Communications Server for z OS V1R9 TCP IP Implementation by IBM Redbooks

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Extra resources for Communications Server for z OS V1R9 TCP IP Implementation Volume 1: Base Functions, Connectivity, and Routing

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4, “Problem determination” on page 39 Problem determination techniques © Copyright IBM Corp. 2008. All rights reserved. 1 Basic concepts of the Resolver A Resolver is a set of routines that acts as a client on behalf of an application. It reads a local host file or accesses one or more Domain Name System (DNS) for name-to-IP address or IP address-to-name resolution. In most systems, in order for an application to reach a remote partner, it uses two commands to ask the Resolver what the IP address is for a host name, or vice versa.

Applications using UNIX System Server callable APIs or LE C/C++ sockets APIs can be implemented using a generic bind to open the same port in all TCP/IP stacks. By doing so, the application will accept incoming connections or UDP datagrams over any interface of all connected stacks, as shown in Figure 2-8 on page 29. 28 CS for z/OS V1R9 TCP/IP Implementation Volume 1: Base Functions, Connectivity, and Routing socket( ) bind(8001, 0) listen( ) Inbound Outbound BPX Callable Sockets Pre-routing Table C-INET TCPA TCPC TCPB X Y Z V Figure 2-8 USS callable APIs or LE C/C++ sockets APIs using generic bind in a multi-stack environment Outbound connections or UDP datagrams are processed by the C-INET pre-router, and the stack with the best route to the destination is chosen.

220 router2 1 2 1::2 TESTIPV6ADDRESS1 1:2:3:4:5:6:7:8 TESTIPV6ADDRESS2 2 1 The mapping of a name and a IPv4 address is listed. 2 The mapping of a name and a IPv6 address is listed. DATA file for the TCPIPA stack with file name DATAA30. TCPPARMS(DATAA30) ; ***************************************** TCPIPJOBNAME TCPIPA 1 HOSTNAME WTSC30A 2 36 CS for z/OS V1R9 TCP/IP Implementation Volume 1: Base Functions, Connectivity, and Routing DATASETPREFIX TCPIPA MESSAGECASE MIXED 1 Specifies the procedure name of TCPIPA stack.

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