Which VPN server and on which OS to raise (easier to install / eats few resources)?

Question

linux

1) to make it easy / quick to install
2) to be able to run several vpn on additional ip.
3) Free and good quality.

Answer 1

OpenVPN, let your system administrator choose the distribution on which to deploy.

Answer 2

The simplest of the existing ones is vtun, it is configured elementarily, quickly and free of charge

Answer 3

SoftetherVPN

Answer 4

tinc
key differences from OpenVPN: can p2p exchange between all network members, continuity due to support for multiple servers.
ADD:
about performance habrahabr.ru/post/185624

Answer 5

Here is a very cool setup, easy to install and work without problems. I use it myself - it suits everyone.
Includes immediately:

• L2TP/IPsec
  
• OpenSSH
  
• openvpn
  
• shadowsocks
  
• sslh
  
• Stunnel
  
• Tor
  

Answer 6

The easiest is openvpn. IMHO on centos, but by and large it doesn't matter.
Correct L2TP ipsec. Because the standard.