I'm assuming you've installed RH7.1 and apache is installed and running.
edit /etc/httpd/conf/httpd.conf
modify
Order Deny,Allow
Allow from all
to
Order Deny,Allow
Deny from All
allow from 192.168.0
allow from 202.101.003.089
allow from sombody.com
to allow any local lan users,
whomever owns 202.101.003.089
anyone from somebody.com
check this link:
http://httpd.apache.org/docs/howto/auth.html#allowdeny