Intro to Apache - ApacheCon
Performance - DNS
  • HostNameLookups off

    By default, Apache logs the IP address of the client in the access log. Turning HostNameLookups On tells Apache to log the hostname. Don't do that.

  • Deny From hostname

    When using the hostname in a Allow or Deny, Apache has to do a double-reverse lookup to prevent spoofing. Don't do that. Use the IP address if possible.
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ApacheCon : Intro to Apache - Slide #103 of 139