VPN on Ubuntu

I need to make a VPN connection between two servers
so I prefered openvpn

sudo apt-get install openvpn

these are samples from man openvpn

make nodes

sudo mknod /dev/net/tun c 10 200
sudo modprobe tun

then you can set connection like here

without security
sudo openvpn --remote june.kg --dev tun1 --ifconfig 10.4.0.1 10.4.0.2 --verb 9
sudo openvpn --remote may.kg --dev tun1 --ifconfig 10.4.0.2 10.4.0.1 --verb 9

with static-key security
sudo openvpn --genkey --secret key
sudo openvpn --remote june.kg --dev tun1 --ifconfig 10.4.0.1 10.4.0.2 --verb 5 --secret key
sudo openvpn --remote may.kg --dev tun1 --ifconfig 10.4.0.2 10.4.0.1 --verb 5 --secret key

I prefered second one
you can test with
ping 10.4.0.1
ping 10.4.0.2