i have Apache/2.2.10 (Linux/SUSE) PHP/5.2.6 with Suhosin-Patch configured

Linux #1 SMP 2009-02-25 15:40:44 +0100 x86_64 x86_64 x86_64 GNU/Linux

in default-server.conf, with "allow from" you can allow certain networks/computer to access your web site.

i have seen that if you use dns names instead of ip-address sometimes the "allow from"
doesn't work

i mean if the dns name of the computer you want to grant access to, doesn't have a reverse lookup in the DNS:

(you got this reply from the dns)
server can't find X.X.X.X.in-addr.arpa.: NXDOMAIN

apache doesn't allow the computer to connect to the web site (to itself)
so i must replace the dns name with the ip address

allow from number.number.number.number

my HostnameLookups is set to Off

Unfortunately i can't ask to fix the dns.

do you have any clue/suggestion ?
bye and thanks