Preuve que ça fonctionne bien, voici le RA via un tcpdump:
00:00:00.000000 IP6 (flowlabel 0xb93ae, hlim 255, next-header ICMPv6 (58) payload length: 88) fe80::ba8c

fe09:e14 > ip6-allnodes: [icmp6 sum ok] ICMP6, router advertisement, length 88
hop limit 64, Flags [managed, other stateful], pref medium, router lifetime 1800s, reachable time 0ms, retrans timer 0ms
prefix info option (3), length 32 (4): 2001:861

6ea0::/64, Flags [onlink, auto, router], valid time 86400s, pref. time 14400s
0x0000: 40e0 0001 5180 0000 3840 0000 0000 2001
0x0010: 0861 3889 6ea0 0000 0000 0000 0000
rdnss option (25), length 24 (3): lifetime 600s, addr: 2001:861

6ea0:ba8c

fe09:e14
0x0000: 0000 0000 0258 2001 0861 3889 6ea0 ba8c
0x0010: 2bff fe09 0e14
mtu option (5), length 8 (1): 1500
0x0000: 0000 0000 05dc
source link-address option (1), length 8 (1): b8:8c:2b:09:0e:14
0x0000: b88c 2b09 0e14
Ma gateway IPv6 est: 2001:861

6ea0:ba8c

fe09:e14