Petite précision, le problème de perte d'IPv6 ne semble survenir qu'après un redémarrage. Je suis monté à des uptime de plus d'un mois sans rencontrer de perte d'IPv6.

À chaque fois que je vois que je n'ai plus d'IPv6, j'ai redémarré la box quelques heures avant (par exemple pour aller tester ma box chez un voisin avant de souscrire à l'offre)

La box permet de déconnecter le WAN et de le reconnecter, mais cela ne résout pas le problème.

Voici ce que cela donne avec de l'IPv6, aprés un reboot :


IPv6 utilisé par mon PC : 2a01:cb09:b065:6fa7:1b44:f248:5e60:48d4

$ ip -6 -c addr show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 state UNKNOWN qlen 1000
    inet6 ::1/128 scope host noprefixroute
       valid_lft forever preferred_lft forever
3: wlp2s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 state UP qlen 1000
    inet6 2a01:cb09:b065:6fa7::fd4/128 scope global dynamic noprefixroute
       valid_lft 70310sec preferred_lft 27110sec
    inet6 2a01:cb09:b065:6fa7:1b44:f248:5e60:48d4/64 scope global temporary dynamic
       valid_lft 86027sec preferred_lft 42827sec
    inet6 2a01:cb09:b065:6fa7:fd0c:6605:aa9b:4d59/64 scope global dynamic mngtmpaddr noprefixroute
       valid_lft 86027sec preferred_lft 42827sec
    inet6 fe80::53f7:fcb1:63e2:f834/64 scope link noprefixroute
       valid_lft forever preferred_lft forever

Les routes :
$ ip -6 route show
2a01:cb09:b065:6fa7::fd4 dev wlp2s0 proto kernel metric 600 pref medium
2a01:cb09:b065:6fa7::/64 dev wlp2s0 proto ra metric 600 pref medium
fe80::/64 dev wlp2s0 proto kernel metric 1024 pref medium
default via fe80::aafb:40ff:fed2:3c4f dev wlp2s0 proto ra metric 600 pref medium

Ping vers mon préfixe::0 et mon préfixe::1

$ ping 2a01:cb09:b065:6fa7::0
PING 2a01:cb09:b065:6fa7::0 (2a01:cb09:b065:6fa7:: ) 56 data bytes
64 bytes from 2a01:cb09:b065:6fa7::1: icmp_seq=1 ttl=64 time=852 ms
64 bytes from 2a01:cb09:b065:6fa7::1: icmp_seq=2 ttl=64 time=1.64 ms
64 bytes from 2a01:cb09:b065:6fa7::1: icmp_seq=3 ttl=64 time=1.52 ms
64 bytes from 2a01:cb09:b065:6fa7::1: icmp_seq=4 ttl=64 time=1.80 ms
64 bytes from 2a01:cb09:b065:6fa7::1: icmp_seq=5 ttl=64 time=1.35 ms
64 bytes from 2a01:cb09:b065:6fa7::1: icmp_seq=6 ttl=64 time=1.78 ms
64 bytes from 2a01:cb09:b065:6fa7::1: icmp_seq=7 ttl=64 time=5.34 ms
64 bytes from 2a01:cb09:b065:6fa7::1: icmp_seq=8 ttl=64 time=1.42 ms
^C
--- 2a01:cb09:b065:6fa7::0 ping statistics ---
8 packets transmitted, 8 received, 0% packet loss, time 7010ms
rtt min/avg/max/mdev = 1.348/108.337/851.863/281.028 ms

$ ping 2a01:cb09:b065:6fa7::1
PING 2a01:cb09:b065:6fa7::1 (2a01:cb09:b065:6fa7::1) 56 data bytes
64 bytes from 2a01:cb09:b065:6fa7::1: icmp_seq=1 ttl=64 time=4.78 ms
64 bytes from 2a01:cb09:b065:6fa7::1: icmp_seq=2 ttl=64 time=1.98 ms
64 bytes from 2a01:cb09:b065:6fa7::1: icmp_seq=3 ttl=64 time=1.94 ms
64 bytes from 2a01:cb09:b065:6fa7::1: icmp_seq=4 ttl=64 time=1.38 ms
64 bytes from 2a01:cb09:b065:6fa7::1: icmp_seq=5 ttl=64 time=4.96 ms
64 bytes from 2a01:cb09:b065:6fa7::1: icmp_seq=6 ttl=64 time=1.56 ms
64 bytes from 2a01:cb09:b065:6fa7::1: icmp_seq=7 ttl=64 time=1.44 ms
64 bytes from 2a01:cb09:b065:6fa7::1: icmp_seq=8 ttl=64 time=1.79 ms
^C
--- 2a01:cb09:b065:6fa7::1 ping statistics ---
8 packets transmitted, 8 received, 0% packet loss, time 7008ms
rtt min/avg/max/mdev = 1.380/2.479/4.958/1.396 ms