DNS - Cache Failed Lookups
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Value (STRING): DNSCacheFailedLookups
Min value: 0
Max value: 1
Default value: 1
Type: 1=Cache Failed DNS lookups, 0=Do not Cache Failed DNS lookups
Improves DNS name resolution performance by caching failed lookups. In the event that a DNS server responds with a valid response, but where the response does not include a resolved name, Kiwi Syslog Server will cache that response to avoid repeated queries to the DNS server. This situation can occur when querying a DNS server for the name of and IP address that the DNS server itself does not know. Instead of timing out, the DNS server sends a valid response of "NAME NOT FOUND". This is the sort of response that is cached, which avoids repeated queries to the DNS server for a name that will not be found. Failed lookups will be flushed from the cache at the frequency defined in "Flush entries after X minutes".