On Aug 7, 2011, at 2:00 PM, Stig Bjørlykke wrote:
> * "Capture all in promiscuous mode" can be checked even if not all
> interfaces have this.
There is no API in libpcap to inquire whether an interface supports promiscuous
mode; before Michael and Irene's changes, "Capture in promiscuous mode" could
be checked regardless of whether promiscuous mode actually works.
Few OSes support asking whether a network interface supports promiscuous mode
(an interface can be told to go into promiscuous mode, and the drivers
generally just ignore the request if it makes no sense, e.g. on a PPP
interface); at best, libpcap/WinPcap could:
assume that any interface on a network that supports broadcasting (most
if not all 802.*, FDDI) supports it;
assume that most if not all others don't (e.g., PPP);
assume the "any" device doesn't or does, based on what Linux actually
supports;
for devices where we're not at the mercy of the OS and drivers, provide
a method to query that.
I.e., that's an interesting enhancement to consider, but there's no regression
from the old code.
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