Berthold Seidel wrote:
Is there a problem with the command that should be issued by Ethereal to
the adapter or is something else wrong?
Yes, something else is wrong.
What's wrong is, apparently, Intel's claim on that page that "All Intel
PRO adapters and their software drivers support promiscuous mode." That
claim might have been true at the time they wrote that page - which was,
I suspect, a time before they had an 802.11 adapter, because I suspect
it was a time before 802.11 adapters existed, as it was probably a time
before *802.11* existed. The "10/100" suggests the epoch of that page....
Ethereal doesn't issue a command to the adapter, it just passes 1 as the
"promisc" argument to pcap_open_live().
On Windows, WinPcap, if it gets that argument, uses a particular NDIS
"filter" (NDIS_PACKET_TYPE_PROMISCUOUS) when setting up to capture from
the device; that "filter" requests promiscuous mode. For some unknown
reason, wireless card drivers on Windows do a *REALLY BAD* job of
handling requests to enter promiscuous mode - they either refuse, for
some mysterious reason, to supply any packets on the NDIS attachment
with promiscuous mode enabled, or supply only packets received by the
machine, not packets sent by the machine, perhaps because only the
description of NDIS_PACKET_TYPE_ALL_LOCAL (the "filter" used in
non-promiscuous mode) *explicitly* says "All packets sent by installed
protocols" (i.e., they assume that's the only mode that should supply
packets sent by the machine).
This is noted in the Ethereal FAQ:
http://www.ethereal.com/faq#q8.9
http://www.ethereal.com/faq#q8.10
As for the Zonealarm problem, for some reason, some networking kernel
code doesn't work well with WinPcap; the WinPcap developers might have a
better understanding why this is.
If there�s no other solution: Can anybody recommend a PCMCI adapter
(802.11b/g) that works reliably in promiscuous mode under XP?
Unfortunately, I can't (my main machine is a PowerBook, and OS X is a
UN*X, and handles promiscuous mode on its wireless adapter in a
reasonable fashion). I'm not sure *anybody's* discovered such an
adapter, although you might check the list of adapters mentioned in the
first of the FAQs.
