Yet another Hyper-V Ipv6 question

myhken

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)

myhken

Really nobody that can help me with this?

The newest status is that I have got my new IPv4 /28 subnet. Changed the settings in the internal NIC (it's gets on internet after I change the settings).
Then I created a new scope in DHCP, and all VMs gets IPv4 addresses, and gets online, so all that works.

But with IPv6 I'm not so lucky. Hetzner says:
Give the external interface the first address of the subnet ::1/128, with the gateway fe80::1 Give the virtual switch the second address ::2/64, without a gateway Give the virtual machines the following consecutive IPs and use the IP of the virtual switch as the gateway (::2)

I have done all that. The external interface uses 2a01:4f8:0000:0000::1/128 with gateway fe80::1
I have also used 2001:4860:4860::8888 and 2001:4860:4860::8844 as nameservers.
It is online, and I can connect on the IPv6 address from outside.

Give the virtual switch the second address ::2/64, without a gateway
Yes, I have given the subnet interface 2a01:4f8:0000:0000::2 with prefix /64, no gateway. check, done what they say.

Give the virtual machines the following consecutive IPs and use the IP of the virtual switch as the gateway (::2)

They gets IPv6 from the cope, all info is correct AKA IPv6, Gateway: 2a01:4f8:0000:0000::2 and I'm using Google IPV6 nameservers, that I also have put into the scope.

But I can't get on internet with the IPv6 network. Where is the issue?