- network interfaces implemented in user space. No kernel patches are
- required (the kernel's built-in SLIP driver is used).
- .
- Based on this, udptunnel is a a simple but flexible VPN program which
- uses ssh for authentication and key exchange but sends the packets
- over UDP. (Other VPN-over-ssh programs typically do PPP-over-TCP,
- which yields poor perfoormance.) Note that udptunnel is not IPSEC.