Ath9k in 4addr wds mode. After a while the station will break off. Station connectivity remains. But `ifconfig` cannot see any recv packet. wlan0 Link encap:Ethernet HWaddr C8:EE:A6:2E:60:D8 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:17402577 errors:0 dropped:0 overruns:0 frame:0 TX packets:33065526 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:1165838023 (1.0 GiB) TX bytes:51166664044 (47.6 GiB) RX packets count stop increase. /sys/kernel/debug/ieee80211/phy0/ath9k/recv PKTS-ALL : 21445223 BYTES-ALL : 2458906640 PKTS-ALL still increase.