A detailed instruction is presented by Digital Ocean: https://www.digitalocean.com/community/questions/how-to-install-pptp-vpn-on-centos-7
To make it working with
firewalld, we've made a few updates, and the script is pasted here: gist#!/bin/sh
# Install pptpd
rpm -Uvh http://download.fedoraproject.org/pub/epel/beta/7/x86_64/epel-release-7-1.noarch.rpm
yum -y install ppp pptpd
# pptpd settings
echo 'localip 10.10.0.1' >> /etc/pptpd.conf
echo 'remoteip 10.10.0.100-199' >> /etc/pptpd.conf
echo 'ms-dns 8.8.8.8' >> /etc/ppp/options.pptpd
echo 'ms-dns 8.8.4.4' >> /etc/ppp/options.pptpd
echo 'USERNAME pptpd PASSWORD *' >> /etc/ppp/chap-secrets
# system ipv4 forward
sysctl_file=/etc/sysctl.conf
if grep -xq 'net.ipv4.ip_forward' $sysctl_file; then
sed -i.bak -r -e "s/^.*net.ipv4.ip_forward.*/net.ipv4.ip_forward = 1/" $sysctl_file
else
echo 'net.ipv4.ip_forward = 1' >> $sysctl_file
fi
sysctl -p
# firewalld
zone=public
firewall-cmd --permanent --new-service=pptp
cat >/etc/firewalld/services/pptp.xml<
EOF
firewall-cmd --permanent --zone=$zone --add-service=pptp
firewall-cmd --permanent --zone=$zone --add-masquerade
firewall-cmd --reload
# start pptpd
systemctl start pptpd
systemctl enable pptpd.service