def destroy(update_collection=true)
      return if new_record?
      previous_name = name_changed? ? name_was : name
      parent.modify_engine do |nat|
        nat.remove_redirect(previous_name)
      end
      parent_collection.delete(self, true) if parent_collection && update_collection
      new_record!
      true
    end
def destroy(update_collection=true)
      return if new_record?
      previous_name = name_changed? ? name_was : name
      parent.modify_engine do |nat|
        nat.remove_redirect(previous_name)
      end
      parent_collection.delete(self, true) if parent_collection && update_collection
      new_record!
      true
    end
Destroys the port forwarding mapping.

 @return [Boolean] True if command was successful, false otherwise.