Update and install OpenVPN and EasyRSA

opkg update
opkg install openvpn openvpn-easy-rsa

Edit /etc/easy-rsa/vars and at the end of the file fill the variables

Generate the keys/certificates for OpenVPN

build-ca
build-dh
build-key-server server

Generate the keys/certificates for OpenVPN (18.06.1)

cd /etc/easy-rsa/
easy-rsa init.pki
easy-rsa build-ca
easy-rsa build-dh

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