Ethereal-users: Re: [Ethereal-users] why i receive only packets to and from my machinein wlan
How can I find out if an adapter support promiscuous mode? Is there a
software able to do it? Any pointers are apprecaited.
Thanks,
----- Original Message -----
From: "Guy Harris" <gharris@xxxxxxxxx>
To: "Ethereal user support" <ethereal-users@xxxxxxxxxxxx>
Sent: Friday, July 01, 2005 12:33 PM
Subject: Re: [Ethereal-users] why i receive only packets to and from my
machinein wlan
jiang aimme wrote:
i used ethereal to capture wireless packets in red hat 9.0,i have used
"ifconfig wl promisc" and set my wlan card in promiscuous mode.
Ethereal will do that for you - in fact, *by default* it puts the adapter
in promiscuous mode (assuming the adapter supports promiscuous mode).
but why i receive only packets to and from my machine .
Perhaps your wireless adapter - or the Linux driver that RH 9.0 is using -
doesn't support promiscuous mode. Ask Red Hat about that.
For a wireless adapter, "promiscuous mode" seems to means "show me all
traffic received by the adapter's radio that's traffic on the network with
which the machine is associated". It will not, I think, capture other
traffic; you might have to go into monitor mode for that; see
http://wiki.ethereal.com/CaptureSetup_2fWLAN
for information on capturing on 802.11 networks, and see
http://wiki.ethereal.com/CaptureSetup_2fWLAN#head-83ad8510bbd3f22363d068e1c96f82fd0fcccd31
for details on putting the adapter into monitor mode on Linux.
Note that putting the adapter into monitor mode might cause it not to be
associated with a network, in which case the machine doing the capturing
won't be able to use the wireless network while it's capturing in monitor
mode. This refers to *any* use of the network - including doing
IP-address-to-name lookups with DNS or NIS or... - so, if you put the
adapter into monitor mode, you might have to disable IP-address-to-name
lookups in order to prevent Ethereal from hanging.
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