- Customer uses a sophos Wifi infrastruckter with a SG210 Cluster since 7 years- Models: AP50/AP55/AP/100/AP100X
- SSID with WPA2 PSK
- testing in 2.4, 5G and both together
- One Client starts at AP1, the other at AP2
- tested Firmware Version: 9.702-1 / 9.703-3 / 9.704-2
- the client devices, APs, network devices are pingable all the time from LAN network. There is no packetloss due roaming
- no features involved like client isolation and so on
- no matter if the ssid is bridge to AP-LAN or bridge to vlan
- due the movements each client pings the other one
- Sometimes the device will meet on the same AP
Initial:
(AP1)------------------------------------(AP2)
(Device1)---------------------------(Device2)
1st movement (communcation between Device 1 and 2 ok)
=============>(Device1) moving
=============(Device 2) stays and meet Device 1 on same AP
(Device2)<============= moving
(Device1)<============= moving
(Device 2) meeting (Device 1) on same AP
=============>(Device 2) moving
... connection is broken
Issue:
- After the parties have crossed each other, reside on the same AP one time and came back to their first location, they are unable to communicate
- This might happend after the second crossing sometimes
- this only affects wifi clients to wifi clients on different accesspoints in the same SSID
- What we figured out is, that one AP is filtering the ARP Replys between interface wlan11 and br-lan
- this could be seen by a tcpdump on the AP as shown on the pictures
- Wireshark Window on the Client (ARP)
- left shell tcpdump wlan11 (ARP)
- right shell tcpdump br-lan (ARP)
So from our point of view, the issue is located in the OPENWRT Firmware, because the packets get lost between the "wlan" and "br-lan" interface.
As we checked on the web, there are complains @ openwrt community about that issue.
Notes:
- This is reproduceable - we did it three times with different hardware.
- We know that this usecase is a little bit special.
- How we get that? At the customers site some robots are traveling through the factory and they have to communicate to each other by WiFi. So we have noticed a connection loss after some movements.
If you are interested, explore it yourself and report it to sophos, maybe they will solve it quickly
best regards Daniel
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