def __del__(self):
        print("Deconstructing " + self.devName)
           [...]
        sub.call(["ip", "link", "delete", self.devName])
        sub.call(["pkill", "dnsmasq"])
        try:
            os.remove("/var/lib/misc/dnsmasq.leases")
        except:
            "No dhcp leases to delete"