Some questions
From: André Hallé (andre.halle_at_sympatico.ca)
Date: 06/02/03
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Date: Mon, 2 Jun 2003 07:10:23 -0700
Firstly i must thanks you for the time you spent to give me some explanation
using my ftp software behind my router.
But i'm a newbie in this, and i want to simplify and understand some of the
terms you use in your mail
According to FTP protocol, to download/upload, one of PORT and PASS is
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What is PASS ?
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issued to server by the client. For example, server listens at m/TCP for
ftp.
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m/TCP i don't know the meaning of m and on the base of TCP what is the ip ?
my very own ip like 64.228.93,110 for example or a local IP like
192.168.0.101 ?
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1. When PORT is used:
client issues : PORT A1,A2,A3,A4,P1,P2\r\n to tell server which
IP address and port client listens for the data channel. Then server bind
(m-1)/tcp, and connects to where client tells it.
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PORT A1, A2, P1, P2 means all kind of ports like 21-22
or specifics ports some define like an A others defined like a P ?
What is r and what is n ? m-1 ?
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2. When PASS is used, which is called passive mode:
client issues: PASS\r\n to server. Server opens a TCP port, and
sends a response which contains server'IP and the newly-opened port to
client. Client then opens a dynamic TCP port, and connects to server.
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Can you give me a command line used in a browser to explain me what is the
definition of PASS\r\n. Again r and n is not very clear for me.
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I suggest that you use a command line utilitie which tells you why fails,
what commands are issued, and what responses are received from server.
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Do you have some suggestion to give me on this kind of utilities ? I'm on
Windows 2000, and when you refer as command line i pretend that these are
command lines use in dos mode ?
____________________________________________
Our firewall called ITShield firewall provides powerful ftp proxy:
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Do i need a proxy server too to run FTP. I'm on a stand alone base, i mean
i'm not on a network. The first use of my router was to protect my PC of bad
intrusion.
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1. Firewall can listens on any tcp port for ftp, and redirect to any port
where the real ftp server listens;
2. You can disbale ls, put, dele, mkdir commands. You can create a
ls-disabled ftp server so that no one know what are restored on the ftp
server unless you tell him.
3. You can create a hidden directory. Everything under that directory can
not be seen.
Regards,
Ida
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Thanks Ida, and if you have some more moment, i would really like to have an
email from you explaining to me what's the meaning of some keys you use in
this message.
Regards
André
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