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+# Setting up IPv6
+
+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 two 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 :
+
+<div class="alert alert-warning" markdown="1">
+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.
+</div>
+
+```plaintext
+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 `ping ip6.yunohost.org`)
+- try to ping your server from your PC (assuming your PC has IPv6 enabled)
+
+If it's ok, it's ok !