OVH(fr) & IPv6 that cuts after a while

[LDN]

Hi,

I have a problem with my IPv6 configuration at OVH France.
After a while, I completely lose the ipv6 on the host, as well as the VMs.

When I connect to the host in ssh and run the command : "ping6 ipv6.google.com"
IPv6 comes back instantly! (even on VMs).

Do you have any idea of a problem?
This is my configuration :

Proxmox HOST :

/etc/network/interfaces :

auto lo
iface lo inet loopback

iface eno1 inet manual

iface eno2 inet manual

auto vmbr0
iface vmbr0 inet static
   < ... CONFIG IPv4 ... >
    bridge_ports eno1
    bridge_stp off
    bridge_fd 0

iface vmbr0 inet6 static
    address  2001:41d0:XXX:11aa:XXX:XXX:XXX:170
    netmask  64
    post-up /sbin/ip -f inet6 route add 2001:41d0:XXX:11ff:ff:ff:ff:ff dev vmbr0
    post-up /sbin/ip -f inet6 route add default via 2001:41d0:XXX:11ff:ff:ff:ff:ff
    pre-down /sbin/ip -f inet6 route del 2001:41d0:XXX:11ff:ff:ff:ff:ff dev vmbr0
    pre-down /sbin/ip -f inet6 route del default via 2001:41d0:XXX:11ff:ff:ff:ff:ff

/etc/sysctl.d/ipv6.conf

net.ipv6.conf.default.accept_ra = 0
net.ipv6.conf.default.autoconf = 0
net.ipv6.conf.all.accept_ra = 0
net.ipv6.conf.all.autoconf = 0
net.ipv6.conf.vmbr0.accept_ra = 0
net.ipv6.conf.vmbr0.autoconf = 0

Proxmox VM : (CentOS 7 )

/etc/sysconfig/network :

NETWORKING=yes
NETWORKING_IPV6=yes

/etc/sysconfig/network-scripts/ifcfg-eth0 :

HWADDR=00:50:56:XX:XX:XX
NAME="Réseau WAN"
TYPE=Ethernet
DEVICE=eth0
ONBOOT=yes
BOOTPROTO=static

< ... CONFIG IPv4 ... >

IPV6INIT=yes
IPV6_AUTOCONF=no
IPV6_DEFROUTE=yes
IPV6ADDR=2001:41d0:XXX:11aa:XX:XX:XX:176/64
IPV6ADDR_SECONDARIES="2001:41d0:XXX:11aa:XX:XX:XX:176/64 2001:41d0:XXX:11aa:XX:XX:XX:177/64 2001:41d0:XXX:11aa:XX:XX:XX:178/64 2001:41d0:XXX:11aa:XX:XX:XX:179/64 2001:41d0:XXX:11aa:XX:XX:XX:180/64 2001:41d0:XXX:11aa:XX:XX:XX:181/64 2001:41d0:XXX:11aa:XX:XX:XX:182/64 2001:41d0:XXX:11aa:XX:XX:XX:183/64"
IPV6_DEFAULTGW=2001:41d0:XXX:11ff:ff:ff:ff:ff

/etc/sysconfig/network-scripts/route6-eth0 :

2001:41d0:XXXX:11ff:ff:ff:ff:ff dev eth0
default via 2001:41d0:XXXX:11ff:ff:ff:ff:ff dev eth0

/etc/sysctl.d/ipv6.conf :

net.ipv6.conf.default.accept_ra = 0
net.ipv6.conf.default.autoconf = 0
net.ipv6.conf.all.accept_ra = 0
net.ipv6.conf.all.autoconf = 0
net.ipv6.conf.eth0.accept_ra = 0
net.ipv6.conf.eth0.autoconf = 0

In advance, thank you.

 

[bofh]

dissable the privacy extentention in ipv6
its the issue there