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Windows 7: TCP/UDP checksum offloading

12 Feb 2010   #1

windows xp
TCP/UDP checksum offloading


i have a voip application. i tested it on Windows 7.

when i see the RTP packets with Wireshark, i see that every UDP packet originating from the Windows 7 machine has UDP checksum error, and Wireshark suggests that it might be caused of 'UDP checksum offload'.

i received a bad/broken voice quality, i've tested in xp and it runs well.

what i want to ask are.

is TCP/UDP checksum offloading is enabled by default in Windows 7?
is there any other way to enable/disable this feature than setting it in the Registry?

or is this has something to do with the network interface driver? since i read that TCP/UDP checksum offloading let the network interface card to do the TCP/UDP checksum calculation, so that the packets will have a correct TCP/UDP checksum when they're sent on the wire. if that's right, i think that i shouldn't experience a bad/broken voice quality on the other side.

Thank you.

My System SpecsSystem Spec
12 Feb 2010   #2

Windows 8.1 Pro (x64)

See if updating the driver your your network card fixes the problem.
But....Registry switches: Using Registry Values to Enable and Disable Task Offloading
My System SpecsSystem Spec

 TCP/UDP checksum offloading

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