Hi,
sometimes the silence means that there's an answer.
Sometimes the silence is just to avoid to point out people's mistakes (and avoid to point out how badly their are thinking).
It's already the second time you ask the same question, so I'll reply.
SendRerrWhenNoRouteToForward - the name says it all. It is used to SEND the route error messages. The node originating the route request will RECEIVE the route error messages.
Please, try to use your brain and to understand how the protocol works.
T.