Appliedz/OS32 min
z/OS networking: TCP/IP and SNA
How z/OS talks to the world: Communications Server, the TCP/IP stack and OSA adapters, VIPA and Sysplex Distributor, the TN3270 server behind every green screen, SNA and VTAM basics, and a layered way to troubleshoot connections.
What you will be able to do
- Describe Communications Server, the TCP/IP stack, its profile and OSA adapters
- Use NETSTAT, PING, TRACERTE and D TCPIP displays to check addresses, routes and listeners
- Explain VIPA, dynamic VIPA, Sysplex Distributor and the TN3270 server at concept level
- Explain SNA and VTAM basics and troubleshoot connectivity layer by layer
Lessons
- Communications Server and the TCP/IP stackz/OS Communications Server provides both TCP/IP and SNA networking. The TCP/IP stack runs as a started task, is configured by a profile dataset, and reaches the network through…
- VIPA, Sysplex Distributor and the TN3270 serverA virtual IP address (VIPA) is not tied to one adapter, so an application stays reachable if a card fails. Dynamic VIPA and Sysplex Distributor extend that across a sysplex. The…
- SNA and VTAM basics, and troubleshooting connectivitySNA is IBM's original networking architecture and VTAM is its z/OS implementation. It still carries 3270 sessions and some application traffic, often over IP today. When…
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