On Tue, 18 Mar 1997 07:45:16 -0500 
 Matt Thomas <matt@lkg.dec.com> wrote:

 > Why do you nedd promiscous mode?  Use SIOCADDMULTI to enable the
 > ab-00-00-02-00-00 multicast.

SIOC{ADD,DEL}MULTI are not currently exported-to-userland sockios.
The reason for this is because consistency with the in-kernel IP multicast
code would be very difficult to maintain if you allowed users to
directly manipulate the multicast address filter of the interface.

Jason R. Thorpe                                       thorpej@nas.nasa.gov
NASA Ames Research Center                               Home: 408.866.1912
NAS: M/S 258-6                                          Work: 415.604.0935
Moffett Field, CA 94035                                Pager: 415.428.6939