Name
hostname_lookups
Synopsis
This directive tells FreeRADIUS whether to look up the canonical names of the requesting clients or simply log their IP address and move on. Much like with Apache, DNS queries take a long time and, especially on highly loaded servers, can be a detriment to performance. Turning this option on also causes radiusd to block the request for 30 seconds while it determines the CNAME associates with that IP address. Only turn this option on if you are sure you need it.
Usage:
hostname_lookups = [yes/no]
Suggestion:
hostname_lookups = no
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