Would you give it another go with AP isolation disabled? Just noticed that you have no WPA2/AES security set, could you also please enable and re-test? Other than AP isolation which is not enabled...

R1D2 wrote Can you in the meantime test with fixed channel, fixed ch width and exactly same settings for both AP modes? This is how both the CPEs in my testbed are setup...One AP, one Bridge with...

Right... ..the thing is however that all this would make perfect sense with CPE#3 - STA/CL being indeed active, however after performing tests between CPE#1 - AP and CPE#2 - bridge (w/ AP enabled)...

R1D2 wrote I meant the HNP is most certainly the cause for the disruption of the link between CPE#1 and CPE#2 if you change something at CPE#3 as described in your first post. Sending data from CPE#3...

I'm familiar with the Hidden Node Problem, but I'm willing to go fwd as CPE#3 has no real challenging setup / requirements and it occasionally needs internet access. So in effect I'm just testing out...

My topology is actually CPE510#1-AP <----> CPE510#2-Bridge <----> CPE510#3-CL/STA. CPE#1 has no LoS to CPE#3, so in undertaking this mini-project with CPE#1 and #2 already active for quite some time...