nscd

 

  • NSCD Caches DNS lookups by default for 5 minutes, for positive name lookups
  • NSCD Caches DNS lookups by default for 20 seconds, for negative name lookups

 

Name Server Cache Daemon NSCD caches name service lookups and can dramatically improve DNS, UID and GID lookups.
NSCD is the default DNS Caching daemon on  RHEL3 and RHEL4 hosts
NSCD is not available for RHEL5 hosts – they use Lwresd instead
RHEL4 hosts can also have Lwresd deployed to them instead of NSCD.
NSCD is being replaced by Lwresd which is a much more flexible