Install mod rpaf on Centos
Download
cd /usr/local/src wget http://mirror.trouble-free.net/sources/mod_rpaf-0.6.tar.gz tar xzvf mod_rpaf-0.6.tar.gz cd mod_rpaf-0.6
install
yum localinstall http://y-ken.github.com/package/centos/6/x86_64/mod_rpaf-fork-0.6-5.el6.x86_64.rpm yum install httpd-devel apxs -i -c -n mod_rpaf-2.0.so mod_rpaf-2.0.c
Check config file. For example /etc/httpd/conf.d/rpaf.conf
LoadModule rpaf_module modules/mod_rpaf-2.0.so RPAFenable On RPAFsethostname On RPAFproxy_ips 217.23.9.246 RPAFheader X-Real-IP