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Install and deploy a PPTP VPN on CentOS 5 x86 (32-bit)

2 min read June 28, 2013 at 8:05pm on Tutorials

If you are having issues manually installing and configuring a PPTP VPN from scratch, you can take advantage of this script that will handle the installation for you. This has been tested to work on CentOS 5.X x86 (32-bit).


Copy and past the following code into a new file and save it as vpn.sh:

yum remove -y pptpd ppp
iptables --flush POSTROUTING --table nat
iptables --flush FORWARD
rm -rf /etc/pptpd.conf
rm -rf /etc/ppp

wget http://www.diahosting.com/dload/dkms-2.0.17.5-1.noarch.rpm
wget http://www.diahosting.com/dload/kernel_ppp_mppe-1.0.2-3dkms.noarch.rpm
wget http://www.diahosting.com/dload/pptpd-1.3.4-1.rhel5.1.i386.rpm
wget http://www.diahosting.com/dload/ppp-2.4.4-9.0.rhel5.i386.rpm

yum -y install make libpcap iptables gcc-c++ logrotate tar cpio perl pam tcp_wrappers
rpm -ivh dkms-2.0.17.5-1.noarch.rpm
rpm -ivh kernel_ppp_mppe-1.0.2-3dkms.noarch.rpm
rpm -qa kernel_ppp_mppe
rpm -Uvh ppp-2.4.4-9.0.rhel5.i386.rpm
rpm -ivh pptpd-1.3.4-1.rhel5.1.i386.rpm

mknod /dev/ppp c 108 0
echo 1 > /proc/sys/net/ipv4/ip_forward
echo "mknod /dev/ppp c 108 0" >> /etc/rc.local
echo "echo 1 > /proc/sys/net/ipv4/ip_forward" >> /etc/rc.local
echo "localip 172.16.36.1" >> /etc/pptpd.conf
echo "remoteip 172.16.36.2-254" >> /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

pass=`openssl rand 6 -base64`
if [ "$1" != "" ]
then pass=$1
fi

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

iptables -t nat -A POSTROUTING -s 172.16.36.0/24 -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 172.16.36.0/24 -j TCPMSS --set-mss 1356
service iptables save

chkconfig iptables on
chkconfig pptpd on

service iptables start
service pptpd start

echo "VPN service is installed, your VPN username is vpn, VPN password is ${pass}"

Then change the permissions:

chmod 755 vpn.sh

Run the file as root:

sh filename.sh

After the installation is complete, the script will display a randomly generated username and password. You may change these details by editing the /etc/ppp/chap-secrets file and restarting PPTP:

/etc/init.d/pptpd restart

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