Добрый день!
Есть 2 одинаково настроенных узла и подключенных в один свич.
на одном ipv6 работает, а на другом нет. шлюз не отвечает на neighbor solicitation.
хост с рабочим ipv6:
root@str4:~# ping6 2a00:1111:0:123::1 -I vmbr0v123
PING 2a00:1111:0:123::1(2a00:1111:0:123::1) from 2a00:****:be4 vmbr0v123: 56 data bytes
64 bytes from 2a00:1111:0:123::1: icmp_seq=1 ttl=64 time=3.14 ms
64 bytes from 2a00:1111:0:123::1: icmp_seq=2 ttl=64 time=1.20 ms
^C
--- 2a00:1111:0:123::1 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1001ms
rtt min/avg/max/mdev = 1.208/2.176/3.145/0.969 ms
root@str4:~# ip -6 r | grep vmbr0v123
2a00:1111:0:123::/64 dev vmbr0v123 proto kernel metric 256 expires 1374427sec mtu 1500 advmss 1440 hoplimit 0
fe80::/64 dev vmbr0v123 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 0
root@str4:~# ip -6 nei | grep vmbr0v123
2a00:1111:0:123::1 dev vmbr0v123 lladdr a8:0c:0d:25:63:f4 router REACHABLE
хост с не рабочим ipv6:
root@str2:~# ping6 2a00:1111:0:123::1 -I vmbr0v123
PING 2a00:1111:0:123::1(2a00:1111:0:123::1) from 2a00:****:1f84 vmbr0v123: 56 data bytes
From 2a00:****:1f84 icmp_seq=2 Destination unreachable: Address unreachable
From 2a00:****:1f84 icmp_seq=3 Destination unreachable: Address unreachable
From 2a00:****:1f84 icmp_seq=4 Destination unreachable: Address unreachable
^C
--- 2a00:1111:0:123::1 ping statistics ---
4 packets transmitted, 0 received, +3 errors, 100% packet loss, time 2999ms
root@str2:ip -6 r | grep vmbr0v123
2a00:1111:0:123::/64 dev vmbr0v123 metric 1024 mtu 1500 advmss 1440 hoplimit 0
fe80::/64 dev vmbr0v123 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 0
root@str2:~# ip -6 nei | grep br0v3099
fe80::aa0c:dff:fe25:63f4 dev vmbr0v123 lladdr a8:0c:0d:25:63:f4 router REACHABLE
2a00:1111:0:123::1 dev vmbr0v123 FAILED
с включеным ipv6 forwarding та же история. ipv4 в этом направлении нормально работает. между хостом и роутером 1 свич.