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Create a file /etc/netctl/c-base-crew.conf with this content (change $crewname and $password to your crew name and password):

Description='c-base crew 2.4ghz network'
Interface=wlan0
Connection=wireless
Security=wpa-configsection
IP=dhcp
IP6=static                                                                      
Address6=('2a02:f28:4::/64')                                                
Gateway6='2a02:f28:4::1'
Priority=2
WPAConfigSection=(
    'ssid="c-base-crew"'
    'key_mgmt=WPA-EAP'
    'eap=PEAP'
    'group=TKIP CCMP'
    'pairwise=TKIP CCMP'
    'anonymous_identity="$crewname"'
    'identity="$crewname"'
    'password="$password"'
    'priority=1'
    'phase2="auth=MSCHAPV2"'
    'ca_cert="/etc/ssl/certs/CAcert_Class_3_Root.pem"'
    'subject_match="C=DE, ST=Berlin, L=Berlin, O=c-base e.V., CN=wlan.cbrp3.c-base.org"'
)

Enable the profile with:

netctl enable c-base-crew

And start it with:

netctl switch-to c-base-crew

To use the 5GHz network -5ghz to the network and filename.