09-27-2005
PASV mode FTP
Hello,
We have a situation wherein the FTP connections from a Client over a secure connection like ANX, when using PASV mode file transfers, the server on our end is sending out an ip address as (0,0,0,0,0,0) for PASV mode. The first four numbers denote the ip address and the last two denote the Transmit and receive block size. The result of such a response from the server is preventing the client from receiving the data via the ip that the server sends back. The control port of the client seems to be working fine, so the client can login to the FTP server and issue commands that do not involve sending data back from the server like cd to a certain directory.
However whenever there is a command which involves getting data back from the server like ls the contents of the directory or get filename (since the session is a PASV mode file transfer, which we would like to be versus using active PORTS), the command hangs and eventually times out.
I would like to know what is the required setting on the server that determines the ip address that is sent back to the client inidcating the data port/channel the server is responding with when the client uses a PASV mode file transfer session. Any suggesstion/ideas/comments is much appreciated.
Thanks
Jerardfjay
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LEARN ABOUT ULTRIX
telnetd
telnetd(8c) telnetd(8c)
Name
telnetd - DARPA TELNET protocol server
Syntax
/etc/telnetd
Description
The server supports the DARPA standard TELNET virtual terminal protocol. The TELNET server is invoked when receives a connection request
on the port indicated in the TELNET service description.
The server operates by allocating a pseudo-terminal device for a client, then creating a login process which has the slave side of the
pseudo-terminal as stdin, stdout, and stderr. The server manipulates the master side of the pseudo terminal, implementing the TELNET pro-
tocol and passing characters between the client and login process.
When a TELNET session is started up, sends a TELNET option to the client side indicating a willingness to do remote echo of characters, to
suppress go ahead, and to receive terminal type information from the remote client. If the remote client is willing, the remote terminal
type is propagated in the environment of the created login process. The pseudo terminal allocated to the client is configured to operate
in cooked mode and with XTABS and CRMOD enabled.
Aside from this initial setup, the only mode changes will carry out are those required for echoing characters at the client side of the
connection.
The server supports binary mode, suppress go ahead, echo, and timing mark. It also allows a remote client to do binary, terminal type, and
suppress go ahead.
Restrictions
Some TELNET commands are only partially implemented.
The TELNET protocol allows the exchange of the number of lines and columns on the user's terminal, but does not make use of them.
The terminal type name received from the remote client is converted to lower case.
The server never sends TELNET go ahead commands.
See Also
telnet(1c), pty(4), tty(4), services(5), inetd(8c)
telnetd(8c)