Re: Active vs passive FTP

Ken:
Thanks for the explanation

Carl Galgano
EDI Consulting Services, Inc.
540 Powder Springs Street
Suite C19
Marietta, GA  30064
770-422-2995
mailto: cgalgano@ediconsulting.com
http://www.ediconsulting.com
EDI, Communications and AS400 Technical Consulting

-----Original Message-----
From: SIMS, KEN <KSIMS@SOUTHERNWINE.com>
To: MIDRANGE-L@midrange.com <MIDRANGE-L@midrange.com>
Date: Monday, November 29, 1999 8:30 PM
Subject: RE: Active vs passive FTP


>Hi Jim -
>
>>Date: Mon, 29 Nov 1999 16:17:39 -0800
>>From: Jim Langston <jlangston@conexfreight.com>
>>Subject: Re: Ethernet x-over cable
>>
>>Hmm?  Please explain the difference between active
>>and passive modes of FTP.  I wrote an FTP client a few
>>years back on a PC in Delphi just to do it.  I got it working,
>>then abandoned it, I just wanted to see how it was done.
>
>I'll jump in here since I had to deal with this recently for a firewall on
>my PC at home.  As I understand, active vs passive only applies on gets,
>basically just file gets and directory lists.
>
>In both cases, the client sends the request to the server on port 21.
>
>In active mode, the server then initiates a data connection to the client
to
>send the actual file data or directory listing.  This is done on a port of
>1024 or higher.  If there is a firewall set to reject connections initiated
>by the other end, this is a problem.
>
>In passive mode, the client initiates the data connection to the server.
>This is done on port 20.
>
>For file puts, the client always initiates the data connection.
>
>Ken
>Southern Wine and Spirits of Nevada, Inc.
>Opinions expressed do not represent those of my employer or anyone else.
>
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