On July 20, 2019 at 9:22 AM, Eric Garver <egarver@redhat.com> wrote:

It likely means your kernel does not support IPv6 or the IPv6 for
netfilter/nftables is not enabled.

Maybe try a new kernel. Are you building your own?

Yes, I'm building my own kernels. Recompiling the kernel with IPv6 support did resolve the issue. Thanks a lot!

Hans