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40 CS for z/OS V1R9 TCP/IP Implementation Volume 1: Base Functions, Connectivity, and Routing Next, we illustrate using Trace Resolver in a z/OS UNIX environment, and in a TSO environment. Using Trace Resolver in z/OS UNIX environment Example 2-15 shows how to enable and disable the Trace Resolver in z/OS UNIX environment. 000 seconds. txt 1 To enable the Trace Resolver, set the RESOLVER_TRACE environment variable. txt HFS file. You can also direct the output to STDOUT by specifying RESOLVER_TRACE=STDOUT.

If one address is reachable (the stack has a route to the particular address) and the other is unreachable, then place the reachable destination address prior to the unreachable address. Rule 2 Prefer matching scope. If the scope of one address matches the scope of its source address and the other address does not meet this criteria, then the address with the matching scope is placed before the other destination address. Rule 3 Avoid deprecated addresses. If one address is deprecated and the other is non-deprecated, then the non-deprecated address is placed prior to the other address.

Chapter 2. The Resolver 27 Application-specific Configuration Data socket( ) bind(8001, Y) listen( ) Inbound Outbound BPX Callable Sockets Pre-routing Table C-INET TCPA X TCPC TCPB Y Z V Figure 2-7 USS callable APIs or LE C/C++ sockets APIs using specific bind in a multi-stack environment Generic server A generic server is a server without an affinity to a specific stack, and it provides service to any clients that are connected to any TCP/IP stacks on the system. When using the generic bind, it does not matter if the chosen Resolver configuration file has a TCPIPJobname; it is not used when the server is a pure generic server.

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