Question about AP hopping
dcbw at redhat.com
Fri Jun 1 12:11:14 EDT 2007
On Fri, 2007-06-01 at 11:32 -0400, Aric D. Blumer wrote:
> Suppose that I have two APs, fairly close to each other. They have the
> same SSID but are on different channels. One is set to have low power
> A network card running the hostap driver is associated with the
> low-power AP while the other AP is turned off. Then the other AP is
> turned on, and the card is able to scan both APs. It remains associated
> with the lower-power AP.
> As I walk away from them, I lose connection with the low-power AP, but I
> would expect a reassociation to occur to the higher-power AP. This does
> not occur. Isn't that how 802.11 supposed to work? Does anything need
> to be set in the hostap driver on the mobile device in order to
> reassociate to the other AP?
Depends on quite a few things. If the firmware does the roaming, it's
all up to the firmware. If you've specified a particular BSSID, then
the driver/card should hang onto that BSSID forever. I'm not sure if
hostap has driver-level roaming support, but if the firmware doesn't do
roaming for you (it's true that many do) then you'll need a userspace
tool to work it all out.
> Thanks for any insight you might have.
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