Ethereal-users: Re: [Ethereal-users] Problem while trying to capture raw 802.11 packet

Note: This archive is from the project's previous web site, ethereal.com. This list is no longer active.

Date Prev · Date Next · Thread Prev · Thread Next
Date Index · Thread Index · Other Months · All Mailing Lists
From: "Guy Harris" <gharris@xxxxxxxxx>
Date: Mon, 19 Apr 2004 13:31:41 -0700 (PDT)
Anish Chandran said:
> I was trying to capture raw data from 802.11 raw packets on Cisco
> Aironet card. i m working on linux 2.4.20. i did as said in the FAQ
> question number 5.36 ie
>
> echo "Mode: rfmon">/proc/driver/aironet/ethN/Config
>
> after this my network connectivity is lost, and when it is changed back
> to bss  i m getting connectivty back can any one explain why that is
> happening.

That is happening because the Aironet card (and, I suspect, most if not
all other 802.11 cards) are incapable of participating in an 802.11
network when they're running in monitor mode - or, even if, in theory, the
cards could do that, i.e. they could transmit packets, nobody's
implemented that in any drivers (it'd probably be a *lot* of work to do
that if it's even possible).  You must choose between having network
connectivity and capturing raw packets.