UseDNS (Internet Toolkit)
The UseDNS directive specifies whether the server tries to get the Domain Name System (DNS) format for Internet Protocol (IP) addresses when logging data. Turn this option OFF on computers that are not connected to a domain name server. You can turn this option OFF on computers that have DNS access to improve performance, but this affects the access control based on DNS names.
Syntax
UseDNS setting
setting is on or off.
You can use only one UseDNS directive in the configuration file.
Default
If you do not specify to UseDNS, the server assumes the following:
UseDNS off
Example
The following directive instructs the server to use domain names when describing connections:
UseDNS on