Chris Mason wrote:
John,
If there has been any further chat about this I've missed it or maybe
Thanksgiving has quieted everything down for the long weekend.
I'm here just to make a quick comment over "interactive mode".
I guess this is a reference to the FTP connection over which commands and
responses are exchanged - and which, I believe, uses some cut-down version
of TELNET. This exchange is characterised by the use of port 21 on the
machine running the FTP server.
Simple use of the traditional FTP actually performs data transfers using
port 20 on the FTP server. I expect it can all get a lot more complicated
than this.
I know this well since, in a long forgotten flavour of AnyNet, the sockets
over SNA version which permi - I guess I'm obliged to use the past tense -
permitted a customer to run these wonderful IP-based programs over his
well-established, well-understood, well-ordered and predictable SNA network,
marketing people, check the bumpf if it's still to be found, always used the
TELNET port, 23, as an example of a port which should be mapped to the SNA
"interactive" class of service (COS) and the FTP port, 21, as an example of
a port which should be mapped to the SNA "batch" COS - which is rubbish, of
course. What they should have said - if there was an ounce of savvy among
them - is that port 21 should also be associated with the SNA "interactive"
COS and it's port 20 which should have been used as an example of a port to
be associated with the SNA "batch" COS.
Chris Mason
Again today the newsgroup server is obliging me to remove the "Original
Message". In essence, as far as this post is concerned, John Giltner, was
asking what "interactive mode" in connection with some flavour of FTP called
SFTP which is what the thread is really all about.
If someone knows how to get round this unfriendly behaviour of the server,
please let me know.
Chris,
Thanks, I know how ftp works, I just never heard it called "interactive
mode" before. Normally port 21 is the control/command
connection/session and "the other port" (number depends on if it is
passive or active) is the data connection/session.
As for the other problem I find that sometimes i can get the message
through if I remove the "For IBM-MAIN subsriber ... " text that is added
to the end of the posts.
John Giltner
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