Furukawa Network Solution NTT KDDI Softbank Telecom This document describes the over-lay network solution by utilizing dynamically established IPsec multi-point Security Association (SA) without individual connection. Multi-point SA technology provides the simplified mechanism of the Auto Discovery and Configuration function. This is applicable for any IPsec tunnels such as IPv4 over IPv4, IPv4 over IPv6, IPv6 over IPv4 and IPv6 over IPv6.