Proxmox7 ipV6 problem hetzner

[wfamy]

Hi all,
I am fighting with my new proxmox 7 about network configuration.

interfaces auto lo iface lo inet loopback iface lo inet6 loopback auto enp2s0 iface enp2s0 inet static address 95.216.20.91/26 gateway 95.216.20.65 pointopoint 95.216.20.65 up route add -net 95.216.20.64 netmask 255.255.255.192 gw 95.216.20.65 dev enp2s0 # route 95.216.20.64/26 via 95.216.20.65 iface enp2s0 inet6 static address 2a01:4f9:2a:14a4::2/128 gateway fe80::1 auto lan0 iface lan0 inet static address 192.168.0.1/24 ovs_type OVSIntPort ovs_bridge vmbr0 auto ipv6 iface ipv6 inet6 static address 2a01:4f9:2a:14a4::1/64 ovs_type OVSIntPort ovs_bridge vmbr0 auto vmbr0 iface vmbr0 inet manual ovs_type OVSBridge ovs_ports lan0 ipv6
------------------------
egrep -e '(^$|^#)' -v /etc/sysctl.conf
net.ipv4.ip_forward=1
net.ipv6.conf.all.forwarding=1
net.ipv6.conf.default.forwarding = 1
net.ipv6.conf.all.forwarding = 1
net.ipv6.conf.default.proxy_ndp = 1
net.ipv6.conf.all.proxy_ndp = 1
net.ipv4.conf.all.log_martians = 1
-------------------------

iptables -t nat -A POSTROUTING -o enp2s0 -j MASQUERADE
ip route add 192.168.0.0/24 dev vmbr0

---------------------------
So I create a new lxc 111 with ipv4 192.168.0.111 and ipv6 2a01:4f9:2a:14a4::111

when
from host:

ping 2a01:4f9:2a:14a4::111
PING 2a01:4f9:2a:14a4::111(2a01:4f9:2a:14a4::111) 56 data bytes
64 bytes from 2a01:4f9:2a:14a4::111: icmp_seq=1 ttl=64 time=0.260 ms
64 bytes from 2a01:4f9:2a:14a4::111: icmp_seq=2 ttl=64 time=0.022 ms
----
ping 192.168.0.111
PING 192.168.0.111 (192.168.0.111) 56(84) bytes of data.
64 bytes from 192.168.0.111: icmp_seq=1 ttl=64 time=0.244 ms
64 bytes from 192.168.0.111: icmp_seq=2 ttl=64 time=0.019 ms

ping 2001:4860:4860::8888
PING 2001:4860:4860::8888(2001:4860:4860::8888) 56 data bytes
64 bytes from 2001:4860:4860::8888: icmp_seq=1 ttl=108 time=23.2 ms
64 bytes from 2001:4860:4860::8888: icmp_seq=2 ttl=108 time=23.1 ms

no pb
-------------------
from guest
ing 95.216.20.91
PING 95.216.20.91 (95.216.20.91) 56(84) bytes of data.
64 bytes from 95.216.20.91: icmp_seq=1 ttl=64 time=0.293 ms
64 bytes from 95.216.20.91: icmp_seq=2 ttl=64 time=0.057 ms
^C
--- 95.216.20.91 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1008ms
rtt min/avg/max/mdev = 0.057/0.175/0.293/0.118 ms
root@tesst111:/etc/network# ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
64 bytes from 8.8.8.8: icmp_seq=1 ttl=118 time=7.39 ms
64 bytes from 8.8.8.8: icmp_seq=2 ttl=118 time=7.39 ms

ok it works
---------------------------------
For IPV6 It do not works

PING 2a01:4f9:2a:14a4::2(2a01:4f9:2a:14a4::2) 56 data bytes
From 2a01:4f9:2a:14a4::111 icmp_seq=1 Destination unreachable: Address unreachable
From 2a01:4f9:2a:14a4::111 icmp_seq=2 Destination unreachable: Address unreachable
From 2a01:4f9:2a:14a4::111 icmp_seq=3 Destination unreachable: Address unreachable


I am looking for any help.
regards