This patch was in response to the Help I got regarding :
It is only active when one interface is configured : n_lan_addr == 1
I have tested the code here, and I can play a movie over the network.
The patch was created against the debian package minidlna-1.0.23+dfsg, but I think
it should be easy enough to apply in CVS.
If there is anything I can do to improve the patch let me know.