Invalid TCP Header Checksum?

I'm using WireShark (http://www.wireshark.org/) to debug a network problem I'm having viewing protected Quicktime streams, and I find that nearly every packet coming out of my iMac has an invalid TCP header checksum, 0x0000, instead of the correct value. What could be wrong?

Mac OS X (10.6.4)

Posted on Aug 13, 2010 2:33 PM

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6 replies

Level 9

62,386 points

Aug 13, 2010 3:00 PM in response to Larry Goldman

What does WireShark say?

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Aug 13, 2010 11:17 PM in response to baltwo

Invalid TCP Header, value 0x0000, should be 0xXXXX. Occurs on every outgoing packet.

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Level 9

62,386 points

Aug 13, 2010 11:22 PM in response to Larry Goldman

Then, try http://discussions.apple.com/category.jspa?categoryID=122

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Aug 15, 2010 7:42 AM in response to baltwo

This is not a QuickTime problem, it is a network stack problem: it occurs (apparently) for every outgoing TCP/IP transaction.

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Level 9

62,386 points

Aug 15, 2010 10:48 AM in response to Larry Goldman

Okey, dokey. Good luck.

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Level 1

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Aug 18, 2010 10:42 AM in response to Larry Goldman

Did you find out why the header checksum is invalid? The same is happening to me, not only with TCP but also with UDP packets.

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Invalid TCP Header Checksum?

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