Ethereal-dev: [Ethereal-dev] Protocol Identification

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From: Duncan Godfrey <d.j.godfrey@xxxxxxxxxxxxx>
Date: Mon, 18 Jul 2005 17:15:28 +0100
Would some be able to help me with a quick question, how does Ethereal identify FTP-Data packets - specificaly the ones which don't use either source or destination port 20 that is.
I have been going through the source but Im a bit overwhelmed and cant locate the section with the packet analysis. 

Thank you in advance for any help,

Duncan Godfrey