redirect to an interface

Hi,

Is it possible to tell ipnat what interface to redirect a packet to?

The situation is as follow:

I have two bridged interface, B1 and B2, with no IP address

I have one interface I1 that has IP address.

Normally, all packets that come in B1 and are accepted by ipf will go
out through B2.

On certain rdr rules, I'd like the packet that come in B1 to go out on
I1. Even if I redirect to I1 IP address, the packet still goes out on
B2.

Any idea?

best regards,

olivier