HW address w/o connection in iphlpapi

[Juan Lang]

> Dang. It doesn't work for down devices.
> When I run strace on a program
> that uses getifaddrs, the socket is opened with IPROTO_IP:
> 
> socket(PF_INET, SOCK_DGRAM, IPPROTO_IP) = 14
> ioctl(14, 0x8912, 0x2084d3a8)           = 0

That's SIOCGIFCONF.  So it looks like getifaddrs isn't doing anything
different than SIOCGIFCONF, at least on Linux.

> I can't figure out what these ioctls are either...?

Take a look at <linux/sockios.h>

> I'll keep digging, but if you have any clues I would love to hear them!

ifconfig -a reports down interfaces.  It may just process /proc/net/dev.

--Juan

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