Wireshark-users: Re: [Wireshark-users] simple question
From: Guy Harris <guy@xxxxxxxxxxxx>
Date: Mon, 22 Aug 2011 12:36:17 -0700
On Aug 22, 2011, at 11:33 AM, János Löbb wrote:

> What am I doing wrong ?

As Bart Sikkes noted, what you're doing wrong might be typing "tcpdump" twice in a row - I get the same error on my Mac if I type "tcpdump tcpdump -c1000 net" at the command line.