Tomorrow I will get a /28 IPv4 subnet on one of my servers. Today, I have three VMs running on the server, but they all have just extra IPs (@Hetzner) so they are not using the subnet, only the external NIC. I can therefor also give them IPv6 addresses via my IPv6 /64 subnet.
Tomorrow, I will move all VMs to my new IPv4 subnet, created as a subnet on Hyper-V (internal). How can I "move" my IPv6 subnet to the internal NIC and still get online with the IPv6 addresses?
I have a /29 IPv4 subnet now, and when I try to add IPv6 to it, it will not get online, and none of the VMs on the subnet can use IPv6. I set the IPv6 addresses static.
My IPv6 info: 2a01:4f8:0000:0000::1/64 fe80::1 ffff:ffff:ffff:ffff::
Reading this guide from Hetzner, my setup should be this:
On the external NIC, use 2a01:4f8:0000:0000::1 /128 fe80::1 ffff:ffff:ffff:ffff::
On subnet NIC 2a01:4f8:0000:0000::2 /64 No gateway or nameservers.
Today this is working at the main server and the three VMs using External NIC. But not on any of the VMs using the subnet NIC
Will it work if I don't have any IPv6 settings on the External NIC, and use: 2a01:4f8:0000:0000::1 /128 fe80::1 ffff:ffff:ffff:ffff:: on the internal subnet NIC? Or what do I have to do to get IPv6 to work on VMs on the subnet NIC? I don't need to get DHCP for IPv6 to work (a bonus if I can get it to work), so long as I can set static IPv6s it's ok. (will only have a few VMS total on the server)
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