1. Download and install the following files. You can download from here or you can find the files at Sourceforge
    ppp-mppe-2.4.1-.i386.rpm
    pptpd-1.1.4-b4.i386.rpm
    ppp-2.4.2-b3.i386.rpm

   To install do the following
   [root]# rpm -Uvh ppp*.rpm

2. Download the kernel patch and patch your kernel for the MPPE encryption. You can download from here or you can find the files at Sourceforge
    kernelmod-0.7.1.tar.gz

   Execute the following commands to patch your kernel module
   [root]# tar -zxvf kernelmod-0.7.1.tar.gz
   [root]# cd kernelmod
   [root]# ./kernelmod.sh -a i686 [-k if not default]

   when this is completed, display your module list and you should see the following modules loaded
   [root]# lsmod
   ppp_mppe 13976 0 (unused)
   ppp_generic 24572 0 [ppp_mppe]
   slhc 6596 0 [ppp_generic]

3.Edit the configuration files
   - My local network in this example is 172.16.0.0/16. You will need to change the IP Address to meet your needs

/etc/pptpd.conf
-------------------------------------------------
debug
option /etc/ppp/options.pptpd
localip 172.16.0.3
remoteip 172.16.0.100-235

/etc/ppp/options.pptpd
-------------------------------------------------
lock
debug
name pptpd
bsdcomp 0
proxyarp
refuse-pap
refuse-chap
refuse-mschap
require-mschap-v2
require-mppe
ms-wins 172.16.0.3
ms-dns 172.16.0.3

/etc/ppp/chap-secrets
-------------------------------------------------
# client server secret IP addresses
user1 pptpd password *
user2 pptpd password *

4. Ensure IP Forwarding is enabled
   [root]# cat /proc/sys/net/ipv4/ip_forward
   1

   If the value is not 1 you can enable ip forwarding by
   [root]# echo 1> /proc/sys/net/ipv4/ip_forward

   You can have it always default to 1 by editing
   /etc/sysconfig/nework
 

5. Start pptpd
   [root]# /etc/init.d/pptpd start

Verify that it start successfully
[root]# netstat -a -n
tcp 0 0 0.0.0.0:1723 0.0.0.0:* LISTEN

PPTP uses tcp port 1723 and protocol 47 (GRE)
If you have a firewall in front of the VPN server make sure
you open the appropriate ports

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