This script lets you activate/inactivate VPN on edgerouter from a linux based machine. Configuration on how to set up rules in edgerouter is described in readme. But you need some kind of authentication to access your edgerouter, this can either be plain password (not recommended due to safety issues) or SSH Key. Shell file in this release uses plink (command line application from putty) and this can be configured with an ssh key from ppk file, how to do this on your linux machine can be found all over the internet.