How to Add an IPv6 Address to your Xen/KVM Linux VPS

This guide explains how to configure a static IPv6 address on common Linux operating systems.

You will need:

  • IPv6 Address: IPv6/64

  • Gateway: gateway address

  • Network Interface: eth0 or enX0 (replace as applicable)

Replace the above values with your actual details.

Ubuntu (18.04 / 20.04 / 22.04 / 24.04) – Netplan

Step 1: Identify the network interface

 
ip link

Step 2: Edit the Netplan configuration file

 
nano /etc/netplan/01-netcfg.yaml

(On some systems, this may be /etc/netplan/50-cloud-init.yaml)

Step 3: Configure IPv6 (latest Netplan routing method)

 
network:
  version: 2
  ethernets:
    eth0:
      dhcp4: true
      dhcp6: false
      addresses:
        - IPv6/64
      routes:
        - to: ::/64
          via: gateway address
      nameservers:
        addresses:
          - 2001:4860:4860::8888
          - 2606:4700:4700::1111

Replace eth0, IPv6/64, and gateway as required.

Step 4: Apply changes

 
netplan apply

Step 5: Verify

ip -6 addr show eth0
ip -6 route
 
 

Debian (9 / 10 / 11 / 12)

Step 1: Edit the interfaces file

 
nano /etc/network/interfaces

Step 2: Add IPv6 configuration

 
auto eth0
iface eth0 inet6 static
    address IPv6 address
    netmask 64
    gateway gateway address

Step 3: Restart networking

 
systemctl restart networking

Step 4: Verify

ip -6 addr show eth0
ip -6 route
 

CentOS / RHEL / AlmaLinux / Rocky Linux (7 / 8 / 9)

Step 1: Identify the interface

 
ip link

Step 2: Edit the interface configuration file

nano /etc/sysconfig/network-scripts/ifcfg-eth0
 

(or ifcfg-enX0)

Step 3: Add IPv6 configuration

 
IPV6INIT=yes
IPV6ADDR=IPv6/64
IPV6_DEFAULTGW=gateway address

Step 4: Restart networking

CentOS 7

systemctl restart network

CentOS 8 / 9

 
nmcli connection reload
nmcli connection up eth0

Step 5: Verify

ip -6 addr show eth0
ip -6 route

Temporary IPv6 Configuration (All OS – Not Persistent)

ip -6 addr add IPv6/64 dev eth0
ip -6 route add default via gateway
 
 

Note: This configuration will be lost after reboot.

Test IPv6 Connectivity

 
ping6 ipv6.google.com
 

Notes

  • IPv6 must be enabled at the provider level

  • Ensure firewalls allow IPv6 traffic

  • Network interface names may vary (eth0, ens3, enX0)

  • ipv6, xen, KVM, unified, storage
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