J'ai fouillé un peu mieux le net, et chose stupide, j’avais réglé la MTU de mon côté, pas du tunnel... du coup j'ai mis 1472 des 2 côtés et j'ai beaucoup moins de perte (et même 0 sur le premier ping que j'ai fait
renaud@renaud-pc:~$ ping6 lafibre.info
PING lafibre.info(lafibre.info (2a01:6e00:10:410::2)) 56 data bytes
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=1 ttl=58 time=49.6 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=2 ttl=58 time=49.4 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=3 ttl=58 time=49.5 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=4 ttl=58 time=50.9 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=5 ttl=58 time=49.4 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=6 ttl=58 time=50.3 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=7 ttl=58 time=49.5 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=8 ttl=58 time=52.9 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=9 ttl=58 time=48.8 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=10 ttl=58 time=72.7 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=11 ttl=58 time=49.3 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=12 ttl=58 time=50.3 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=13 ttl=58 time=50.4 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=14 ttl=58 time=49.9 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=15 ttl=58 time=51.8 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=16 ttl=58 time=54.4 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=17 ttl=58 time=49.9 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=18 ttl=58 time=50.8 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=19 ttl=58 time=49.3 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=20 ttl=58 time=51.9 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=21 ttl=58 time=50.9 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=22 ttl=58 time=49.9 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=23 ttl=58 time=50.9 ms
^C
--- lafibre.info ping statistics ---
23 packets transmitted, 23 received, 0% packet loss, time 22029ms
rtt min/avg/max/mdev = 48.889/51.477/72.748/4.708 ms
renaud@renaud-pc:~$ ping6 lafibre.info
PING lafibre.info(lafibre.info (2a01:6e00:10:410::2)) 56 data bytes
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=1 ttl=58 time=55.3 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=2 ttl=58 time=53.6 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=3 ttl=58 time=51.1 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=4 ttl=58 time=50.7 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=5 ttl=58 time=50.9 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=7 ttl=58 time=50.6 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=8 ttl=58 time=49.2 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=9 ttl=58 time=50.5 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=10 ttl=58 time=52.9 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=11 ttl=58 time=51.0 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=12 ttl=58 time=50.2 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=13 ttl=58 time=90.6 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=14 ttl=58 time=52.0 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=15 ttl=58 time=52.9 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=16 ttl=58 time=53.0 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=17 ttl=58 time=56.4 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=18 ttl=58 time=57.5 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=19 ttl=58 time=54.0 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=20 ttl=58 time=52.9 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=21 ttl=58 time=78.7 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=22 ttl=58 time=52.3 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=23 ttl=58 time=49.3 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=24 ttl=58 time=50.5 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=25 ttl=58 time=50.2 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=26 ttl=58 time=49.7 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=27 ttl=58 time=49.1 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=28 ttl=58 time=48.9 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=29 ttl=58 time=50.6 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=30 ttl=58 time=50.9 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=31 ttl=58 time=60.9 ms
^C
--- lafibre.info ping statistics ---
31 packets transmitted, 30 received, 3% packet loss, time 30072ms
rtt min/avg/max/mdev = 48.947/54.257/90.651/8.689 ms
renaud@renaud-pc:~$ ping6 lafibre.info
PING lafibre.info(lafibre.info (2a01:6e00:10:410::2)) 56 data bytes
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=1 ttl=58 time=50.2 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=2 ttl=58 time=51.1 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=3 ttl=58 time=55.2 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=4 ttl=58 time=51.9 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=5 ttl=58 time=54.2 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=6 ttl=58 time=83.0 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=7 ttl=58 time=53.5 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=8 ttl=58 time=51.9 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=9 ttl=58 time=49.4 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=10 ttl=58 time=50.7 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=11 ttl=58 time=50.1 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=12 ttl=58 time=49.6 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=13 ttl=58 time=50.1 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=14 ttl=58 time=49.2 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=15 ttl=58 time=49.1 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=16 ttl=58 time=49.5 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=17 ttl=58 time=50.9 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=18 ttl=58 time=52.1 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=19 ttl=58 time=49.6 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=20 ttl=58 time=50.1 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=22 ttl=58 time=50.3 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=23 ttl=58 time=52.2 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=24 ttl=58 time=49.4 ms
64 bytes from lafibre.info (2a01:6e00:10:410::2): icmp_seq=25 ttl=58 time=50.3 ms
^C
--- lafibre.info ping statistics ---
25 packets transmitted, 24 received, 4% packet loss, time 24033ms
rtt min/avg/max/mdev = 49.159/52.281/83.054/6.616 ms
renaud@renaud-pc:~$
Par contre même avec moins de perte les DL sont toujours aussi instables, faut vraiment que ce soit 0 en permanence...
Et il faudra qu'on m'explique : Je lance plusieurs DL et même si le débit est faible, avec 5 ou 6 je vais remplir ma BP (ici ça donne 1329ko/s) , alors qu'un seul n'arrive pas à atteindre le max...