[SOLVED] Installed new PVE 4.4 - lose ipv6 route after 1800 seconds

[fireon]

I reinstalled a long running pve on a server, after install it seems to working fine, but after 1800 seconds the default route is gone, i've installed a second one an the same problem.

2001:470:1a0c:569::/64  proto kernel  metric 256  expires 2591961sec pref medium
fe80::/64  proto kernel  metric 256  pref medium
default via fe80::6651:6ff:fec8:f500  proto ra  metric 1024  expires 1761sec hoplimit 64 pref medium

The server have the same hardware, same configuration, nothing was changed. IPV6 Address and GW setuped over the PVE Interface. Everything as always.
After this cowndown i'am offline. Is there something special on new ISO-installer?
Interfaces:

auto lo
iface lo inet loopback

iface eth0 inet manual

iface eth1 inet manual

auto eth2
iface eth2 inet6 static
address  fda0:22c2:9242:382e::2
netmask  64

auto bond0
iface bond0 inet manual
slaves eth0 eth1
bond_miimon 100
bond_mode 802.3ad
bond_xmit_hash_policy layer3+4

auto vmbr0
iface vmbr0 inet static
address  71.225.70.222
netmask  255.255.255.224
gateway  71.225.70.221
bridge_ports bond0
bridge_stp off
bridge_fd 0

iface vmbr0 inet6 static
address  2001:470:1a0c:569:ec4:7afc:feac:a815
netmask  64
gateway  2001:470:1a0c:569::9

Thanks a lot

 

[fireon]

I have changed the file:

cat  /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

But i think this is not the real solution, because fore the new setup this has worked fine.

Thanks for some infos