Dell NetWorker 19.9 Administration Guide

Clearing the resolver cache

Each operating system uses a local resolver cache. A local resolver cache removes the reliance on checking name resolution services for each name resolution request, which increases the hostname resolution speed. The operating system checks the cache first to resolve the host, and if the host record exists, the operating system does not check other name resolution services. The operating system adds an entry to the resolver cache after the first successful hostname resolution, and the entry remains in the cache for a predetermined time.

On Windows only, to display the contents of the resolver cache, type the following command:

ipconfig /displaydns

Use the appropriate command to even the contents of the resolver cache:

• On AIX and HP-UX:
  • For bind 9, type:

    rndc flush

  • For bind 8, type:

    refresh -s named

• On Solaris and Linux, restart the nscd daemon.
• On Windows, type:

  ipconfig /flushdns