Packet Loss Between Server 2008 and XP clients

Hello All.

I have recently deployed a new server running Server 2008. It is a DC as well as a File Server. It is running DNS as well as DHCP. The enviroment has another server in it running server 2003 which is also a DC as well as a Terminal Server. This client uses a VoIP set up that uses a client on the PC and a USB headset to answer the calls. The phone server software is installed on an XP machine.

After installing the new server, the PCs are apparently dropping calls and experincing lag in the software. The only thing in between the PCs and the server is a dumb 48 port switch.

Does anybody have any ideas as to a possible solution?

jmbowles01Asked:
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jmbowles01Connect With a Mentor Author Commented:
Does anyone have any other suggestions?
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FDiskWizardCommented:
First, check Duplex/speed on server and switch. Network Cable OK?
By Chance, does it have a broadcom NIC?
I ran into huge problems after Win2003 SP2 with Scalable Networking Pack turned on by default.
Also applies to 2008: http://support.microsoft.com/kb/951037

You can run this to disable:
    2003>: Netsh int ip set chimney DISABLED
    2008>: netsh int tcp set global chimney=disabled
No reboot required - applies instantly


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jmbowles01Author Commented:
Hi FdiskWizard.

The server does have a Broadcom NIC in it. They are running a brand new gigabit switch. Duplexing is set on all machines to 100 MB / Full. I ran the netsh command and will see if there is a difference. Any other ideas?
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FDiskWizardCommented:
Does the server have a Gigabit card? Why 100Mb/Full if that's they do?
Also, that article explained how to check if anything was being offloaded... but if you have already disabled it doesn't matter now.
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jmbowles01Author Commented:
Both servers are set to 1 GB auto. The clients are all set to 100 MB unless they are new and have a GB card in them. It does not appear to be a bandwidth issue however.
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