We must to know from which path the packet arrive, becouse we want to
return it throwt the same interface (that will potentialy travel in
different networks). But, additional, the most important thing is that
we want to send data in a specific interface.

How can we do that? is the best option to modify the sctplib
implementation, changing the send() call? (adding the interface
parameter)

thanks you for your time.
best regards.