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doc/pages/01.administrate/06.troubleshooting/04.ipv6/ipv6.md

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Setting up IPv6 docs
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IPv6 may work out of the box in many cases. But in some cases or some specific provider, you may need to tweak things manually to enable IPv6.

With a VPS from OVH

OVH give one IPv4 address and one IPv6 address for VPS but by default, only IPv4 is OK. The OVH's documentation is here : https://docs.ovh.com/gb/en/vps/configuring-ipv6/

Configure the DNS server

Here : https://yunohost.org/#/dns_subdomains

Configure the server

On the OVH panel, you will copy 3 element :

  • the IPv6 address
  • the IPv6 gateway address
  • the IPv6 prefix. On OVH's VPS SSD, prefixes are /128 because you have only one IPv6 address.

On your VPS, create a backup of the network configuration with : cp /etc/network/interfaces ~/interfaces in home directory. Then, you can edit the configuration file (/etc/network/interfaces) with the following. It is assumed that :

In this example, it is assumed that your network interface is `eth0`. If it's different (check with `ip a`) you need to adapt the example below. 
iface eth0 inet6 static
address <your IPv6 address>
netmask <your IPv6 prefix>
post-up /sbin/ip -6 route add <the IPv6 gateway> dev eth0
post-up /sbin/ip -6 route add default via <the IPv6 gateway> dev eth0
pre-down /sbin/ip -6 route del default via <the IPv6 gateway> dev eth0
pre-down /sbin/ip -6 route del <the IPv6 gateway> dev eth0

Now, save the file and restart the network service with : service networking restart. (TODO : ideally we should find a way to validate the content of the configuration, otherwise it could fuck up the network stack and get disconnected from the VPS ?)

Check your configuration with these commands :

  • ip a to display network interfaces and addresses
  • hostname -I to display the system IP addresses
  • try to ping an IPv6 server (for example you can use ping6 ip6.yunohost.org)
  • try to ping your server from your PC (assuming your PC has IPv6 enabled)

If it's ok, it's ok !