Create ipv6.md

ipv6.md

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+# Guide to setup IPv6 on your server.
+
+## 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
+And you need the prefix. On OVH's VPS SSD, prefix are /128 because you have only one IPv6 address.
+
+On you're VPS create a backup of the file with : ''cp /etc/network/interfaces ~/interfaces'' in home directory.
+Then, you can edit the configuration file (''/etc/network/interfaces) :
+
+    iface <you're interface name, e.g 'eth0'> inet6 static
+    address <you're IPv6 address>
+    netmask <you're IPv6 prefix>
+    post-up /sbin/ip -6 route add <the IPv6 gateway> dev <you're interface name, e.g 'eth0'>
+    post-up /sbin/ip -6 route add default via <the IPv6 gateway> dev <you're interface name, e.g 'eth0'>
+    pre-down /sbin/ip -6 route del default via <the IPv6 gateway> dev <you're interface name, e.g 'eth0'>
+    pre-down /sbin/ip -6 route del <the IPv6 gateway> dev <you're interface name, e.g 'eth0'>
+
+Now, save the file and restart the network service with : ''service networking restart''.
+
+Check your configuration with these commands :
+- ''ip a'' to display address with interfaces
+- ''hostname -I'' to display address of the system
+- do a ping to a IPv6 serveur (for example you can use yunohost.org)
+- do a ping on your PC to your serveur
+
+If it's ok, it's ok !