DMVPN

Transport technologies fail in layers, and the art of troubleshooting them is knowing which layer to suspect. An MPLS L3VPN

Almost every mid-to-large enterprise WAN ends up running both MPLS and DMVPN. Not because someone planned it that

Every DMVPN carries IPsec, and every IPsec deployment sits on one of two key-exchange protocols: IKEv1, the original from

Everyone builds a second DMVPN hub for redundancy. Far fewer people test that the failover actually works - and the ones

EIGRP over DMVPN works beautifully, right up until the moment you realise none of your spokes can reach any of

A branch office with two WAN routers is a good design. Two routers, two circuits, no single point of failure.