DMVPN – Dynamic Multipoint Virtual Private Network 🔐🌐
DMVPN is a Cisco VPN technology designed to connect multiple branch sites securely using dynamic tunnels — without configuring point-to-point VPNs for every location.
Instead of managing hundreds of static tunnels, DMVPN builds them on demand.
How DMVPN actually works (no theory):
mGRE → Single tunnel interface, multiple dynamic peers
NHRP → Resolves private tunnel IPs to public WAN IPs
IPsec → Encrypts all traffic end-to-end
DMVPN Phases (know this for interviews):
Phase 1: Hub-and-Spoke (all traffic via hub)
Phase 2: Dynamic Spoke-to-Spoke tunnels
Phase 3: Optimized routing with NHRP redirect
Why enterprises use DMVPN:
✔ Scales easily as branches grow
✔ Reduces latency with direct spoke communication
✔ Strong security using IPsec
✔ Less configuration, less operational pain
DMVPN isn’t “old tech” — it’s still running real enterprise WANs today.
If you’re serious about CCNA / CCNP Enterprise, DMVPN is not optional knowledge.
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