on toggle_vpn()
	tell application "System Events"
		repeat with s in services of network preferences
			if kind of s is 14 then -- 14 is VPN
				if not connected of configuration of s as boolean then
					tell s to connect
				else
					tell s to disconnect
				end if
			end if
		end repeat
	end tell
end toggle_vpn

Toggle VPN Connection

mac

AppleScript