Wireshark-users: Re: [Wireshark-users] capture filter tcp port 20 and port 21

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From: Ulf Lamping <ulf.lamping@xxxxxx>
Date: Mon, 18 Sep 2006 13:03:35 +0200
> 
> i had tried this --> tcp port 20 or tcp port 21 and it works beautifully!
> 
> ulf, if i use active mode, would my data port be negotiated for every transfer?
> 

Sorry, don't know the FTP protocol too deeply, so I don't know when the fixed port and when other data ports are used,

Regards, ULFL
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