[Emile]

Well, that did succeed in bringing up the tun0 interface on boot at least:

tun0: flags=9843<UP,BROADCAST,RUNNING,SIMPLEX,LINK0,MULTICAST> mtu 1500
        lladdr fe:e1:ba:d1:3f:1a
        priority: 0
        groups: tun
        status: no carrier
        inet 10.100.2.106 netmask 0xffffff00 broadcast 10.100.2.255
        inet6 fe80::fce1:baff:fed1:3f1a%tun0 prefixlen 64 scopeid 0x4

But it hasn't change anything else. I tried to connect again but still no internet or anything.