we have setup wireless lan with 21 access points. all are linksys 54G.
we didn't do any special configuration.
all access points are in same network.
clients are getting IP from DHCP server.
problem is user moving with laptop from one access point to another access point but laptop is still connected to old access point(which is showing very low signal) althogh nearest access point showing excellent signal strength.
The wireless roaming is always controlled by the STA and not the AP. Check to see if there are any new driver versions for the STA cards. For example many people complained about the 2915ABG card that recently not roaming properly, or waiting until the last minute when the signal quality was very very poor, now Intel provided a new driver that allows you to control the sensitivity of the roaming.
Did you try disconnecting and reconnecting again at the spot where the switching of AP's is expected. And on reconnecting check if it associates with the AP at the far end still. This test should eliminate any other possibilities from the AP side which might pose an issue.