Forwarding in switch mode

[Николай Шульга]

Dear all,

I like tinc and am using it widely in the company I work for.
Currently I'm experimenting with 'switch' mode & have a problem with 
packets being forwarded.
I've tried possible combinations with next parameters:

a) Broadcast = direct
b) Forwarding = kernel
c) DirectOnly = yes

 From the documentation, it looks like (a) should be enough to stop 
packet forwarding between tinc nodes. But non of those parameters or 
combinations of them have helped me.
The target is: if we have Router_A---------Router_B----------Router_C,
A and C don't have direct connection, then B should not forward packets 
between them.
Please, if it's possible, those who knows a way to stop forwarding, give 
me an advice.

Tinc version - latest stable - 1.0.24

Thank you in advance.

N.Sh.