IPv6 stopped working after upgrading to 7

[harmonyp]

After upgrading to PVE 7 IPv6 has stopped working. If I restart the network (ifup -a) the 2001:41d0:803:8400::1/128 does start pinging until the node reboots again and the virtual machines then start pinging too.

auto lo
iface lo inet loopback


auto eth0
iface eth0 inet manual


auto eth1
iface eth1 inet manual


auto eth2
iface eth2 inet manual


auto eth3
iface eth3 inet manual


iface enp9s0f3u2u2c2 inet manual


auto bond0
iface bond0 inet manual
    bond-slaves eth0 eth1
    bond-miimon 100
    bond-mode 802.3ad
    bond-xmit-hash-policy layer2+3


auto bond1
iface bond1 inet manual
    bond-slaves eth2 eth3
    bond-miimon 100
    bond-mode 802.3ad
    bond-xmit-hash-policy layer2+3


auto vmbr0
iface vmbr0 inet static
    address 51.195.234.xxx/24
    gateway 51.195.234.254
    bridge-ports bond0
    bridge-stp off
    bridge-fd 0
    post-up echo 1 >/proc/sys/net/ipv4/ip_forward


iface vmbr0 inet6 static
    address 2001:41d0:803:8400::1/128
    gateway fe80::1
    up ip -6 route add 2001:41d0:803:8400::/56 dev vmbr0

 

[spirit]

do you use ifupdown2 ?

 

[harmonyp]

do you use ifupdown2 ?

Yes it is installed. If I modify the setting and apply it works until reboot.

 

[spirit]

mmm...not sure it could help, but can you try to add "auto vmbr0" again before "iface vmbr0 inet6 static"?

(I'm using dual stack ipv4/v6 without any problem with this)


also, you can add boot log in

/etc/default/networking

SYSLOG="yes"
DEBUG="yes"
VERBOSE="yes"

 

[spirit]

also, maybe try 'post-up' for "ip -6 route ...."

 

[harmonyp]

Looks like there is an issue with the eth1 interface

auto vmbr0
iface vmbr0 inet static
    address 51.195.234.xxx/24
    gateway 51.195.234.254
    bridge-ports eth0
    bridge-stp off
    bridge-fd 0


iface vmbr0 inet6 static
    address 2001:41d0:803:8400::1/128
    gateway fe80::1

works but

auto vmbr0
iface vmbr0 inet static
    address 51.195.234.xxx/24
    gateway 51.195.234.254
    bridge-ports eth1
    bridge-stp off
    bridge-fd 0


iface vmbr0 inet6 static
    address 2001:41d0:803:8400::1/128
    gateway fe80::1

fails both IPv4/IPv6

Thanks for your help @spirit