Apache httpd won't stop doing reverse DNS requests for clients' IPs
It seems the standard Ubuntu 8.04 Apache httpd install comes with a
LogFormat that starts with
%h and that does a client IP's RDNS lookup. Why oh why?? Replacing it with
%a (remote IP address, see custom log formats) reduces this problem by ca. 90%. Some remain...
Have you verified
HostnameLookups is not set in any other directive?
Have you activated the module mod_authz_host?