Deploy pptp vpn in VPS

VPS_PPTP.sh

#!/bin/sh
#! via https://www.digitalocean.com/community/tutorials/how-to-setup-your-own-vpn-with-pptp

if [ `id -u` -ne 0 ] 
then
  echo "please run it by root"
  exit 0
fi
 
apt-get -y update
 
apt-get -y install pptpd || {
  echo "could not install pptpd" 
  exit 1
}
 
cat >/etc/ppp/options.pptpd <<END
name pptpd
refuse-pap
refuse-chap
refuse-mschap
require-mschap-v2
require-mppe-128
ms-dns 8.8.8.8
ms-dns 8.8.4.4
proxyarp
lock
nobsdcomp 
novj
novjccomp
nologfd
END
 
cat >/etc/pptpd.conf <<END
option /etc/ppp/options.pptpd
logwtmp
localip 192.168.2.1
remoteip 192.168.2.10-100
END
 
cat >> /etc/sysctl.conf <<END
net.ipv4.ip_forward=1
END
 
sysctl -p
 
iptables-save > /etc/iptables.down.rules
 
iptables -t nat -A POSTROUTING -s 192.168.2.0/24 -o eth0 -j MASQUERADE
 
iptables -I FORWARD -s 192.168.2.0/24 -p tcp --syn -i ppp+ -j TCPMSS --set-mss 1300
 
iptables-save > /etc/iptables.up.rules
 
cat >>/etc/ppp/pptpd-options<<EOF
pre-up iptables-restore < /etc/iptables.up.rules
post-down iptables-restore < /etc/iptables.down.rules
EOF
 
cat >/etc/ppp/chap-secrets <<END
username pptpd password *
802 pptpd 802 *
END
 
service pptpd restart
 
netstat -lntp
 
exit 0