Just recently my LAN file transfer speeds have gone to crap for my Vista Business 64bit machine. They used to be around 10 MB/s (80 mb/s) and are now about .5 MB/s upstream and .8 MB/s downstream.

I have disabled the differential compression setting already and have also applied that Hotfix that is supposed to help with file moves/copies/deletes. Neither have helped.

My Vista box is doing the file transfers with an Ubuntu box. I have tried my two Ubuntu boxes and they achieve the normal 80 mb/s on the same LAN.

All three boxes are connected to a D-Link 5port gigabit switch.

I would really appreciate any help or suggestions anyone could give.

EDIT: Problem solved. I am going to post my solution just in case anyone else runs into this problem.

I found out that my Ubuntu box was configured to be running at just 10MB/s instead of 100 or 1000. An easy way to tell the NIC settings on a Linux box is to use ethtool. To check your info, use:

sudo ethtool -s eth0

To change those settings, look up the man pages for ethtool.

Also, if you ever notice that your LAN file transfer speeds are about 500KB/s upstream and 800KB/s downstream, then your problem may be that your PC is running at correct speeds but the remote PC is running at 10mb/s.