How to Restrict R12 Login Page from DMZ Zone or Internet while i-Rec Module is configured on externa

We haave configured web server on external server and configures IrcVisitor access and able to access http://external.abc.com:8000/OA_HTML/IrcVisitor.jsp. But we see Login Page is also accessible. So I have done below changes in url_fw.conf file at $ORA_CONFIG_HOME/10.1.3/Apache/Apache/conf

#RewriteRule ^/$ /OA_HTML/AppsLocalLogin.jsp [R,L]

#RewriteRule ^/$ /OA_HTML/AppsLogin.jsp [R,L]

#RewriteRule ^/$ /OA_HTML/AppsLogin [R,L]

#Re-direct to the iRecruitment home page

RewriteRule ^/$ /OA_HTML/IrcVisitor.jsp [R,L]

#===============================================================

#Include URLS for login method: LOCAL

# LOCAL Login Pages

#===============================================================

#RewriteRule ^/$ http://external.abc.com:8000/OA_HTML/AppsLogin