Introduction

At Fosdem wifi is Open and free. Each year + 6000 visitors are connected to it.
But one of the specific element is that they only allow IPv6

I remind that my Lenovo T14s is dual booting OpenBSD and GhostBSD

Let's see what parameters are required for both OpenBSD and FreeBSD

Parameter for OpenBSD

Let's start by the system I know the most ;).

You have first to identify which Wifi driver you have on your machine.

obsd:~ $ ifconfig -a | awk '/^[a-z]/ {iface=$1} /IEEE802/ {print iface " has IEEE802 capabilities"}'
iwm0: has IEEE802 capabilities

Since we are on IPv6, make sure that you have dhcp6leased up and running:

obsd:~ # rcctl enable dhcp6leased 
obsd:~ # rcctl start dhcp6leased

I can no more present the output of the scan command, but the wifi SSID is "FOSDEM"

obsd:~ # ifconfig iwm0 scan

Register to the WiFi access point:

obsd:~ # ifconfig iwm0 join FOSDEM

If I've correctly understood, thanks to the new dhcp6leased program, no extra actions are required.

Parameters for FreeBSD

We have to start rtsold:

fbsd:~ # service rtsold onestart

If you often face IPv6, you can enable rtsold for every boot by adding it in /etc/rc.conf

To join the access point, I did:

fbsd:~ # ifconfig wlan0 ssid FOSDEM

And that's it.