Pour les serveurs de Bouygues, il n'y a pas de problème : ci-dessous, je fais un test sur le serveur BBR en le forçant en Cubic, puis un second sans forcer le protocole de congestion et je suis bien en BBR.
Au passage, vous pouvez voir et c'est systématiquement le cas, j'ai des débits Cubic meilleurs que BBR avec ma box 5G.
$ iperf3 -c paris.bbr.iperf.bytel.fr -p 9220 -i 10 -R -V --congestion=cubic
iperf 3.17.1
Linux HP 6.11.0-19-generic #19-Ubuntu SMP PREEMPT_DYNAMIC Wed Feb 12 21:43:43 UTC 2025 x86_64
Control connection MSS 1390
Time: Sun, 16 Mar 2025 17:05:17 GMT
Connecting to host paris.bbr.iperf.bytel.fr, port 9220
Reverse mode, remote host paris.bbr.iperf.bytel.fr is sending
Cookie: 5j4pi3iqkaed55thvbfbmodzdh22xdbhf5qa
TCP MSS: 1390 (default)
[ 5] local 2a01:cb09:b063:610c:6cf8:1107:dda0:5676 port 48848 connected to 2001:864:f003::2:1 port 9220
Starting Test: protocol: TCP, 1 streams, 131072 byte blocks, omitting 0 seconds, 10 second test, tos 0
[ ID] Interval Transfer Bitrate Retr Cwnd
[ 5] 0.00-10.01 sec 113 MBytes 94.6 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
Test Complete. Summary Results:
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-10.10 sec 119 MBytes 98.7 Mbits/sec 0 sender
[ 5] 0.00-10.01 sec 113 MBytes 94.6 Mbits/sec receiver
snd_tcp_congestion cubic
rcv_tcp_congestion cubic
iperf Done.
$ iperf3 -c paris.bbr.iperf.bytel.fr -p 9220 -i 10 -R -V
iperf 3.17.1
Linux HP 6.11.0-19-generic #19-Ubuntu SMP PREEMPT_DYNAMIC Wed Feb 12 21:43:43 UTC 2025 x86_64
Control connection MSS 1390
Time: Sun, 16 Mar 2025 17:05:35 GMT
Connecting to host paris.bbr.iperf.bytel.fr, port 9220
Reverse mode, remote host paris.bbr.iperf.bytel.fr is sending
Cookie: bmqydgalpmpql4axbcqmao6civoad4aodpgu
TCP MSS: 1390 (default)
[ 5] local 2a01:cb09:b063:610c:6cf8:1107:dda0:5676 port 34304 connected to 2001:864:f003::2:1 port 9220
Starting Test: protocol: TCP, 1 streams, 131072 byte blocks, omitting 0 seconds, 10 second test, tos 0
[ ID] Interval Transfer Bitrate Retr Cwnd
[ 5] 0.00-10.01 sec 56.2 MBytes 47.1 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
Test Complete. Summary Results:
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-10.05 sec 59.8 MBytes 49.9 Mbits/sec 0 sender
[ 5] 0.00-10.01 sec 56.2 MBytes 47.1 Mbits/sec receiver
snd_tcp_congestion bbr
rcv_tcp_congestion cubic
iperf Done.