Ubuntu - Install PPTP at Linux as VPN Server via Internet

This is not my, I just copy original the post in here:

VPN server is a reliable solution for us who need unlimited connections to the office where we work. VPN server which I will discuss here is a VPN connection through the Internet, through the tunnel (the tunnel) which will be made on the Ubuntu 8.04 Server machine.

Ok, here are step-by-step to install it:

• root@server:~# aptitude update && aptitude install pptpd

After doing the above command, then ubuntu will download and install it, and when you finish, then proceed to change the file /etc/pptpd.conf.

• root@server:~# vim /etc/pptpd.conf

localip 10.14.20.1
remoteip 10.14.20.200-220

• Description:
  
  • localip: ip address of the LAN gateway
  • remoteip: is the ip arrange to be provided to client
  • After doing the above command, the next is that we must create a user account for PPTP connections, the following steps

• root@server:~# vim /etc/ppp/chap-secrets

# Secrets for authentication using CHAP
# client server secret IP addresses

udiniq pptpd 123456 10.14.20.0/24
geeks pptpd 123456 10.14.20.0/24
charles pptpd 123456 10.14.20.0/24

• Description:
  
  • Client: is the name of the user account (member) that will be used for VPN connections
  • Server: is the name of the configuration server to be used in accordance with the contents of the file /etc/ppp/ pptpd-options, and by default is pptpd
  • secret: a password that will be used for a VPN connection each member
  • IP addresses: the ip address for the user

Next To create pptp client that can communicate with each other, then it must be ip_forward enabled server, the following steps:

• root@server:~# vim /etc/sysctl.conf

by pressing the letter i find writing #net.ipv4.conf.default.forwarding = 1 and remove the fence that marks the net.ipv4.conf.default.forwarding = 1


If the above steps have been done all please restart the pptpd server:

• root@server:~# /etc/init.d/pptpd restart

Source: http://www.udiniqgeek.com/vpn_server.html