setup vpn server on Amazon EC2

My environment: Amazon free EC2, Ubuntu 10.04 64bit

You should modify some hard code.

server side

• $ cat setup-pptpd.sh

  #!/bin/bash
  
  # install pptpd
  apt-get install -y pptpd
  
  # config pptpd
  echo "localip 192.168.2.1" >> /etc/pptpd.conf
  echo "remoteip 192.168.2.2-10" >> /etc/pptpd.conf
  echo "ms-dns 172.16.0.23" >> /etc/ppp/options.pptpd
  echo "ms-dns 8.8.8.8" >> /etc/ppp/options.pptpd
  
  # generate user's password
  passwd=`openssl rand 10 -base64`
  if [ "$1" != "" ]
  then passwd=$1
  fi
  
  # setup authenticated user
  echo "user pptpd $passwd *" >> /etc/ppp/chap-secrets
  
  # for ipv4 forwarding
  sed -i 's/^#net.ipv4.ip_forward = 1/net.ipv4.ip_forward = 1/' \
   /etc/sysctl.conf
  sysctl -p
  
  # use iptabes to get the net forward
  iptables -t nat -A POSTROUTING -s 192.168.2.0/24 -j SNAT \
   --to-source $(ifconfig  | grep 'inet addr:'| \
   grep -v '127.0.0.1' | cut -d: -f2 \
   | awk 'NR==1 { print $1}')
  iptables -A FORWARD -p tcp --syn -s 192.168.2.0/24 \
   -j TCPMSS --set-mss 1356
  service iptables save
  
  # make the iptables and pptpd auto start
  chkconfig iptables on
  chkconfig pptpd on
  
  service iptables start
  service pptpd start
  
  echo "VPN service is installed"
  echo "VPN username is user,VPN password is $passwd"

client side

$ cat setup-pptp-client.sh

#!/bin/bash

apt-get install -y pptp-linux

# modify those variable for your environment
vpn_server="1.2.3.4"
user="user"
passwd="secret"

echo "pty \"pptp $vpn_server --nolaunchpppd\"
name $user
remotename pptpd 
require-mppe-128
file /etc/ppp/options.pptp
ipparam pptpd" > /etc/ppp/peers/pptpd

echo "$user pptpd $passwd *" >> /etc/ppp/chap-secrets

echo "setup vpn client done."
echo -e "now, you shoule run:"
echo -e "\t$ pon pptpd # start pptpd"

echo -e "\t$ pon pptpd debug dump logfd 2 nodetach # debugging"
echo -e "\t$ poff pptpd # stop pptpd"
echo -e "\t$ ifconfig # check network config"