Weird wireless issue

Hi all,
I have Asus laptop with Intel Pro/Wireless card 3945ABG network card running the latest drivers and I am connecto to a Netgear router.
My problem is that I have a 20MB internet connection and when I run a speed test ( www.speedtest.net) I get very odd results.
If i am wired directly to Modem - 19800MB
IF I am wired to the router - 15500MB
If my I use my wireless connection - 5400MB very very little.

I did the same test with a Dell Inspiron 6400 and I got same results but on the wireless test I got 15000MB. So something is wrong with my wireless connection but i dont know what. I unistalled the wireless card and drivers and Intel applications. reboot computer and it auto detect new hardware and installed using windows XP tool and still i get the same results. I have bring my router to factory defaults if case problem was with any IP routing but still I have no results. I tried with antivirus and firewall off anf the results are the same.

What can this be? Will I have to format my OS?

Any comments are appreciated.
Thanks alot.
Larbac

 

Start > Run > type: "regedit" without the quotes and then press enter.

Navigate to HKLM/system/current control set/services/tcpip/parameters

Right click in right pane, select: new > Dword value.

Name it exactly: TcpWindowSize (case sensitive)

Set value to: 256000 as a decimal. (change option on right from hex to decimal then type 256000 in box.)

Reboot and enjoy. It should help your wireless speed immensely.

 

What wireless card did the _Dell 6400 have?

 

Will it have any side effects? Works for every wireless card?

 

Yes it does work with any wireless card, it is a Windows XP issue. The default tcpwindowsize is too small for the high latency & error rate over wireless. XP's default size is designed, and works well for, ethernet.

The only side effect I have run into is some wireless routers will break the connection (motorola surfboard) with a large receive window. The tcpwindowsize setting determines how much info is received before an acknowledgement is returned (hey, I received that - send more!). If the router expects a small window size and doesn't get an acknowledgement it thinks the connection is broken. If it happens, just try a smaller window - perhaps 200K, then 150K, until the connection becomes stable. It's a night and day difference with wireless speed.

And, if it doesn't work, but it will, you can open the registry and delete the entry. No software has been installed.

 

The problem with connection is happening only on my PC. and only when wireless.. when i use the wired connection is working just fine..

Do you believe your suggestion will work if the issue is wireless only?

 

It will work precisely because the problem is only over wireless.