TinyTUN

Tiny tunneling daemon for Linux.
No external dependencies needed (except tun/tap driver in kernel).

Encryption

Uses xtea for encryption of data. Password is shared between all nodes.

Usage

Available options
  -k / --key KEY           Specify connection key (4..16 chars)
  -s / --server PORT       Run as server and listen on specified port
  -c / --client HOST:PORT  Run as client and connect to specified HOST:PORT
  -t / --timeout t         Set keepalive timeout (5..60 sec, client only)
  -d / --dev DEV           Use specified networking interface name
                               client's default is tap%d
                               server's default is none (just route packets without netif)

It returns network interface name to stdout (or nothing if it's just route server).

One server can handle unlimited clients. Server use MAC-tables routing (like your home router/switch does). So all you need is to assign different IP addresses to clients. MAC is set by tun/tap driver.

Server

Server can run in 2 modes:

Server without networking interface (only routes packets):

    tinytun -k mypassword -s 12345

Server with networking interface:

    VPN=`tinytun -k mypassword -s 12345 -d 'vpn%d'`
    ifconfig $VPN 10.0.0.1

Client

Client automaticly connects to server:

    VPN=`tinytun -k mypassword -c myserver:5000`
    ifconfig $VPN 10.0.0.2

Building

Just type

    make

And you'll get tinytun binary. Place it wherever you need (for example to /usr/local/bin) and use it from rc-scripts.