routing a broadcast over a gif tunnel

[Peter J. Blok]

Hi,

I need to fool a PC package. The package is searching for a server responding 
to a broadcast on port 56415.

That server is across an ipsec/gif tunnel. How can I bridge that particular 
packet towards the segment at the other end.

I have tried various ipfw fwd rules and ipfilter redirection, but none of them 
works (because the other segment is not locally available).

Peter