (ms) avg         :             2.65          N/A ms              350
 Ping (ms)::ICMP       :            6.62         8.37 ms              350
 Ping (ms)::UDP 0 (11) :         1.99         0.14 ms              350
 Ping (ms)::UDP 1 (13) :         1.98         0.14 ms              350
 Ping (ms)::UDP 2 (15) :         1.96         0.14 ms              350
 Ping (ms)::UDP 3 (17) :         2.00         0.14 ms              350
 Ping (ms)::UDP 4 (19) :         2.00         0.14 ms              350
 Ping (ms)::UDP 5 (21) :         1.99         0.14 ms              350
 TCP download avg      :       156.53          N/A Mbits/s          350
 TCP download sum      :       939.18          N/A Mbits/s          350
 TCP download::0 (11)  :       190.43       171.36 Mbits/s         350  ---> OK
 TCP download::1 (13)  :       166.60       170.35 Mbits/s         350
 TCP download::2 (15)  :       143.99       156.95 Mbits/s         350
 TCP download::3 (17)  :       171.11       170.65 Mbits/s         350
 TCP download::4 (19)  :       110.92        94.05 Mbits/s         350
 TCP download::5 (21)  :       156.13         0.01 Mbits/s         350
 TCP totals            :              939.87          N/A Mbits/s         350
 TCP upload avg        :         0.12               N/A Mbits/s         350
 TCP upload sum        :        0.69               N/A Mbits/s         350
 TCP upload::0 (11)    :         0.19              0.18 Mbits/s         350  ---> No data
 TCP upload::1 (13)    :         0.10              0.17 Mbits/s         350
 TCP upload::2 (15)    :         0.04              0.07 Mbits/s         350
 TCP upload::3 (17)    :         0.14              0.13 Mbits/s         350
 TCP upload::4 (19)    :         0.09              0.13 Mbits/s         350
 TCP upload::5 (21)    :         0.13              0.14 Mbits/s         350

Now, if we run a tcp_12up test, we see upstream traffic:

 Ping (ms) ICMP :        2.22         2.55 ms                  350
 TCP upload avg :       41.77          N/A Mbits/s          350
 TCP upload sum :     501.25          N/A Mbits/s         350
 TCP upload::1  :        38.43        38.24 Mbits/s          350
 TCP upload::10 :        40.92        39.39 Mbits/s         350
 TCP upload::11 :        42.97        41.55 Mbits/s         350
 TCP upload::12 :        46.13        39.80 Mbits/s         350
 TCP upload::2  :        46.77        44.63 Mbits/s         350
 TCP upload::3  :        40.24        39.21 Mbits/s         350
 TCP upload::4  :        40.75        40.54 Mbits/s         350
 TCP upload::5  :        40.41        38.85 Mbits/s         350
 TCP upload::6  :        42.30        40.38 Mbits/s         350
 TCP upload::7  :        41.68        40.38 Mbits/s         350
 TCP upload::8  :        40.70        39.47 Mbits/s         350
 TCP upload::9  :        39.95        40.17 Mbits/s         350

Apparently, on bi-directional tests, upload traffic doesn't show, but if we run a Upsteram-only test, it works.  

Traffic graphs on port connecting the servers show that indeed there is not Upstream traffic during testing.

Upload traffic must be present, otherwise how the second server is replying?

 Is there any way to make upload traffic show up on rrul testing?


Thanks.

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