DHCP with vmbr0 or eth0 and IPv6

[informant]

Hi all,

i have following configuration:

# network interface settings
auto lo
iface lo inet loopback

iface eth1 inet manual

iface eth0 inet manual

auto vmbr0
iface vmbr0 inet static
        address  217.*.*.69
        netmask  255.255.254.0
        gateway  217.*.*.1
        bridge_ports eth0
        bridge_stp off
        bridge_fd 0

auto vmbr1
iface vmbr1 inet static
        address  10.11.12.61
        netmask  255.255.0.0
        bridge_ports eth1
        bridge_stp off
        bridge_fd 0

if i add following line:

iface vmbr0 inet6 dhcp

and restart network service

it´s hang and i doesn´t get a ipv6 adress via dhcp of dhcp-server. what can i do? do you have a idea?

thanks and regards