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RE: What is Passive mode anyway?



Some refinement; 	port 20 is ftp data
			port 21 is ftp
			port 23 is telnet

-----Original Message-----
From: Eric Richardson [mailto:eric@milagrosoft.com]
Sent: Monday, March 12, 2001 3:31 PM
To: Daniel de los Reyes
Cc: debian-user@lists.debian.org
Subject: Re: What is Passive mode anyway?


Daniel de los Reyes wrote:
> 
> Can somebody explain what Passive mode is, so maybe I can understand my
way out of this?
> 
ftp is bidirectional in that you go out on one port(21) and then the
server communicates back on another port(23 I think). Passive mode means
that it it a one port operation and the server doesn't have to connect
back to the client which with a firewall is problematic.

Eric :-)


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