Description

The DNS_CACHE_TIMEOUT option specifies the number of seconds that a DNS cached host entry remains valid.

When the host name resolver is asked to resolve a host name into an IP address, the host entry returned is saved in the DNS cache. The next call to resolve a host name will return the cached entry and not go back to the resolve. The cached entry is considered valid until the cache time-out period is reached.

The DNS cache provides a performance improvement as the resolution of a host name can take some time depending on the environment.

Usage

Method	Syntax	IBM i	UNIX	Windows	z/OS
Configuration File Keyword	dns_cache_timeout seconds

Value

seconds is the number of seconds that a DNS cached host entry remains valid.

A value of 0 disables caching of host entries.

Default is 120.

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