create a pptpd vpn server

1. Install pptpd.

 sudo apt-get install pptpd

2. the contents of my pptpd.conf:

option /etc/ppp/pptpd-options
debug dump
logwtmp
localip 192.168.2.6
remoteip 192.168.2.230-239

The local IP address is the IP address of your server, the one in ifconfig. The remote IPs are a range you would like the remote user to use on your LAN.

3. My /etc/ppp/pptpd-options:

name pptpd
refuse-pap
refuse-chap
refuse-mschap
require-mschap-v2
require-mppe-128
proxyarp
nodefaultroute
lock
nobsdcomp

4. Add user names and passwords for the users you want to give access to your vpn.

 rdpm pptpd mypassword *

5. Enable ipv4 forwarding in /etc/sysctl.conf:

net.ipv4.ip_forward=1

6. enable the ipv4 forwarding setting

sysctl -p

7. restart pptpd

/etc/init.d/pptpd restart