Subject: Re: wi losing carrier under load?
To: Charles M. Hannum <abuse@spamalicious.com>
From: Steven M. Bellovin <smb@research.att.com>
List: netbsd-users
Date: 08/02/2004 20:34:22
In message <200408030329.43387.abuse@spamalicious.com>, "Charles M. Hannum" wri
tes:
>On Tuesday 03 August 2004 02:49, Steve Bellovin wrote:
>> On a 2.0 beta machine, I've been trying to run my wi card -- a Lucent
>> card -- in promiscuous mode while tracking down some infected Windoze
>> machines.  The network here at the IETF meeting is quite busy; possibly
>> as a result, the card frequently drops and reaquires carrier.  (I have
>> some patches by David Young that let me monitor that card via ifwatchd,
>> so I see all of the transitions.)
>
>I'm not sure about the Lucent firmware, but I know that the Intersil firmware 
>has a tendency to get very slow and moderately unusable when promiscuous mode 
>is enabled.  I looked at it about a year ago and it does not appear to be a 
>driver issue.
>
Certainly possible, though I seem to recall not having this problem a 
couple of years ago.  I was wondering if it might have something to do 
with interrupt overhead or processing, but I have no evidence that it 
isn't the firmware.

		--Steve Bellovin, http://www.research.att.com/~smb