On Tue, Jul 11, 2000 at 08:05:20PM +0200, Ignatios Souvatzis wrote:
> I vaguely remember I fixed, or at least considered to fix, this, so that it
> should be possible now in the same way as you specify a outogoing interface
> for multicast packets.

I found in the cvs log of sys/netinet/ip_output.c:

Revision 1.64, Mon Dec 13 17:04:11 1999 UTC (6 months, 4 weeks ago) by is 
Branch: MAIN 
Changes since 1.63: +9 -4 lines
Diff to previous 1.63 

Handle packets to 255.255.255.255 like multicast packets. Fixes PR 7682 by
Darren Reed.

So I recall right. 

The method to select this from a program is something like

err = setsockopt(s, IPPROTO_IP, IP_MULTICAST_IF, (char *) &src_addr.sin_addr,
						    sizeof(src_addr.sin_addr))

It should be included in the upcoming 1.5 family of releases.

Regards,
	Ignatios

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