OpenVpn

Configurazione per linux
aptitute install openvpn

cd /etc/openvpn
openvpn -genkey -secret key.txt

edit openvpn.conf

dev tap
secret /etc/openvpn/key.txt
verb 1
log-append /var/log/openvpn.log
ifconfig 192.168.5.1 255.255.255.0
comp-lzo
keepalive 10 60

/etc/init.d/openvpn start

Configurazione per Windows
http://openvpn.se/files/install_packages/openvpn-2.0.9-gui-1.0.3-install.exe (al 19 luglio 2011)

in C:\Programmi\OpenVPN\config
edit client.ovpn
remote #ip della macchina server
dev tap
ifconfig 192.168.5.100 255.255.255.0
secret key.txt
comp-lzo
keepalive 10 60

Lanciare la connessione.