Is Proxmox with IPv6-only VMs/LXC practical? (on OVH host)


New Member
Jun 5, 2022
Hello, I am evaluating using Proxmox on an OVH host with IPv6 only VMs and containers.

I am wondering if there is Proxmox-ish way to achieve this, ideally with GUI? Because there are many low-level hoops to jump through.

The host comes with a /64 range, using those addresses on bridges is fine, but for VMs/LXCs this fails because they declare a MAC, and OVH filters MACs it doesn't know.

It's possible to obtain a MAC from OVH by ordering an IPv4, and the IPv6 works for that MAC, even when not using IPv4, but that's a bit stupid.

To avoid exposing the VM MAC, I can use iptables, but it's a very manual and very low level tinkering of network config (risky).

Another issue is that the IPv6 range is tied to the host, so when moving the VM between hosts, its IP needs to be changed (and the iptables as well). The DNS record needs to be updated. Quite impractical to do by hand and never get wrong, esp. with hard to read/memorize IPv6...

Is there a way to have all (or most) of this handled by Proxmox?

I've had a look around, but it seems not, and this would require scripting which would somehow "compete" with what the Proxmox GUI could do, leading to issues down the road.
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