RE: Remote AS/400 support over the internet

Mandy,

Now that is a statement I can agree with.  SNA sessions start with a
"machine to machine connection".  Then you establish a "program to program"
connection.  The next "program to program" connection will operate over the
"machine to machine" link if it is still active.  The machine to machine
connection will not be dropped until the last program to program session is
closed.

Where as TCP/IP is does not have the machine level connection.

Bob

-----Original Message-----
From: owner-midrange-l@midrange.com [mailto:owner-midrange-l@midrange.com]On
Behalf Of mandy.shaw@uk.catalyst-solutions.com
Sent: Tuesday, March 13, 2001 6:52 PM
To: MIDRANGE-L@midrange.com
Subject: RE: Remote AS/400 support over the internet

You're absolutely right where you're in control of the sockets in question,
of course - but if you're running a standard client/server TCP/IP app like
Telnet, the fact that you've opened a Telnet session in one direction will
be of no assistance whatever to an attempt to do so in the opposite
direction - unlike with an SNA dial-up link where establishing the first
session, in whichever direction and for whichever APPC application, makes
the switched link go ACTIVE, and other apps initiated in either direction
can then piggy-back on it. That's all I meant.
Mandy





"Bob Crothers" <bob@cstoneindy.com> on 13/03/2001 18:53:57

Please respond to MIDRANGE-L@midrange.com

To:   MIDRANGE-L@midrange.com
cc:    (bcc: Mandy Shaw/Pacific/UK)
Subject:  RE: Remote AS/400 support over the internet




I question your statement about not being able to do 2-way sessions
like SNA ones with TCP/IP.

What do you mean?  We use TCP/IP a lot in our products and have no
problems with 2 way communications.  In fact, the connection between
our server and the AS/400 used to be APPC over SNA and is now TCP/IP.
Yes, some changes where required, but with the use of a SPECIAL file,
the program hardly knows it.

Note: We are NOT using "standard" conversations like Telnet, HTTP, etc.
But then, APPC does not follow a standard conversation protocol either.

Regards,
Bob Crothers
Cornerstone Communications
http://www.cstoneindy.com




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