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 "Cl?ment P?ron" <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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