fulbond XI-1500 registration on cm9 AP but can't ping

any one can help us, i use cm 9 with MT 2.9.26 for AP, i tray connect wifi client fulbond XI-1500 (prism 2.5). i saw registration mac in wireless table in AP (cm9), i have correct ip addres. but can’t ping that wifi, i tray with another
wifi ex: senao cb3+ duluxe it work very well…
any one help me..
thanks a lot

.KD