532 routerboard (2.9.27)+ 2 Atheros 5413 wireless card (ap bridge, 2.4 Ghz B) - default
Bridge1 = LAN + 2 wireless atheros 5413
IP for the LAN interface - 192…
Everithing works fine the AP-s Running there is the"R" in the wireless list. But sometimes, the “R” dissapier, and the clients disconnects, after I do a SCAN with the card the users reconnects, but only when I’m scan with the wireless card.
This strange problem appears other 5 MT config like this.
wireless_AP1;data from unknown device 00:02:…, sent deauth
Wireless_AP1;data from unknown device 00:0E, …sent deauth
Wireless_AP1;data from unknown device 00:4F…, sent deauth
wireless_AP1;data from unknown device 00:02:…, sent deauth (6 events supressed)
wireless_AP1 disconnected, extensive data loss
I don’t have an answer for your problem but I use the 5413 (two cards in each router board) and I have six rb’s working. No problems, in fact they are working alot better since I removed all sr2/sr5 cards from my system.
Given log entries mean,
packets from the clients are being dropped at the AP, because client
isn’t registred to the AP anymore (previosly disconnected from the AP
due to extensive data loss). The client should connect to the AP
again, but the client haven’t noticed yet that it has been disconnected.
Ok! thanks, but how can this be. There is no MAC authentication, everybody can access the AP. Why this happen? Bad configuration…Or something else. How could I prevent this connection lose???
Our builds are using MT 2.9.27 on Wrap.2C with the EnGenius EMP-8602.
It appears that when there is lots of noise (high traffic on designated channel or adjacent channels), these cards will behave strangely. Most notible is the deauth disconnect.
We have sniffed frames and have not seen any evidence of deauth attacks.
Earlier, we were seeing the systems actually shut down due to noise. We adjusted the noise-floor-threshold up to -92 and it appears to correct that problem (the reported noise floor is approximately -96), but the deauth disconnects seem to remain.
Problem does not appear to exist when using the SR2 which uses the AR5004 chipset. So for noisy areas we are recommending the use of SR2, but for areas that are relatively clean, the EMP-8602 seems to work fine.
It’s better for you to change antenna on the AP site or client site with bigger dbi or maybe you could try to change channel to see whether it helps or not.
Well I had this problem once… After I change frequency channel it is solved. I found out that my MT box too close with others antenna that point to other direction. And the frequency only space 10 Mhz. So beware off putting your MT Boxes. Do not too close with others.
