Robert Smith wrote:
> I have two questions about wireshark usage:
> 
> 1. In the wireshark->capture->options dialog there are possibilities to 
> define multiple capture files and condition when to switch to the next 
> one. For example by size, every 5 MB start to save to new log file. My 
> question is whether the same thing  is possible to configure using 
> tshark from command line. As far as I know there is only option -w to 
> specify output file. So how to specify multiple output file using tshark?

See the "-b" option:

>      -b  <capture ring buffer option>
>          Cause TShark to run in "multiple files" mode.  In
>          "multiple files" mode, TShark will write to several
>          capture files. When the first capture file fills up,
>          TShark will switch writing to the next file and so on.


> 2. Ia m running wireshark under Linux Ubuntu 7.10 operating system. I 
> don't understand why but the Wireshark -> Preferences -> Protocols tab 
> is empty. I can't click on the plus sign next to word "Protocols" in the 
> Wireshark -> Preferences and open list of available protocols.
> 
> I tried to open Wireshark -. Preferences -> Protocols on my WindowsXP 
> computer and there I can see list of protocols (including IEEE 802.11) 
> without any problems. So it seems to me the problem is Ubuntu specific.
> 
> Could you advice what might be went wrong?

Hmmm, I don't have any good ideas about that.
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