We will just discuss a simple how to configure and connect the VPN client to the windows 2008 VPN server.

If you searching how to configure windows 2008 vpn server please follow this URL
http://www.wowtutorial.org/windows-servers/how-install-and-configure-vpn-server-windows-2008-379.html

What is VPN ?

Virtual private network (VPN) is a computer network that uses a public telecommunication infrastructure such as the Internet to provide remote offices or individual users with secure access to their organization's network. It aims to avoid an expensive system of owned or leased lines that can be used by only one organization.

It encapsulates data transfers between two or more networked devices which are not on the same private network so as to keep the transferred data private from other devices on one or more intervening local or wide area networks. There are many different classifications, implementations, and uses for VPNs.

What is OpenVPN ?

OpenVPN is a free and open source software application that implements virtual private network (VPN) solutions for creating secure point-to-point or site-to-site connections in routed or bridged configurations and remote access facilities. It uses SSL/TLS security for encryption and is capable of traversing network address translators (NATs) and firewalls. It was written by James Yonan and is published under the GNU General Public License (GPL).

Installing OpenVPN From FreeBSD Port

Mpd4 comes with no log configured in the server so we need to configure the logrotate to support mpd4 log.

Below is the steps how to configure mpd4 log :
Login into your server with root access

Edit Syslog.conf

#pico /etc/syslog.conf

### scroll down until the end of files ###
### add few lines below into syslog.conf ###

!mpd
*.*                /var/log/mpd.log

### save this file

Create log files in /var/log

This tutorial will guide you to create a connection to the VPN server.
If you searching about install and configure VPN server please click THIS.

In your Windows XP client

Click Start >> Settings >> Control Panel

You will see a screen below :

What is MPD ?

Mpd is a netgraph(4) based implementation of the multi-link PPP protocol for FreeBSD.  It is designed to be both fast and flexible.
It handles configuration and negotiation in user land, while routing all data packets strictly in the kernel.  It supports several of
the numerous PPP sub-protocols and extensions, such as: Multi-link PPP capability, PAP, CHAP, MS-CHAP and EAP authentication ,
PPP compression and encryption, IPCP and IPV6CP parameter negotiation

Install and Configure MPD4

What is PPTP?

PPTP stands for Point to Point Tunneling Protocol. It was developed by a consortium including Microsoft and is used for establishing VPN (Virtual Private Network) tunnels across the Internet. This allows remote users to securely and inexpensively access their corporate network from anywhere on the Internet.

Here is the simple steps to Setup Vpn Client to Connect to Vpn Server 

Click "Start" >> "Control Panel" >> "Network Connections" >> "New Connection Wizard" 

You will see a New Connection Wizard page below : 

Click "Next" to Continue