DMVPN

DMVPN failures cluster hard. After the underlay itself, almost every broken cloud comes down to a spoke that cannot register,

Everything DMVPN sends is cleartext. GRE is an envelope with the contents printed on the outside, and a DMVPN cloud

NHRP builds the tunnels; the routing protocol decides what flows through them, and DMVPN is unusually opinionated about how you

This is the complete, working DMVPN Phase 3 build: one hub, two spokes, a router simulating the internet underlay, EIGRP

Ask what separates DMVPN Phase 1 from Phase 2 from Phase 3 and you will usually get a memorized answer:

Every interesting thing DMVPN does, it does with NHRP. Spokes appearing on the hub without configuration? NHRP registration. Spoke-to-