Re: [Ethereal-users] why i receive only packets to and from my machinein wlan

["Doug Fox" <dfox138@xxxxxxxxxxx>]

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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