New L2TP Connection profile

l2tp-add-config

#!/bin/sh
# https://askubuntu.com/questions/1167283/l2tp-connection-client-on-ubuntu-18-04-server
VPNDATA="
gateway = [ipv4],
ipsec-enabled = yes,
ipsec-psk = 0s"$(base64 <<<'[PSK]' | rev | cut -c2- | rev)"=,
mru = 1400,
mtu = 1400,
password-flags = 0,
refuse-chap = yes,
refuse-mschap = yes,
refuse-pap = yes,
require-mppe = yes,
user = [user]" 
nmcli connection add\
	connection.id [vpnName] \
	con-name [vpnName] \
	type VPN vpn-type l2tp \
	ifname \
	-- connection.autoconnect no \
	ipv4.method auto \
	vpn.data "$VPNDATA" \
	vpn.secrets password=[user-password]