pptpd no internet access

pptpd.sh

nano /etc/sysctl.conf
# Add or find and comment out the following line

net.ipv4.ip_forward=1
# Save, close the file and run the following command to make the changes take effect.

sysctl -p
# The following iptables firewall rules allow port 1723, GRE and perform NAT

iptables -I INPUT -p tcp --dport 1723 -m state --state NEW -j ACCEPT
iptables -I INPUT -p gre -j ACCEPT
iptables -t nat -I POSTROUTING -o eth0 -j MASQUERADE