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IPv6 address, subnet mask

Each VPS is automatically assigned its own /64 IPv6 subnet by EDIS. An IPv6 address from the assigned subnet is statically preconfigured on the interface. To change the IPv6 address or add more addresses from the /64 assigned to your KVM, you’ll need to use a manual configuration. The network setup is dependent on the operating system in use. In Debian Linux you can work with the ip command.
Keep in mind that the subnet mask must be configured as /48 and not /64.
Configure an IPv6 address at runtime: ip -6 addr add 2a03:f80:ed15:435a::1/48 dev eth0 Display configured IPv6 addresses ip -6 addr show

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IPv6 default route (IPv6 default gateway)

To enable external IPv6 communication, a default route or default gateway must be configured. Configure an IPv6 default route ip -6 route add default via 2a03:f80:ed15::1
Every server location has its own IPv6 default route! Only use the address valid for your server location!
Display configured IPv6 default route: ip -6 route show