Automaticlly install pptpd on Ubuntu 12.04

install.sh

# Authors: Alvin Ye
# Run by:  curl -sL https://gist.github.com/1471830.txt | sudo bash

sudo apt-get install pptpd

sed -i 's/^logwtmp/#logwtmp/g' /etc/pptpd.conf

sed -i 's/^net.ipv4.ip_forward = 0/net.ipv4.ip_forward = 1/g' /etc/sysctl.conf
sysctl -p
echo "localip 192.168.240.1" >> /etc/pptpd.conf
echo "remoteip 192.168.240.2-100" >> /etc/pptpd.conf
echo "ms-dns 208.67.222.222" >> /etc/ppp/options
echo "ms-dns 8.8.8.8" >> /etc/ppp/options

pass=`openssl rand 8 -base64`
if [ "$1" != "" ]
then pass=$1
fi

echo "vpn pptpd ${pass} *" >> /etc/ppp/chap-secrets

iptables -t nat -A POSTROUTING -s 192.168.240.0/24 -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 192.168.240.0/24 -j TCPMSS --set-mss 1356
sudo iptables-save

sudo /etc/init.d/iptables restart
sudo /etc/init.d/pptpd restart

echo -e "VPN service is installed, your VPN username is \033[1mvpn\033[0m, VPN password is \033[1m${pass}\033[1m"