I've just recently installed a fresh install of Windows 7 RTM on my new dual-quad-core rig with 16gb ram. I couldn't be happier overall, however, I'm having a horrible issue with networking on Windows 7. I've got VMWare workstation installed with 2 VM's running: Windows XP Pro and Windows Server 2003 Standard. I use the server VM for my test server for web development and I use XP as a "play around" machine so I don't screw up my primary workstation OS. I've got a network share from the Windows Server 2003 VM that I use as my connection to the test server from within Adobe Dreamweaver. It works, however, simply uploading a tiny .php file takes a few seconds. It used to be done in a flash on Vista with the same exact VM. I've also got a share setup on the Windows 7 machine that I've mapped on the Windows XP VM. I'm trying to copy data around and it's extremely slow. Showing more than 1 hour for 100MB transfer over a 100Mbit local network. Then I setup a share on the XP VM and connected to it from Windows 7. Then I started copying 100MB or so into the share from Windows 7 to XP Pro and it shows a horrible 19.6KB/sec transfer rate. When I transfer between network shares on the XP and Win2k3 server it works nice and fast as expected. I also notice when I open up task manager and switch to the Networking tab the Network Utilization never gets above .03%. Yeah, not even 1%. When I transfer files between the two VM's, though, the network utilization bounces around at 15% or so as expected. Any information on how I can troubleshoot this, or even better, fix it, would be greatly appreciated. Thanks!

I've come across this same issue on quite a few other forums (VMWare and Windows forums in general) and people who have this issue on Vista x64 seem to solve it by disabling "Large Send Offload" features on their network adapter. On Windows 7 I don't seem to have that option. When I go into my adapters properties, click Configure, then the Advanced tab I see the following: Adaptive Inter-Frame Spacing Flow Control Gigabit Master Slave Mode Interrupt Moderation Interrupt Moderation Rate IPv4 Checksum Offload Link Speed & Duplex Locally Administered Address Log Link State Event Piority & VLAN Receive Buffers Receive Side Scaling TCP Checksum Offload (IPv4) TCP Checksum Offload (IPv6) Transmit Buffers UDP Checksum Offload (IPv4) UDP Checksum Offload (IPv6) Wait for Link Nothing about "Large Send Offload". I tried disabling the Checksum Offloads I see there but that didn't help. :(

Interesting question. I have a similarly configured workstation doing basically the same thing except I'm using VMWare Server. I suffered through that problem for almost 2 years with Vista and never found the fix you mention. Now that it's too late, there's the fix. :) Now I am using Windows 7, like you, but I haven't noticed the problem since going to Windows 7. I thought that, maybe, they had finally fixed the network file copy issues. Apparently not.

Hi, If you have another physical machine, please also put it to this network and transfer files between the Windows 7 computer and this physical machine to see if the issue persists. Thanks.Nicholas Li - MSFT

Hi, If you have another physical machine, please also put it to this network and transfer files between the Windows 7 computer and this physical machine to see if the issue persists. Thanks. Nicholas Li - MSFT Yeah, I've done that. It seems to be a VMWare issue. As mentioned previously, their forums specify to fix the problem in Vista you need to disable "Large Send Offload" on the host machine's network adapter properties. In Windows 7, though, I'm not seeing that option in the list. I pasted everything that shows up earlier. Is Large Send Offload not included anymore in Windows 7 or is it just somewhere else or what..?? Everybody on the VMWare forums says that's how they fixed the problem in Vista. Some issue with Intel Pro NIC's and x64 based Windows systems. Again, though, I'm not seeing that option listed on Windows 7 even though I'm having the same exact problem they all described.

Hi, I also checked some related information about VMWARE and found the current version may not support Windows 7: VMware Workstation Features Please Note: Since the website is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information. For this issue, it is recommended that you contact VMWARE for further investigation. Note: Microsoft provides third-party contact information to help you find technical support. This contact information may change without notice. Microsoft does not guarantee the accuracy of this third-party contact information. Thanks. Nicholas Li - MSFT

I understand (and have confirmed by testing) that the problem is with VMWare. I've studied the issue and have gotten an answer from VMWare users regarding the problem on Windows Vista. Once again, the solution is to apparently disable "Large Send Offload" on the network cards properties. The problem is that Windows 7 doesn't seem to have that option in the list like Vista does so I've been trying to figure out whether it still exists, if it's called something else maybe, or what the deal is with that..?? So for the actual problem I will continue to research VMWare and their support options. However, for the basic question of what happened to Large Send Offload I'm still hoping for some help here. Thanks!

Hi, Please try this to disable "Large Send Offload" : 1. Open an elevated command prompt and press Enter: netsh int ip set global taskoffload=disabled 2. Disable and re-enable the network interface. 3. Run the following command in an elevated command prompt to confirm the command above is successful: netsh int ip show offload Hope this helps. Nicholas Li - MSFT

I have tried this here under Windows 7 v7600 installed on an IBM Thinkpad with an INTEL PRO/1000 MT NIC and disabled"Large Send Offload (IP4)". So, this option does exist and the speed of copying a 3 MB file over the network improved considerably!

I have tried this here under Windows 7 v7600 installed on an IBM Thinkpad with an INTEL PRO/1000 MT NIC and disabled"Large Send Offload (IP4)". So, this option does exist and the speed of copying a 3 MB file over the network improved considerably! Well where is it that you're finding that option? I'm looking under the Configure section of the NIC and I don't see it anywhere. As mentioned before, I tried disabling the checksum offload options and that didn't help.

Hi, Please try this to disable "Large Send Offload" : 1. Open an elevated command prompt and press Enter: netsh int ip set global taskoffload=disabled 2. Disable and re-enable the network interface. 3. Run the following command in an elevated command prompt to confirm the command above is successful: netsh int ip show offload Hope this helps. Nicholas Li - MSFT This worked!! Thanks so much. I'm not sure why I don't see it in the list like everybody else seems to but this way did the trick! Oh man what a difference. Thanks!

Sorry, my NIC - while also from Intel - is a different model, i.e. "INTEL PRO/1000 MT Mobile Connection" and it certainly does have that option "Large Send Offload (IP4)".Yours apparently does not have that option!

Hi all, I have the same issue, sometime fast, sometime very slow, I have tried many guides from Internet, but cannot fixed this problem, why so?

Same here.. have you reinstall?

A SOLUTION THAT WORKED FOR ME!!!!!!!!!! http://home.bott.ca/webserver/?p=226 Set your wireless card MTU to 1430