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[zucharn]

Connected to the router, I have my desktop via 100mbps ethernet, and my laptop connected with wireless n through the Intel 4965 card. Whenever I try to transfer a large file from my desktop to my laptop, the laptop's connection to the router disappears, and I'm subsequently unable to connect to any wireless networks until I reboot the laptop. The drop of connection occurs only when the laptop is connected through wireless. The loss of connection seems solely related to the time spent at high throughput, it doesn't matter the size of individual files, or the protocol used to transfer them, as I have tried using both windows file sharing and ftp.

I was in contact with D-Link tech support over the phone, and they had me lower the values for beacon interval, rts/cts, and fragmentation threshold. Doing this stopped the dropped connection, but my throughput dropped from 8MB/s to 1MB/s.

This issue has happened with three different laptops connected via N, running xp home, professional, and vista ultimate, although all three share the intel wireless card.

Is there any way that I can fix this or should I try to return the router?

Bit of extra information, the router is using 1.02 firmware and is hardware version A1. The drop of connectivity happens with any security mode, and in both 2.4 and 5ghz modes.

[Dragonslore]

What brand/model laptop are you running?

Does it have Intel Centrino?


Aside from that, here is something you can try with your DGL-4500

Try logging into your DGL-4500

Go to - Advanced > Advanced Wireless

Uncheck Short GI

Save Settings

See if this helps with your wireless problem

[zucharn]

Lenovo t61p, and I believe it is centrino.

[Dragonslore]

Reading through this forum, it seems the D-Link Extreme N has problems with Intel wi-fi chipsets.

As for the Router, here is the reason I recommended disabling the Sort GI

Short GIUsing a short (400ns) guard interval can increase throughput. However, it can also increase error rate in some installations, due to increased sensitivity to radio-frequency reflections. Select the option that works best for your installation.

As for your laptop, sometimes the manufacturer doesn't always use the most up to date drivers for the various hardware installed. So sometimes it's best to check the hardware manufacturer sites for the drivers. Or in some cases, some software may actually interfere with the operation of the hardware.

If you haven't done so yet, you might want try the latest Intel Proset drivers for your 4965 card.

[zucharn]

I've tried the drivers from both intel and from lenovo, and tried disabling short gi, and no solution. I tried a 4th laptop with an identical install of xp to mine, also using the 4965 card, and it worked ok.

[Dragonslore]

Taking the 4th laptop which worked OK, go to the Device Manager > Network Adapters > Intel 4965

Right click and select properties > Advanced, then check the various settings of the adapter.


Do the same with the other laptop which has the same wireless card and compare the settings.

Also take note of whether both laptops are using the same software to manage the wireless connection or if one is using say Intel Proset or some other software to manage the connection or if it's using windows to manage it.

If they are both using the same software to manage the connection, then check each setting on both laptops.


What ever you find different on the 4th laptop should hopefully be what is making the difference in your connection.

For all we know, it could be something else such as a security program or some other messing with it (I have no idea what is on your system for software). Maybe windows is putting the adapter to sleep? I always disable this in the adapter settings.


I don't know if I'm being of much help as remote help is not my strong point. I'm usually better off working directly on the problem system to find what's wrong and to fix it as I have trouble trying to direct others to diagnose and fix the problem.

[zucharn]

same driver, same settings, both using intel proset wireless, both laptops running identical installs of xp. Only difference is the one that works is a vaio sz650n, and the one that doesn't is a thinkpad t61p.

[Dragonslore]

Ouch!

Sounds like I would definitely need to be sitting at your system to find the problem with this one.

In the mean time, here's something you can check if the systems are running XP Pro or Media Center

Start > Run > Enter secpol.msc into the run box.

Do this on both systems at the same time so you can compare the network security settings.

Hopefully you'll find something here.

Good Luck

[zucharn]

I know what you mean about trying to troubleshoot remotely, it always feels sort of cumbersome. I don't have access to the laptop that worked right now, but I'll check for differences there. I checked the router's logs, and there's no new entries at the moments I get disconnected, except a couple times it has said that my laptop "deauthenticated" but a few things can happen after I disconnect, all requiring a restart. first was freezing for 4 seconds out of every five, second is just plain out freezing, requiring a hard reset, and third is just being unable to access any wireless networks or any settings in any way related to the wireless connection. This has happened using either wireless zero config or the Intel proset utility. I also can't get wps to work with the router.
I've spent so long working on this now that I accidentally missed the RMA window for the site I bought the router from. So now I'm not sure what to do.

Just tried again, my speeds seem very unstable at ranges below 10 feet, but become even beyond that. Took about a minute to fail this time, which is slightly longer than average. The intel proset utility is giving me "error applying profile" whenever I try to connect to a network. When I run the manual diagnostic tool, it fails the radio test, with the message that it can't get the radio's status.

[Dragonslore]

Well, I've really found this router to well worth the purchase, especially for the Dual active SLI & NAT firewall.

This router has been rock solid for me and I really punish it. About the only changes I made shortly after setting it up was this:

Disabling Short GI which did improve performance

Then under Advanced Networking I disabled these two items:

Allow Users to disable Internet Access

Allow Users to modify Virtual Server Mappings

I wasn't taking any chances on any hackers or worms messing up my router.

About the only time I had any problems with this router so far was yesturday. I had tried setting up the email settings so as to get the logs in my mailbox. This did work, but shortly after, the router ended up rebooting. it ended up rebooting about 4 or 5 times yesturday before I was able to get it to stop rebooting periodically.

But another thing that may of had something to do with this is this....

For awhile now, I've been noticing some blocked access attempts from foriegn addresses. I looked these up and the majority of these were from China. In otherwords, the Chinese hackers which are periodically in the news which the Chinese government denies supporting.

So what I did was to go through my logs looking for these chinese IP's and used dnsstuff.com to look them up so as to find entire blocks. I would then save the list of blocks to my text editor until I had gone through all the IP's from my log. I wasn't concerned with IP's from other contries, just China. After I finished, I used the Inbound Filters to add groups of these blocks and Deny Access.

After this, the Rebooting stopped and I haven't had any more rebooting since.

Although today, I have noticed a few more Chinese IP's that are from different blocks which I have not previously seen in my logs. Oh well, as I come across them, I'll do a Whois on the IP to find the Block itself, then check both above and below that block to make sure I have them all for that range.

This might be nothing more than a home network, but I sure as hell don't want to have any of my systems get infected and this router Rocks as a Security Appliance.

[zucharn]

yeah, I have NO issues with the router other than this dropping connection thing. Really bothering flaw in an otherwise flawless router.

[Lycan]

Have you tried disabling auto channel scan?
Locking the router to a specific channel.

[zucharn]

I have, trying in both 2.4 and 5ghz ranges. using the upper 5ghz bands seemed to help for a while, but I think it was a fluke.

[arod]

Also, keep in mind, Network conditions and environmental factors such as cordless phones running at 2.4ghz will cause wireless connections to drop.