Re: AS/400 IP COMMUNICATION WAIT TIME -- MIDRANGE-L

I don't know Bob what would happen if I got a break message.  I was merely
stating my observation not trying to challenge you on your statement.  Heck
I really have no idea, just trying to learn from you guys.  Thanks for
sharing your knowledge.
cjg

Carl Galgano
EDI Consulting Services, Inc.
540 Powder Springs Street
Suite C19
Marietta, GA  30064
770-422-2995
mailto: cgalgano@ediconsulting.com
http://www.ediconsulting.com
EDI, Communications and AS400 Technical Consulting

-----Original Message-----
From: Bob Crothers <bob@cstoneindy.com>
To: MIDRANGE-L@midrange.com <MIDRANGE-L@midrange.com>
Date: Friday, January 07, 2000 11:48 AM
Subject: RE: AS/400 IP COMMUNICATION WAIT TIME


>Carl,
>
>What happens if a break message arrives or something else that causes the
>screen to change while you are unplugged?  My guess is that you get
>disconnected.
>
>Besides, I didn't say you'd loose your connection.  I was just talking
about
>the difference between UDP & TCP...or that was all I meant to be talking
>about <g>.
>
>Bob
>
>-----Original Message-----
>From: owner-midrange-l@midrange.com
[mailto:owner-midrange-l@midrange.com]On
>Behalf Of Carl Galgano
>Sent: Friday, January 07, 2000 9:42 AM
>To: MIDRANGE-L@midrange.com
>Subject: Re: AS/400 IP COMMUNICATION WAIT TIME
>
>Bob/Jim:
>Why then when I disconnect my laptop which is connected to my AS400 via IP,
>and move to a different office in my building and plug back into the
network
>that I still have the same session connect.  It never misses a beat?
>CJG
>
>Carl Galgano
>EDI Consulting Services, Inc.
>540 Powder Springs Street
>Suite C19
>Marietta, GA  30064
>770-422-2995
>mailto: cgalgano@ediconsulting.com
>http://www.ediconsulting.com
>EDI, Communications and AS400 Technical Consulting
>
>-----Original Message-----
>From: Bob Crothers <bob@cstoneindy.com>
>To: MIDRANGE-L@midrange.com <MIDRANGE-L@midrange.com>
>Date: Friday, January 07, 2000 8:41 AM
>Subject: RE: AS/400 IP COMMUNICATION WAIT TIME
>
>
>>Jim,
>>
>>You've got it mostly right.  Except the part about TCP being "Connection
>>Based".  It does not have to be that way.  Look at HTTP.  The connection
is
>>not maintained for the duration of the session.  Only while data is being
>>exchanged.  Other protocols/applications are different.  Telnet is
>>connection based.  FTP is actually both.  The control part of the
>>conversation is connection based, but data is exchanged over a
>>connectionless conversation.  And custom applications can be how ever you
>>want them.
>>
>>The main difference between TCP & UDP is that when you send data via TCP,
>it
>>is guaranteed to not only arrive at the destination (or cause an error)
but
>>also in the same order you send it.
>>
>>When you send with UDP, not only is the data NOT guaranteed to arrive at
>the
>>destination, but the data MIGHT be out of order.  As a result, UDP tends
to
>>be used for "trivial" things (like ping) or broadcast where each byte of
>>data is not that important (streaming sound/video).
>>
>>Bob
>>
>>-----Original Message-----
>>From: owner-midrange-l@midrange.com
>[mailto:owner-midrange-l@midrange.com]On
>>Behalf Of Jim Langston
>>Sent: Thursday, January 06, 2000 6:13 PM
>>To: MIDRANGE-L@midrange.com
>>Subject: Re: AS/400 IP COMMUNICATION WAIT TIME
>>
>>Short answer: it is not possible to disconnect without the clients
>>"knowing".
>>
>>Long answer:
>>TCP is a connection scheme.  When using TCP/IP the connection
>>remains open.  Once the communication between the server and
>>the client is closed, the TCP/IP connection is closed.  UDP, on
>>the other hand, is a broadcast scheme.  There is no permanent
>>connection.
>>
>>Since the majority of IP communication is TCP based (including
>>client access and the like) if you disconnect the cable from either
>>the server or the client the channel is closed, and the program
>>errors out, either graceful with a window saying the session has
>>been terminated, or ungraceful for programs not looking for this.
>>
>>Once you disconnected and reconnected, the connections would
>>have to be re-established.
>>
>>Regards,
>>
>>Jim Langston
>>
>>oludare wrote:
>>
>>> Hi Guys, I need to know.  Is it possible to disconnect the RJ45 that
>>> connects all CLIENTS (PCs) to the AS/400 box, communicating over IP,
>>> and reconnect back without any CLIENT knowing that communication was
>>> interrupted.  What happen to all active interactive jobs (programs)
>>> from the PCs and Session Manager? Thanks for you help. Oludare
>>
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