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[rare-dev] iperf3 is working only in one direction


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  • From: Carmen Misa Moreira <>
  • To: <>
  • Subject: [rare-dev] iperf3 is working only in one direction
  • Date: Wed, 5 Oct 2022 16:53:49 +0200
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Hi,

I'm doing some tests and I can only can generate traffic in way direction and not in the other:

[root@m1~]# iperf3 -c 2001:67c:2c4:1::4

[  5] local 2001:1458:301:cd::100:3d8 port 48550 connected to 2001:67c:2c4:1::4 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec  1.06 GBytes  9.12 Gbits/sec  1370   1.06 MBytes
[  5]   1.00-2.00   sec  1.06 GBytes  9.14 Gbits/sec  188   1.46 MBytes
[  5]   2.00-3.00   sec  1.07 GBytes  9.17 Gbits/sec  374   1.29 MBytes
[  5]   3.00-4.00   sec  1.06 GBytes  9.13 Gbits/sec   24   1.71 MBytes

[root@m1~]# iperf3 -c 2001:67c:2c4:1::4 -R

Connecting to host 2001:67c:2c4:1::4, port 5201
Reverse mode, remote host 2001:67c:2c4:1::4 is sending
[  5] local 2001:1458:301:cd::100:3d8 port 59874 connected to 2001:67c:2c4:1::4 port 5201
[ ID] Interval           Transfer     Bitrate
[  5]   0.00-1.00   sec  0.00 Bytes  0.00 bits/sec
[  5]   1.00-2.00   sec  0.00 Bytes  0.00 bits/sec
[  5]   2.00-3.00   sec  0.00 Bytes  0.00 bits/sec
[  5]   3.00-4.00   sec  0.00 Bytes  0.00 bits/sec

We connected directly to the routers on both sides of the P4 switch so the VLANs don't pass through the P4 switch and iperf3 works in both directions so probably something is going wrong here. Any idea?

We are using pure layer 2 bridges on the P4 switch.

Thanks for your time,

Carmen Misa


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