Asymmetric speed w/ SSH Port Forwarding

[Mara Sophie Grosch]

Hi,

Just to be sure, you also checked your internet connection - at home or wherever you were at the time?

Best
Mara

Am 7. Juli 2021 17:41:17 MESZ schrieb "Clément Péron" <peron.clem at gmail.com>:
>Hi,
>
>I was trying to have a SSH tunnel with at least 150Mbps/s in both
>directions.
>
>I have a laptop computer under Ubuntu 20.04.2 and a remote server also
>under Ubuntu 20.04.2.
>
>I measured the speed of my internet connection with Iperf3 and without
>SSH Tunnel it is OK.
>$> iperf3 -c <SERVER_IP> -p 7503
>- 500 Mbits/sec laptop -> server
>$> iperf3 -c <SERVER_IP> -p 7503 -R
>- 927 Mbits/sec laptop <- server
>
>Then I open a SSH Tunnel: laptop -> server
>$> ssh -L 7503:127.0.0.1:7503 root at my_server
>
>Doing the iperf3 test again
>$> iperf3 -c 127.0.0.1 -p 7503
>- 13.6 Mbits/sec
>$> iperf3 -c 127.0.0.1 -p 7503 -R
>- 672 Mbits/sec
>
>And now the speed is terrible from my laptop to the server.
>
>In the iperf console this looks like this
>[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
>[  5]   0.00-1.00   sec  11.2 MBytes  94.3 Mbits/sec    2   1023 KBytes
>[  5]   1.00-2.00   sec  0.00 Bytes  0.00 bits/sec    1    639 KBytes
>[  5]   2.00-3.00   sec  1.25 MBytes  10.5 Mbits/sec    0    639 KBytes
>[  5]   3.00-4.00   sec  0.00 Bytes  0.00 bits/sec    0    639 KBytes
>[  5]   4.00-5.00   sec  1.25 MBytes  10.5 Mbits/sec    0    639 KBytes
>[  5]   5.00-6.00   sec  0.00 Bytes  0.00 bits/sec    0    639 KBytes
>[  5]   6.00-7.00   sec  1.25 MBytes  10.5 Mbits/sec    0    639 KBytes
>[  5]   7.00-8.00   sec  0.00 Bytes  0.00 bits/sec    0    639 KBytes
>[  5]   8.00-9.00   sec  0.00 Bytes  0.00 bits/sec    0    639 KBytes
>[  5]   9.00-10.00  sec  1.25 MBytes  10.5 Mbits/sec    0    639 KBytes
>
>During some seconds there is no Bitrate at all :(.
>
>I understand that the SSH tunnel will add some overhead and I will
>lose around 10/20% of Bandwidth but this looks like a huge drop.
>
>Do you have any idea what can create this behavior?
>
>Thanks for your help,
>Clement
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