We set "HostnameLookups Off", yet we see many hostnames in both 
/var/log/apache2/access.log and /var/log/apache2/rewrite log.

This is causing huge problems because some of our clients have IP addresses 
with no DNS entries, and the delay caused by the lookup is enough to trigger a 
missed TCP/IP ACK packet on the client, resulting in a five-second delay for 
every single GET request.

What, besides "HostnameLookups", can cause Apache to do a DNS lookup?

(And yes, I checked HostnameLookups VERY carefully.  It is Off in apache2.conf, 
and doesn't occur anywhere else in the entire disk drive.)

Thanks,
Craig

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