Dynamic Multipoint Virtual Private Network

Dynamic Multipoint Virtual Private Network (DMVPN) is a dynamic tunneling form of a virtual private network (VPN) supported on Cisco IOS-based routers, Huawei AR G3 routers, and Unix-like operating systems. DMVPN provides the capability for creating a dynamic-mesh VPN network without having to statically pre-configure all possible tunnel end-point peers, such as IPsec and ISAKMP peers.

Source: Wikipedia — Dynamic Multipoint Virtual Private Network (CC BY-SA 4.0)