How to configure an IPv6 subnet on a Dedibox running Linux

How to configure IPv6 on Debian

1. Open the network configuration file /etc/network/interfaces in a text editor and edit it as follows:

   auto eno1
   iface eno1 inet6 static
       address IPV6ADDRESS
       netmask PREFIXLENGTH
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   Remember to replace eno1 with the proper Internet interface name.

2. Restart the network:

   sudo systemctl restart networking.service
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How to configure IPv6 on Debian without systemd

If you do not want to use systemd to start your services, use the following configuration.

1. Open the network configuration file /etc/network/interfaces in a text editor and edit it as follows:

   iface eno1 inet6 static
       pre-up modprobe ipv6
       pre-up dhclient -cf /etc/dhcp/dhclient6.conf -6 -P -d -v $IFACE
       address IPV6ADDRESS
       netmask PREFIXLEN
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   Adapt the interface name (eno1) to your needs, as well as the IPv6 address and the netmask.

2. Restart the network:

   sudo systemctl restart networking.service
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How to configure IPv6 on Ubuntu

Ubuntu uses netplan since the release of Ubuntu 18.04 LTS as network configuration tool. It replaces the classical network configuration with new configuration files, written in YAML format, and located in the /etc/netplan directory. For more information regarding netplan, refer to the official documentation.

1. Open the default configuration file /etc/netplan/01-netcfg.yaml in a text editor, and edit it as follows:

   # This file describes the network interfaces available on your system
   # For more information, see netplan(5).
   network:
   version: 2
   renderer: networkd
   ethernets:
       enp1s0:
       dhcp4: no
       dhcp6: no
       addresses:
       - "aaa.bbb.ccc.ddd/24" # The main IP address of your Dedibox server
       - "<IPv6_FROM_YOUR_BLOCK>/<SUBNETMASK>" # An IP address from your IPv6 block and it's subnet mask
       gateway4: aaa.bbb.ccc.1 # The gateway is the IP address of your Dedibox, ending on .1
       nameservers:
       addresses: [62.210.16.6, 62.210.16.7]
       routes:
       - to: 0.0.0.0
           via: aaa.bbb.ccc.1
           on-link: true
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   Remember to replace enp1s0 with the proper name of your Internet interface.

   Note:

   The configuration example above is valid for the main IP address of your Dedibox server. If you want to use IPv6 on a virtual machine, remember to use the unique gateway for the failover IPv4.

2. Check and validate your configuration file.

   sudo netplan –debug
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3. Activate the new configuration:

   sudo netplan apply
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How to configure IPv6 on CentOS

1. Open the automatically generated configuration file for your Internet interface in a text editor, for example /etc/sysconfig/network-scripts/ifcfg-eth0 and edit it as follows:

   # Generated by parse-kickstart
   UUID=xxxxx
   DNS1=62.210.16.6
   BOOTPROTO=none
   DEVICE=eth0
   ONBOOT=yes
   TYPE=Ethernet
   IPADDR=62.210.xx.xx
   PREFIX=24
   GATEWAY=62.210.xx.1
   DEFROUTE=yes
   IPV4_FAILURE_FATAL=no
   IPV6INIT=yes
   IPV6ADDR="IPV6ADDRESS/PREFIXLEN" 
   IPV6_AUTOCONF=yes
   NAME="System eth0" 
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2. Restart the networking service:

   systemctl restart networking.service
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