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CISCO : Dynamic Multipoint Virtual Private Network (DMVPN) | ITNETWORKS

1- Definition


 DMVPN is a technology that's used in secure networks exchanging data between them without needing to redirect traffic through a headquarter server or router.

Dynamic Multipoint VPN (DMVPN) is a Cisco IOS Software solution for building reliable IPsec Virtual Private Networks (VPN).


DMVPN basically is a centralized architecture that provides easier management and implementation for deployments that need very specific access controls, authorizations and restrictions for diverse branches, users, applications and partners.
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DMVPN + IPSEC

2- Benefits


DMVPN provides the ability to create dynamic VPNs without configuring static tunnels between remote peers, including Internet Protocol (IP), IPSEC and Key Management Protocol (ISAKMP peers).

 DMVPN is designed to make HUB-AND-SPOKE topology by statically configuring the hub IP address on the spokes, no other changes are needed in the configurationns of the hub to accept new spokes. 

Through this topology (hub & spoke), the tunnels generated dynamically between spokes will be automagically generated on demand (this is what we call DYNAMIC MESH) without further configuration on hubs or spokes.

This way there will be no need to configure the hub to route traffic between the spokes.


3- Technologies




Four important technologies are used to form a DMVPN Tunnel: 







  • NHRP (next-hop resolution protocol).


  • IPsec (Internet Protocol Security) using an IPsec configuration related to a virtual tunnel interface in IOS software. All traffic sent via the tunnel will be encrypted according to the policy that is pre-configured.








To see the full configuration visit this website:


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