Managing the resolver address space

The resolver start procedure name is used with the following MVS™ system commands to manage the resolver address space:

• Start (S)
• Stop (P)

  You should stop and restart the resolver only when a new level of the resolver code has been installed.

• Force
• Modify (F)

  Use the MODIFY command to dynamically change resolver setup statements, to update the use of TCPIP.DATA statements, or to update the use of local host and services tables. Dynamic changes are not supported by the resolver that is provided by the SMTP server and the z/OS® UNIX commands dig, nslookup, and nsupdate.

  You can also use the MODIFY command to delete the information that the resolver has acquired about name server capabilities, and to restart the monitoring of unresponsive DNS name servers function after the resolver has stopped monitoring because of a system error.

  You can use the MODIFY FLUSH command to delete all the resolver cache data.

  Guideline: If you use the MODIFY command to dynamically change resolver setup statements and the resolver detects unrecognized setup statements or setup statements with syntax errors in the setup file specified on the MODIFY command, the resolver does not process the MODIFY command.

See z/OS Communications Server: IP System Administrator's Commands for more information about these commands.

You can use the following MVS system commands to control and display the status of the resolver CTRACE facilities:

• Trace CT
• Display Trace

See z/OS Communications Server: IP Diagnosis Guide for information about using CTRACE.