More DoS information / a workaround
mike-hostap at tiedyenetworks.com
Mon Apr 5 11:34:21 PDT 2004
On Sun, 4 Apr 2004, Jouni Malinen wrote:
> On Wed, Mar 31, 2004 at 01:47:30PM -0800, mike-hostap at tiedyenetworks.com wrote:
> Do you recognize that MAC address? It would be useful to know if it one
> of the known devices in the wired or wireless networks. That seems to be
> 3Com device.
Yes I do. All of the cases I have noted, are from the wired side.
My testing shows this isn't in fact a DoS or being caused by received
802.11 frames, there's just a screwey interaction with bridging going on
here. So all that weird stuff I posted sooner wasn't anything more than a
> > How is crimini's name could we get 573 packets per second???
> This is clearly unwanted behavior from the driver, so I changed the
> current CVS snapshots to at least limit the rate of those messages.
That's probbly a good idea.
I've done more testing and I can't seem to reproduce this problem
with a single card version of my ap running the identical software load as
my problem child. The problem child is an AP that has two cards (seano 200mw's both
with 1.1.0/1.8.0 firmwares). Bridge 'br0' contains wlan0, wlan1 and eth0,
and the messages always are about mac addresses on the eth0 side. The wlan
interfaces each have different SSID's and wep keys (so there couldn't be
any kind of loop on the wireless side) and neither interface is
configured to associate as a client on the same channel, either.
Is it possible there could be a problem with having hostap drive
two cards at the same time? I have an ap with dual cards running 0.1.2 but
in that configuration (and for legacy reasons), I have wlan0,eth0 in a
bridge, and wlan1,eth1 in a different bridge.
While writing this I just went into my problem child and
configured it the same way (different bridge groups for each wlan
interface) and the problem still occurs. So I dunno....
More news later..
(I'm not rakin' on the software Jouni, thank you for all of your hard
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