Eric,
You may need a patch.
:ftp.arpa
File Transfer Protocol [A0009R13] (C) Hewlett-Packard Co. 2000 [PASSIVE
SUPPORT]
ftp> help
FTP/XL commands may be abbreviated. Commands are:
: dir mget recv system
append disconnect mkdir remotehelp
timeout
ascii exit mode rename struct
binary exitonerror modtime replace
sunique
bye form mput reset trace
bytestream get open rmdir type
case hash prompt runique user
cd help put send
verbose
close lcd pwd site
passive
debug ls quit size
sendport
delete mdelete quote status ?
Additional help available on buildparms, ftperr#, ftpwarn#, ftpinfo#
ftp>
The correct command would be "passive".
-Craig
--- Eric Sand - STL <[log in to unmask]> wrote:
> Hi Jerry,
> Thanks for the info, it is well written. I have an FTP program on
> my
> MS2000 desktop called "FTP Explorer" that is freeware and I found the
> menu
> that toggles PASV on and off, I activated it and it works as
> described in
> your message with the Linksys router. Now if I could just get FTP on
> MPE/iX
> 7.0 to do likewise(PASV is not a recognized command) when I initiate
> a
> transfer from SANDBOX to the outside world..anyone from vCSY care to
> comment..is there a patch or could there be a patch?
>
>
> Thanks again....Eric Sand
> [log in to unmask]
>
>
> Eric Sand - STL ([log in to unmask]) wrote:
> : Hi Folks,
> : I have a question about FTP and its use with a Linksys router
> that
> : connects my home network with my ISP. I have discovered that FTP no
> longer
> : is functional on my home network, for the 918LX and my two MS2000
> desktops.
> : In the "port forwarding" Linksys screen I have port 21 coming in
> directed
> to
> : the 918LX, but as far as I can tell I have no restrictions on
> FTPing out.
> : When I attempt to connect to an FTP address from the MS2000 systems
> I am
> : prompted for the username and password on the target FTP server and
> I am
> : informed I have signed on, but there is no other response
> forthcoming such
> : as the results of a "dir" or "ls", and I am then disconnected. An
> outgoing
> : FTP server connection request on the 918LX returns with "Cannot
> connect to
> : host".
> :
> : What am I missing? I know this was working a short time ago, or
> so I
> : thought.
> :
>
> Can you set the FTP client to passive mode (PAV) ?
>
> http://www.practicallynetworked.com/support/pasvexplain.htm
> What is PASV mode?
>
> "This explanation is courtesy of Ted Ede.
>
> In active mode you talk to the FTP server, and ask for a file.
> Over that connection, the server says to you, "Okay, I'm going
> to
> send you a file, and I'm going to send it you over a new
> connection
> to Port X on your machine". X is from 1024 to 65535. Your
> client
> replies, "go for it".
>
> Now the FTP server tries to open that port, but speaking on a
> port
> that the NAT gateway would not be expecting a request on. So,
> all
> of a sudden your NAT gateway receives a request on Port X, and
> it
> does not know which machine on the your net that the packet was
> intended for, so it denies the request, and you don't get your
> file.
>
> On linux, ip_masq_ftp, a kernel module, can be loaded to fix
> this.
> Instead of blindly NATing away, it eavesdrops on the FTP
> protocol, and it knows in active mode that the server will reply
> to
> the client over the control connection with a port number which
> is
> contained in the *data* of the packet. When a reply comes in on
> this port, the ip_masq_ftp module tells the NAT code to route
> it
> to the correct client behind the gateway. You still need to
> open
> the firewall to all incoming ports, but only if the source port
> is
> the FTP data port.
>
> In PASV (passive) mode, port 21 is always initiated by the
> client
> for control and port 20 is always initiated by the client to
> receive data. This makes it NATable. Most FTP clients are set
> to
> Active mode by default and must be told to switch to PASV mode.
> It's kind of a misnomer to say the client is passive.
> Basically,
> it instructs the server to be passive, telling it, "Hey FTP
> server,
> don't get active on me! When I want the file, I'll open a
> connection to you and get it."
>
> So, you may be saying, why did they bother with this active
> baloney
> at all? Like everything invented in unix, there's more to it
> than
> meets the eye. Two properly implemented FTP servers can be made
> to
> work together from a third machine. Using the FTP control port
> from machine A, you can tell the FTP server on machine B to
> download the contents of a directory on machine C. This is
> basically how FTP mirror sites get updated."
>
> Also, what is the version of the Linksys firmware ? The release notes
> for 1.43, Sep 4,02, state:
>
> "Changed FTP client connection for stability."
>
>
> --Jerry Leslie (my opinions are strictly my own)
> Note: [log in to unmask] is invalid for email
>
> * To join/leave the list, search archives, change list settings, *
> * etc., please visit http://raven.utc.edu/archives/hp3000-l.html *
__________________________________________________
Do you Yahoo!?
Yahoo! Shopping - Send Flowers for Valentine's Day
http://shopping.yahoo.com
* To join/leave the list, search archives, change list settings, *
* etc., please visit http://raven.utc.edu/archives/hp3000-l.html *
|
