Ethereal-dev: [Ethereal-dev] how can it analyse the ftp stream while ftp port <>21

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Date: Fri, 17 Mar 2006 08:30:07 +0800 (CST)
the ftp sevice port is assigned to 300,ethereal can analyse the related date  as ftp and ftpdata protocol ?how can we tell ethereal to analyse the ftp data stream while its sevice port is not 21?why cant we find the ftp protocol in the list of  'preference' setup option ?how can we do it?
thanks.

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