I just did a quick search on google, and looks like this may be a known issue.

http://www.mail-archive.com/wireshark-users@wireshark.org/msg00363.html

According to the mail, tcpdump also will behave the same way and they are waiting for a fix from Apple (no fix time estimate is given). I suppose those of us who use Intel based Mac may need to shout at Apple...

On Oct 29, 2006, at 11:13 AM, Eric Hall wrote:

On Sun, Oct 29, 2006 at 10:12:58AM +0800, Takashi Yoshida wrote:
Actually, I've seen this happen on my MacBook Pro as well and I do  
not have KisMac installed.
I didn't have much time to search or do anything about it but I was  
going to mention this on the list, but looks like Mike beat me to it.


Anyone with another flavor of recent x86 Mac seeing this
problem?
I don't have one to test with....


-eric

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Takashi Yoshida
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