http://bugs.winehq.org/show_bug.cgi?id=31994
--- Comment #34 from Bruno Jesus 00cpxxx@gmail.com 2012-10-23 12:34:12 CDT --- (In reply to comment #32)
Did you try with an interface-specific broadcast? Maybe that's the only time this happens.
The vb6 winsock component does not seem to be able to do that or is failing silently. I'll rewrite my tests in C later.