I want to disable reverse DNS in Apache 2. I have done the following steps:

In apache2/apache2.conf file ,HostnameLookups is set as OFF

Tcpdump session confirmed thatApache was doing double reverse lookups even though the HostnameLookupsdirective was clearly turned off.

No hostnames insites-available. The problem still remains.

UPD: version of apache is

dpkg -l | grep apache2

ii apache2-mpm-prefork 2.2.16-6+squeeze4 Apache HTTP Server - traditional non-threaded model

ii apache2-utils 2.2.16-6+squeeze4 utility programs for webservers

ii apache2.2-bin 2.2.16-6+squeeze4 Apache HTTP Server common binary files

ii apache2.2-common 2.2.16-6+squeeze4 Apache HTTP Server common files

apache2 -l

Compiled in modules:

core.c

mod_log_config.c

mod_logio.c

prefork.c

http_core.c

mod_so.c

I think mod_security is not present.