After using Networkmanager and Wicd for a few years each I craved for a less complicated networking setup on my laptop. I did some reasearch and found that nothing outthere fits my need so I decided just to use the minimal basic setup.

systemd_networkd

I created a simple network file to use systemd to do the DHCP:

[Match]
Name=wlan0

[Network]
DHCP=yes

[DHCP]
RouteMetric=10

The Name tells systemd on which interfaces the config should be applied. _wlp*_ would also be valid The _DHCP_ Parameter should be selfexplaining. _ipv4_ would also be valid. The _RouteMetric_ tells systemd that any route announced by the DHCP Server should get this specific metric. I use a lower metric for any routes on my wired interfaces to force traffic to go through the cable if possible.

wpa_supplicant

Ofcourse wpa_supplicant is nessesay on Linux to use any kind of Wireless network. I use wpa_gui for the lazy hours to create the config for me. Writing/Editing the config manually is still needed sometimes

ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=network
update_config=1
ap_scan=1

network={
    ssid="karlsruhe.freifunk.net"
    key_mgmt=NONE
    auth_alg=OPEN
  #disabled=1
}

This is as simple as possible. ctrl_interface defines the socket on which wpa_ui or something simalar can connect to wpa_supplicant update_config allows wpa_supplicant to overwrite the configfile if nessesary. ap_scan tells wpa_supplicant to decide which network to connect to. It would be also possible to let the driver to that (ap_scan=0)

After a while I found out that wpa_gui creates the network config snippit with the disabled=1 parameter by default. This prevents wpa_supplicant from connecting to the network automatically if while by scanning. For most networks I disable this parameter manually.

wpa_supplicant.conf (5)