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Full Discussion: PASV mode FTP
Top Forums UNIX for Advanced & Expert Users PASV mode FTP Post 86377 by jerardfjay on Thursday 13th of October 2005 03:17:54 PM
Old 10-13-2005
figured out the issue
To all who have been wondering if this was fixed or not. Here is the skinny.

Code:
Why PASV Poses Problems for FTP Servers on Internal Networks.

The other server-side problem that can occur is when a client is trying to access an FTP server on an internal network protected by a routing device.  Because a server response from PASV includes an IP address and port number, if this IP address corresponds to a private network then the client will not be able to connect to that private address.  From our PASV example above, we have:
Server:  227 Entering Passive Mode (172,16,3,4,204,173)
If left unaltered, the client would try to connect to port 52397 on the IP address 172.16.3.4.  If the client is not on the private internal network, the client would time-out trying to connect to that address, when in reality it should be connecting to the external IP address of the routing device.
Solution 1:  The network administrator of the server network can consult the routing device vendor's documentation to see if FTP connections can be dynamically monitored and dynamically replace the IP address specification for packets containing the PASV response.
Using our PASV example above, when the FTP server replies to the PASV request:
Server:  227 Entering Passive Mode (172,16,3,4,204,173)
The routing device should rewrite the packet like this, assuming the external address is 17.254.0.91:
Server:  227 Entering Passive Mode (17,254,0,91,204,173)
The remote client would then attempt to connect to the routing device at 17.254.0.91:52397. The routing device in this example would then forward all traffic for this connection between the remote client and the internal FTP server at IP address 172.16.3.4.

We have decided to pursue this alternative. This information is from the following URL

NC FTP Web site
 

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LEARN ABOUT DEBIAN

gftp

GFTP(1) 						      General Commands Manual							   GFTP(1)

NAME

       gftp - file transfer client for *NIX based machines.

SYNOPSIS

       gftp [options] [[proto://][ user : [pass] @] server [: port ][/ directory ]]

DESCRIPTION

       gFTP  is  a file transfer client for *NIX based machines. It currently has a text interface and a GTK+ 1.2/2.x graphical interface. It cur-
       rently supports the FTP, FTPS (control connection only), HTTP, HTTPS, SSH and FSP protocols.

OPTIONS

       You may enter a url on the command line that gFTP will automatically connect to when it starts up.

       --help, -h
	      Display program usage.

       --info Display some information about how gFTP was built. Please send the output of this command when submitting a bug report.

       --version, -v
	      Display the current version of gFTP.

       proto  This specifies the protocol that should be used. It can currently be one of the following options: ftp, ftps, http, https, ssh, fsp,
	      local and bookmark. If omitted, the protocol specified by the default_protocol option will be used.

       user   The username that will be used to log into the remote server. If omitted, your current username will be used for most protocols. For
	      the FTP protocol, the anonymous username will be used.

       pass   The password that will be used to log into the remote server. If omitted, you will be prompted for the password. If  you	are  using
	      the FTP protocol, and the username is anonymous, then your email address will be used as the password.

       server The remote server to connect to.

       port   The  remote port on the server to connect to. If omitted, the default port for the protocol will be used. The port will be looked up
	      in the services(5) file.

       directory
	      The directory to change to once you are connected to the remote server.

FILES

       ~/.gftp/gftprc
	      Per user configuration file. Most of these options can be edited inside gFTP. This file is also commented very well.   ~/.gftp/book-
	      marks
		     Per user bookmarks file.

BUGS

       If you find any bugs in gFTP, please report them to GNOME's Bugzilla at http://bugzilla.gnome.org/

AUTHOR

       Brian Masney <masneyb@gftp.org> - http://www.gftp.org/

								    MARCH 2007								   GFTP(1)
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