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I'm completely new to wireshark. I have Ubuntu on a Dell with wireless connection. When I go to Wireshark Capture Option, I cannot select any interface since no interface is listed. What is the problem and how can I fix that?

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You probably should check out the article in the wireshark wiki about capture privileges.

If this is a temporary setup you could just start wireshark with sudo. But this isn't really the best approach from a security perspective.

Also see the capturing on un*x section in the FAQ, it has some other things you should be aware of.

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You are so right. Running wireshark as root user give me access to all interfaces. I'm checking capture privileges right now. – Phuong Nguyen Feb 7 '10 at 3:27
I tried to set network privileges for dumpcap and everything is fine nows. Thanks. – Phuong Nguyen Feb 7 '10 at 3:31
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