We have multiple 1242 AP's (LWAPP) communicating with a controller back at the main site over a T1 (1.5Mb) connection. When bandwidth utilization is very high (close to 100%), wireless clients seem to lose connectivity for a short time. Netflow output shows the access points talking back to the controller using UDP 12222 (Ether tunnel?). Are the UDP packets being dropped... which is affecting wireless clients? Do I need to implement QoS to protect the UDP traffic on the WAN link?