Slow File Sharing

Windows Server 2008 SP1 Std. edition
Remote office server connected to datacenter via VPN Tunnel

Roles:
RODC
DNS
FILE Share
PRINT Share

Two NICS
NIC 1 connects to VPN Network
NIC 2 Connects to Internal Network at remote office

Problem:
File Sharing is extreamly slow.
We have rules out the network, and the VPN.  Check routing table, and verified all settings.  Updated all bios and firmwares, updated all drivers.

We are out of ideas!

Andre
TheITGuysAsked:
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TheITGuysConnect With a Mentor Author Commented:
FIgured it out today -

There are two onboard NIC's installed on the server both are Broadcom NetXtreme Gigabit Ethernet adapters.

After lots of trial and and much scanning with wireshark it came down to the setting for LSO (Large Send Offload) on the NIC's. This setting is enabled by deafult - LSO enabled, Jumbo Off.

From the Broadcom website

What is Large Send Offload?
Normally the TCP segmentation is done by the protocol stack. By enabling the Large Send Offload value, the TCP segmentation can be done by the Gigabit Ethernet Adapter.

By disabling this setting in the NIC configuration (using Broadcom Advanced Control Suite 3, you could also edit the properties on the NIC diretly using devince manager) file transfers are working just they way they should between the server and the workstations now.
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