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Mainframe TCPIP

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New User

Joined: 11 Mar 2009
Posts: 28
Location: India

PostPosted: Wed May 06, 2009 4:09 pm    Post subject: Mainframe TCPIP
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Can any one tell me how TCP/IP work in mainframe?

As per my finding and knowledge, following should be a flow of connection.

(Other system) <---> { Mainframe (TCPIP job) <---> (Other system of mainframe) }

Where other system of mainframe - DB2, MQ, or CICS etc.

And Can I say TCPIP job in mainframe as a server for mainframe as per TCPIP Client/server concept. where Client could be other system.

Please correct me on it.
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Robert Sample

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Joined: 06 Jun 2008
Posts: 8054
Location: East Dubuque, Illinois, USA

PostPosted: Wed May 06, 2009 4:26 pm    Post subject:
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Go to IBM's web site. Find the Communications Server bookshelf on that web site. Read in the bookshelf until you've found out what you want to know about TCP/IP on the mainframe.

In general, connections between subsystems on a single machine are not done via TCP/IP but rather cross-memory services in one fashion or another. Connections from your PC's terminal emulator to the mainframe are accomplished via the mainframe's TCP/IP stack. So it's not just things like DB2, MQ, or CICS that use TCP/IP.

And the mainframe can, and does, act as client in some cases, server in other cases -- often at the same time for different processes. For example, if you use your desktop machine to FTP to the mainframe, the mainframe is acting as the server to your client. At the very same time, your coworker could be using FTP on the mainframe to send a file to a Unix machine -- in which case the mainframe is the client and the Unix machine the server.
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