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OpenVZ support #1
Unfortunately I've never ran Proxmox (either OVZ) in Online.net and I'm currently unable to with my kidéchire, so what I'm saying below is in theory - feel free to correct me.
Proxmox (host) shouldn't have problems regarding IPv6 as it's Debian-based. However I found out that at least the ISO provided by Online.net comes with IPv6 kernel module disabled, so you may need to enable it.
For the guests, you need to enable IPv6 forwarding in the host and set the addresses for the containers using console (vzctl) as AFAIK the web interface isn't supporting that (or at least last time I used it).
After looking into what you said you were totally correct:
First I needed to enable the IPv6 in the proxmox module (/etc/modprobe.d/local.conf)
and after added the following to /etc/sysctl.conf
followed by sysctl -p
and after doing this I am able to assign a block per OpenVZ VM with its own DUID using your script.
Cheers for the help!