Wpa supplicant/Setup for dhcpcd as network manager

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Emerge wpa_supplicant (Version >=2.6-r2 is needed in order to get the CONFIG_MATCH_IFACE option added in April 2017.)

root #emerge --ask net-wireless/wpa_supplicant

Complete its conf.d file with the -M option for the wireless network interface:

FILE /etc/conf.d/wpa_supplicant

wpa_supplicant_args="-B -M -c/etc/wpa_supplicant/wpa_supplicant.conf"

In case authentication for the wired interface is needed this configuration file should look like

FILE /etc/conf.d/wpa_supplicant

wpa_supplicant_args="-ieth0 -Dwired -c/etc/wpa_supplicant/wpa_supplicant_wired.conf -B -M -c/etc/wpa_supplicant/wpa_supplicant.conf"

With the configuration done, run it as a service:

root #rc-update add wpa_supplicant default

root #rc-service wpa_supplicant start