Wireless-N hardware and software issues

Yep the 300N gear goes back to BBuy tomorrow. I purchased a V1 of the wrt54G hardware almost 3 years ago, it died last week. Figured I’d buy the latest and greatest and be all set for another couple of years.
Well I’ve had similar problems as the posters above have mentioned. I have dug a little deeper into some of my problems. I have 2 issues that are shows stoppers that are causing the returns. I purchased all 3 devices in the last week. WRT300N (router), WPC300N(notebook card), and WMP300N(PCI card).
The first issue has to do with DHCP. In the web admin application of the WRT300N take a look at the Status page - Local Network then click on DHCP table. When first plugged in the wrt300n shows the clients that have received DHCP addresses. After a while the WRT300N stops displaying the DHCP clients and their addresses, the WRT300N loses track of the DHCP addresses reservations. The WRT300N even started to hand out duplicate addresses on my network, causing some of my systems to not work on the network.
The second issue has to with wireless connectivity. I have a dell laptop with the 1350 WLAN card. The 1350wlan card has the Broadcom chipset, the same family that the WPC300N uses. I updated to the latest driver and utility from Dell for the 1350wlan card. I opened the status meter and leave it open so that I can watch the status as I work. I also start a continuous ping to the router. As I work I notice that I lose my connection to work, the problem is that the wireless network keeps dropping out. The ping to the router times out and the status meter shows disconnected. A way to verify if this is occurring to you that I found is to look in the event viewer(start -> run -> eventvwr) in the system log. Look for Tcpip source events repeating over and over. The message in the event will read like "The system detected that network adapter \DEVICE\TCPIP_{A4EAF2F4-B001-4635-86C4-703EFAB3C925} was connected to the network, and has initiated normal operation over the network adapter” These events were occurring to me every 10 to 20 minutes.
I will say the range with the wireless-n stuff is really good. I went and got another WRT54G router, it is version 6 of the hardware. The WMP300N has a much better connect and signal strength than the WMP54GS that I had.
I did come across 2 problems with the WMP300N. The first problem I found is with the utility that comes with the WMP300N. The wmp300n process bounces the CPU every second. Every other second the wmp300n process causes the cpu to spike to 80% or more utilization. This is just unacceptable in that it ruins performance. If you just install the wmp300N without using the software setup utility, and select the driver from the windows installation wizard the card works fine. You must manually configure the wmp300n using the windows wireless configuration utility though. The other problem involves the Broadcom wireless utility and the “SPROM validation format” the Broadcom wireless utility gets installed with the WMP300N software from the CD, it can be found in control panel. In the Broadcom wireless utility there is a diagnostics sections. When you run the diagnostics test, they fail every time for the “SPROM validation format”. I’m not sure what the “SPROM validation format” does, but it appears to not be necessary as the card works fine other than this.
As far as I can tell the WPC300N seems to have worked fine. It tested out OK when the WRT300N did not drop the wireless network.
One big note, when I bought my first wrt54g in august of 2003 it was version 1 of the hardware. It did not even have a version number listed, this is how you can tell version 1 hardware. In the 3 years of ownership I installed updated firmware 11 times. The first firmware version I updated to was v1.30.7. This was the 4th firmware release. It had a few issues at first also.

Searching my pants of and finally finding an issue that might solve the problems with the WPC300N let me share the info. In some thread there was mention of an older driver that solved problems with the wmp300n, I have ventured replacing the ar5416.sys driver with version 6.0.1.4, 1.015.808 bytes, 6-7-2006 that you can find here http://www.campbells.org/Download/wmp300nar5416.zip
And low and behold this one does the business, no more CPU spikes, no more excessive DHCP renewals, the speed is nearly always 300 (wrt300n v2 antenna's in 45 degree angles) and the link is really stable.
Ofcourse this only works if you have the Atheros version.
Replacing the driver is simple,
1. disable the LAN connection
2. stop the WPC300NSvc service3. copy /b %SystemRoot%\system32\drivers\ar5416.sys %SystemRoot%\system32\drivers\ar5416-old.sys
4. copy ar5416.sys %SystemRoot%\system32\drivers
5. enable the LAN connection
6. start the WPC300NSvc service

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