On Sun, Jun 27, 2021 at 12:48 PM David White via Users <users@ovirt.org> wrote:

Hello,

Hi,

Reading https://www.ovirt.org/documentation/administration_guide/index.html#IPv6-networking-support-labels, I see this tidbit:
Dual-stack addressing, IPv4 and IPv6, is not supported
Switching clusters from IPv4 to IPv6 is not supported.
If I'm understanding this correctly... does that mean I cannot run some VMs with IPv4, and other VMs with IPv6, in the same cluster?

This applies mostly to host networking, there are cases when host networking dual stack works fine, the issue is that it has many quirks.

oVirt cannot ensure that those quirks won't happen which might break your connection.

In VM networks oVirt cares only for L2, with OVN it can also care for L3. So configuration on your VM networks is up to you.

I can imagine that you could safely mix IPv4 and IPv6 for VM networks without breaking any hosts, but I did not try that personally.

If so, that's incredibly disappointing and frustrating.

Is Dual-stack addressing a possible feature request?

You can fill RFE but I am afraid that it won't get far due to lack of manpower.

IPv4 addresses are expensive... and I have a couple of customers who only needs IPv6, so would really prefer to avoid having to pay for IPv4 addresses for them.

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Regards,

Ales

Ales Musil

Software Engineer - RHV Network

Red Hat EMEA

amusil@redhat.com IM: amusil