Ethereal-users: [Ethereal-users] Tethereal start capture question

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From: Janet Norton <cjnorton@xxxxxxxx>
Date: Thu, 29 Apr 2004 13:11:53 -0400
Can you define a condition which starts the data collection for tethereal?  
 
Currently, I am using a capture filter to get packets for specific IP traffic using a stop writing condition of 60 sec duration.
tethereal.exe -f "dst 149.59.152.28" -a duration:30 -w outfile
 
I have a perl script which continuously spawns the above process then reviews the outfile for when a specific ASCII string is present and processes data accordingly.  This way I can intercept IP data when it is present, but this is not very efficient.
 
I would like to start tethereal (or equivalent) with a condition to only start collect packets when TCP traffic is present for this IP only.  Any suggestions would be greatly appreciated.  This is on a small part of corporate network and I am collecting IP traffic to a barcode printer.
 
Thanks.