Summary: We are going to install pptp vpn on centos 6.5 x86_64 server and will authenticate with freeradius remote server. 1. update your server and download the rpm of pptpd. yum update yum install wget wget http://poptop.sourceforge.net/yum/stable/rhel6/x86_64/pptpd-1.4.0-1.el6.x86_64.rpm