Hi, I have a UniFi AP (Atheros AR9561) that I flashed to OpenWRT (Bleeding Edge, 50108).  It works fine with my PC (a RTL8188RU wlan adapter) for the first few minutes, but then somehow it stops forwarding UDP/TCP/ICMP traffic.  I still see the LEDs on the access point blinking though, so I'm pretty sure the traffic is arriving on the access point.  The non-IP traffic (EAPOL) still gets responded ("Group rekeying completed" from time to time in the wpa_supplicant log).

- To eliminate possible routing table issues, I've tried to ping the access point on its link-local address, but it doesn't respond either.  Clearing the ip6tables doesn't seem to help.
- With wireshark I notice a lot of neighbour solicitations.  To eliminate possible NDP issues, I've put permanent neighbour entries in both the access point and the PC.  This makes the NDP traffic go away, but still no response to the outgoing ping requests.

When I try the other way around (ping from the access point to the PC on its link-local address), I see with wireshark that the PC is receiving the ICMP requests and responding to it, but somehow the "ping6" command on the access point still shows "timeout".  So I suspect that the traffic is somehow blacklisted or dropped on the access point, but I have no clue as to why/how (dmesg is empty).
This state doesn't recover;  the only way to get the link going again (for a few minutes) is to restart wpa_supplicant and force a new connection.

Does anyone have any suggestions on how I could debug this issue?  Any suggestions (even the silly ones) are welcome!

(Last edited by billcarson on 4 Sep 2017, 19:19)