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[TwinLinked]

I have seen this post before and am having similar issues. The wireless portion keeps dropping every 30-60 minutes. The SSID still broadcasts you just cannot connect to it. If you change the channel or restart the router, you are able to connect again for 30-60 minutes.

I have tried all individual channels, reflashing the firmware, setting everything back to factory and still no luck. I took th router to my workplace and tried it there only to have the same problem. With little to no help from DLink support they eventually told me to take it back. Now I have a brand new one and the same problem!

At home I'm on Comcast with a Motorola Modem. I do have it set to mix B,G,N on WPA. QoS is off.
To make sure it wasn't interference or my modem I installed a Netgear D600 from work and had absolutely zero issues for the entire 2 days I had it running.

Any help would be appreciated. This seems to be more than an isolated issue.

[FurryNutz]

Try single mode G or mixed G and N?
What security mode are you using? WEP, WPA or WPA2? Preferred is WPA-Personal. WPA2/Auto TPIK and AES.
What wireless devices do you have connected?
Any cordless house phones?
Any other WiFi routers in the area?

Some other things to try:
Ensure DNS IP addresses are being filled in under Setup/Internet/Manual? You can find these under Status/Device Info/Wan section.
Turn off ALL QoS (DIR only) GameFuel (DGL only and if ON.) options.
Turn off Advanced DNS Services if you have this option under Setup/Internet/Manual.
Turn on DNS Relay under Setup/Networking.
Setup DHCP reserved IP addresses for all devices on the router.
Ensure devices are set to auto obtain an IP address.
Set Firewall settings to Endpoint Independent for TCP and UDP.

[TwinLinked]

Thank you, I will go through this check list when I get home tonight.

[Martin Blank]

I solved the issue by turning off .11n.  That is the culprit.  There's something in the firmware that's not handling .11n properly.  Even crowded wireless shouldn't cause problems like that.

[FurryNutz]

Before you assume it's the FW, you should do some trouble shooting.
Do you have alot of wireless routers near by?

What wireless modes were you using? Did you try Mixed G and N or Just Mixed All?

I solved the issue by turning off .11n.  That is the culprit.  There's something in the firmware that's not handling .11n properly.  Even crowded wireless shouldn't cause problems like that.

[Martin Blank]

I do this stuff for a living.  There are about a dozen nearby SSIDs.  Any setting that involves .11n results in failure after 30m to two hours.  The IEEE specs are quite clear that radios should work properly with interfering APs in the area.  Something is off, though I've not had the time to dissect the wireless frames to figure out what it is.

[FurryNutz]

if you have other WiFi routers near by then they could be a cause of your problems. Have you used InSSIDer application to see whats around?

What modes are you using? Mixed ALL? What happens with single mode G and single mode N. Notice any issues while using single modes? Try Mixed G and N?

My 657 works great on N mode however I only have about 3-4 routers near by me.

[Martin Blank]

No, I've used Kismet under Linux with an Atheros card, much as I do at work when I do site surveys for wireless installations.  As I said, there are about a dozen around me, several of which are running .11n.  It's not interference--it can happen at early hours of the morning where the overall level of wireless traffic is almost nil.  In any case, density like this shouldn't be a factor anyway.

If the router is having problems handling even the beacons from the surrounding routers, which is the source of the majority of wireless frames at those hours, something is definitely wrong internally.

[FurryNutz]

I would presume that your issues lie with the routers that are near by you. There is a guy over on the 855 forum having the same issues, A LOT of routers near by and even though the router is trying to find a good channel, there just isn't enough open and interference from the other routers is effecting his signal internally to his area.

Have you tried to lower the power out put of the router to see if this might help?

One thing I would do is to move the router to a friends or family place. See if the problem is traveling. Need to isolate the router of your current environment.

[Martin Blank]

The issue occurs when I connect devices to my network.  I have, for example, seen network failures when I connect my phone while streaming on my Roku.  Turn off the phone's WiFi and it resolves itself.  Phone, right?  Nope.  Power up my TouchPad and it does the same thing.  Sometimes, the Roku is off, and it happens when my girlfriend's notebook is connected and I connect my notebook.

Even if it were the presence of routers nearby, the 802.11 standard allows for that.  It even allows for a lot of them nearby, and .11n was written specifically with coexistence in mind (hence why it detects the presence of 20MHz APs and doesn't use 40MHz features around them).

I still have not had time to pin down the issue.  The fact that .11g works perfectly fine tells me that it's something in either the chip or the firmware covering .11n functionality, and it needs to get fixed.

[FurryNutz]

Does this happen over single mode N, auto channel scan enabled and disable?
Is WMM enabled?
ny other WiFi routers in the area? Use InSSIDer to find out.

And yes other router near by can and will effect other WiFi routers near by depending on how many are hear, frequencies and channels used. We are noticing that as more and more people get WiFi routers, specially in metro cities and in apartment complexes that even running N modes is having a problem due to the congestion of wireless radios and there all trying to broadcast singles and trying to maintain channels that are being used up. Yes the wireless standard allows for presence of other routers however when channels and freqencies are all being used up, then you start to run into problems.
Example:
http://forums.dlink.com/index.php?topic=41071.0

One thing you can try, take this router to a friends or family's place that had Internet. Hook it up and test with Single mode N.
Maybe someone can review your router settings with you using teamviewer.

Not try to say your wrong here or that there isn't a problem with the router. Just looking to troubleshoot here as much as possible.

[Olduvai]

I'm voting firmware.  I'm running inSSIDer now and there is one other wireless router in my neighborhood.  We're locking up every 15-20 minutes.  Following other poster's advice to disable .11N to see if it improves otherwise taking router back to the store.

[FurryNutz]

Ok, I'm testing my unit out as well on single mode N and will post results here.

Keep us posted on what Single mode G does.

[swetoast]

Been having dropping issues also been reading the threads on this forum trying the various recommendations given the problem i face is that i got a Wii that only got B/G and my netbook got N so ive tried running everything in G mode but that just increased the dropping also checked so i wasn't broadcasting on same channels as neighbours currently running without the QQS engine turned off since that damped the dropping

that's my experience so far didn't have that much problems with my old 655 router (except lighting kinda broke it )

[FurryNutz]

Try mixed G and N?
What security mode are you using? Preferred security is WPA-Personal. Try WPA/TPIK only.

Any cordless house phones?
Might manually set Auto Channel scan to a manual channel. Make sure your not broadcasting on an used channel. Try 1, 6 or 11 first.
Turn off Short GI and Extra Wireless Protection if you have it. Under Advanced/Advanced Wireless.

My 657 is set for single mode N, WPA2 and AES only. I have a iPhone and a wireless xbox that connects to it. Been working great. Seems like something in interfering with your maybe.