function installVPN(){
echo "begin to install VPN services";
#check wether vps suppot ppp and tun

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

arch=`uname -m`

wget http://www.hi-vps.com/downloads/dkms-
wget http://wty.name/linux/sources/kernel_ppp_mppe-1.0.2-3dkms.noarch.rpm
wget http://www.hi-vps.com/downloads/kernel_ppp_mppe-1.0.2-3dkms.noarch.rpm
wget http://www.hi-vps.com/downloads/pptpd-1.3.4-2.el6.$arch.rpm
wget http://www.hi-vps.com/downloads/ppp-2.4.5-17.0.rhel6.$arch.rpm

yum -y install make libpcap iptables gcc-c++ logrotate tar cpio perl pam tcp_wrappers
rpm -ivh dkms-
rpm -ivh kernel_ppp_mppe-1.0.2-3dkms.noarch.rpm
rpm -qa kernel_ppp_mppe
rpm -Uvh ppp-2.4.5-17.0.rhel6.$arch.rpm
rpm -ivh pptpd-1.3.4-2.el6.$arch.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" >> /etc/pptpd.conf
echo "remoteip" >> /etc/pptpd.conf
echo "ms-dns" >> /etc/ppp/options.pptpd
echo "ms-dns" >> /etc/ppp/options.pptpd

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

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

iptables -t nat -A POSTROUTING -s -j SNAT --to-source `ifconfig | grep 'inet addr:'| grep -v '' | cut -d: -f2 | awk 'NR==1 { print $1}'`
iptables -A FORWARD -p tcp --syn -s -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}"


function repaireVPN(){
echo "begin to repaire VPN";
mknod /dev/ppp c 108 0
service iptables restart
service pptpd start

function addVPNuser(){
echo "input user name:"
read username
echo "input password:"
read userpassword
echo "${username} pptpd ${userpassword} *" >> /etc/ppp/chap-secrets
service iptables restart
service pptpd start

function viewVPNuser(){
cat /etc/ppp/chap-secrets

function restartVPN(){
service iptables restart
service pptpd start

echo "which do you want to?input the number."
echo "1. install VPN service"
echo "2. repaire VPN service"
echo "3. add VPN user"
echo "4. view VPN user"
echo "5. restart VPN service"
read num

case "$num" in
[1] ) (installVPN);;
[2] ) (repaireVPN);;
[3] ) (addVPNuser);;
[4] ) (viewVPNuser);;
[5] ) (restartVPN);;
*) echo "nothing,exit";;

在文件最后添加 mtu 1436 即可


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