i see how to use vpn with bt5r3

open the terminal and run below commands
apt-get install network-manager-gnome
cp /etc/network/interfaces{,.backup}
echo ""auto lo"" > /etc/network/interfaces
echo ""iface lo inet loopback"" >> /etc/network/interfaces
service network-manager start
nm-applet&
restart the machine


but is there a way to use l2tp with kali? i have not been able to find anything thus far.

thanks!