Configuring your /64 IPv6 block

What you get

Every server has a routed /64 — for example 2001:db8:1234:5678::/64 — and a /56 is available free on request. The block and its gateway are shown on your server’s page in the client area.

Ubuntu (netplan)

Add the address and a default route to your existing file in /etc/netplan/:

network:
  version: 2
  ethernets:
    eno1:
      addresses:
        - "2001:db8:1234:5678::2/64"
      routes:
        - to: "::/0"
          via: "fe80::1"      # use the gateway shown in the client area
          on-link: true

$ netplan try                        # rolls back automatically if you lose access

Debian (ifupdown)

iface eno1 inet6 static
    address 2001:db8:1234:5678::2/64
    gateway fe80::1

$ ifup eno1 && ping -6 -c 3 2606:4700:4700::1111

Addresses for VMs and containers

With a /64 you can give each VM its own public IPv6 address: bridge the VMs to the host interface (Proxmox does this with vmbr0) and assign addresses from the block. Disable privacy extensions on servers so addresses stay stable.