I also have an Apple Airport Extreme "N". Normally, I have the following on the wifi network:
-4 Apple computers
-1 N810 (with a SIP and a google talk account active)
-between 1 and 4 N800 (all with google talk accounts active)
-a Nokia N80 or E51 phone (sometimes with a SIP account active)

I don't experience reboots usually. Youtube works. I rarely use torrent, and never on the Nokias.

I did experience reboots once, while I was testing videoconferencing between one of the Apple notebooks and the N810 over google talk. I described what happened during the test here at the time.

Jerome,

Thank you for your reply. Could I please post the values of the these variables found on your N800?

/system/osso/connectivity/IAP/wlan_sleep_timeout
/system/osso/connectivity/IAP/inactive_wlan_sleep_timeout


Maybe mine are just screwed up...
Thank you!

Mattia

These files do not exist. Don't you mean:
/var/lib/gconf/system/osso/connectivity/IAP/&gconf.xml
instead?

here there is an entry "timeout_wlan" with a value of 0 (zero).

If you mean to test the Wlan hardware values, these appear to be under /sys/devices/platform/wlan-omap



Still, I do not think that you are looking in the right direction. I would rather believe that the router resets when there is a problem with the firewall or port settings. With mine, it only reset when I tried that sip video connection, and sip tends to be relatively aggressive in opening tcp/udp ports. Torrent clients are also relatively aggressive in this respect and use of torrent is the main difference between your setting and mine. Keep in mind that the Apple router does not use upnp for its port settings, but bonjour.

Dear Jerome,

thank you! I apologize for my incomplete post. The variable I was referring to are set with the gconf command. After further analysis I understood that, usually they are absent in os2008, but they can override standard values. It actually produced a positive effect from a connection perspective, but the made the whole PWR save setting worthless. I tried to disable the port mapping function in the router but no luck. I-m so curious to understand what's going on with my gears (I got a new router from apple). It looks like it is a very peculiar problem and it is not fixable by my self, even with your support, but still I'm curious.

At the moment I just disabled the N800's wlan power saving (with the n82 it is working fine), but I'm still curious to find out the cause of this behavior.

Best regards,
Mattia


I found interesting links:
http://www.gossamer-threads.com/lists/maemo/users/18057
http://lists.maemo.org/pipermail//ma...ry/004092.html

Well, I've just flashed with Diablo... With standard Wlan PWR savings it is still producing the cras. But with "intermediate" settings it looks better (I've downloaded 3 youtube videos): but I need much more testing. If the solution is here, I'll be the happiest man in the Troubleshooting Forum.

P.S.
After 200MB i saw no crash. Looks like the maemo team has found a software workaround, but I want to be cautious.

Nice if it is working better... obviously the AE doesn't like the most aggressive power saving mode of N800?

More good to know info about WLAN power saving mode and operation:
http://www.icnp2007.edu.cn/files/ICN...Throttling.pdf

Maybe if someone knows where to download IEEE spec for the 802.11 standard and the PSM mode in particular... What would be interesting to know what is the maximum allowed sleep time, if there is any? (Isn't it really defined by the beacon interval that is set in the router?) Maybe changing the beacon interval to shorter time would help/solve the issue?

EDIT: Just found this from IEEE... not sure if it is helpful:
http://ieeexplore.ieee.org/iel5/4489...1/04489282.pdf

EDIT2: Paragraph 2.1 in this document seem to describe the PSM operation quite nicely:
http://info.iet.unipi.it/~anastasi/papers/wiopt04.pdf

You are not very easy to follow. Why do you insist that the problem has something to do with power savings? I never changed the power savings, and I can watch youtube, stream video (google talk or TV programs) and download to my content without router crashes.

Jerome,

Obviously not all have this problem... and as Matyas pointed out his router works too if N800 is the only device connected to it. When I did read through this thread I got into understanding that whoever had this router reboot problem was fixed by turning off (or changing...) the power saving setting in N800. Therefore it looks like the problem is related to the power saving mode.

The documents I linked give little bit more information how this mode (PSM) works. In AP standpoint the only real difference is that AP needs to store packets in its internal memory when N800 is in sleep state, and send them as a burst once N800 become awake. Depending how much the AP has internal memory for this operation, it could be that with lots of traffic and long sleep time (long Beacon interval) the AP may run out of its internal buffer memory. Then depending on the AP hardware/software implementation, the "buffer overflow" may trigger an Interrupt for its CPU to call Reset vector...

The sleep time can be changed by changing the beacon interval in the router. If someone can try to change that value to see if shortening the beacon time solve the problem, or lengthening it makes it worse... If so, then the out of memory explanation should make sense? No?

Dear All,

Thank you for your precious support. I would like to mention that Apple delivered a new firmware. After that I restored factory defaults and selected a specific and hidden option: g only mode. To do that you have to press option key (ALT) and click on the "Radio Mode" menu (in airport panel).

Also I selected WPA/WPA2 Personal (before was WPA2 only).

Now it looks working, so the incompatibility may reside in the mixed environment where the n and g saving power options can produce a buffer overflow.

Best Regards,
Mattia

References
http://www.macosxhints.com/article.p...80415163013760

P.S.
This is not the behavior that a serious router should have...