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?

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?

Thanks

       
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