Slow network transfers (with 20 ISATAPS?!)

[tfield98]

I've been having some speed problems:

1. Vista gets only 8 Mbps at www.speakeasy.net/speedtest, but XP (on a different computer, same router) gets twice that: 16 Mbps.

2. Transfers between machines through a router run at 8 Mbps. I'd expect ten times that.

I've uninstalled & turned off all firewalls, virus programs, etc.

Looking in the device manager, I see over 20 identical ISATAPS. What reading I just did doesn't reveal to me why they'd be there. I suppose I can remove all but one of them, but I hate to start messing with this until I know what's going on.

Computer is a Dell Latitude D-820 w/ Broadcom NeXtreme 57xx Gigabit controller. D-Link DI-604.

Anyone have any suggestions on how to proceed?

TIA,

Tom

[midi2k6]

try to edit the registry file and patch TCP.sys, uncheck: Turn off for power saving on your NIC hardware

[tfield98]

try to edit the registry file and patch TCP.sys, uncheck: Turn off for power saving on your NIC hardware

Somehow both NIC cards had their "Link Speed" property set to 10 Mbps. Raising it to 100 Mbps almost fixed it. Now XP-to-Vista transfers are averaging 75 Mbps. But, Vista-to-XP transfers are maxing at 85 Mbps, but averaging only 25 Mbps. Lots of what I'd call "pulsing" on and off.

So, I'm getting close.

Although I've done a fair amount of hacking on the OS over the years, never touched TCP.sys. Can you provide a detail or two more on what you're suggesting.

[fizban2]

try this

Click Start, click All Programs, click Accessories, and then click Command Prompt.

2. At the command prompt, type the following command, and then press ENTER:

netsh interface tcp set global autotuninglevel=disabled

This command disables the Receive Window Auto-Tuning feature.

3. Try to make a non-HTTP network connection.

To turn back on

4. At a command prompt, type the following command, and then press ENTER:

netsh interface tcp set global autotuninglevel=normal

This command enables Receive Window Auto-Tuning again so that you can take advantage of the increase in network throughput performance that this option provides

the devices you connect to need to support this feature or you will notice a preformance hit. the tcpip.sys won't help you much in this situation. the ISATAP connections are for translation in IPV4 to IPV6 they won't be active unless you go into the netsh command and enable them.