Dec
23
In this post we are going to speak mainly of NHRP. The other important part of DMVPN - IPsec - is relatively the same, and did not change with introduction of NHRP Phase 3. To begin with, let's quickly recall the core features of NHRP Phase 1 & 2. For detailed overview, you may refer to DMVPN Explained NHRP Phase 1: No spoke-to-spoke tunnels but spokes dynamically register their NBMA addresses with the hub. Spokes use p2p tunnels and route all traffic across the hub. It is OK to summarize... Read More
Aug
02
DMVPN stands for Dynamic Multipoint VPN and it is an effective solution for dynamic secure overlay networks. In short, DMVPN is combination of the following technologies: 1) Multipoint GRE (mGRE) 2) Next-Hop Resolution Protocol (NHRP) 4) Dynamic Routing Protocol (EIGRP, RIP, OSPF, BGP) 3) Dynamic IPsec encryption 5) Cisco Express Forwarding (CEF) Assuming that reader has a general understanding of what DMVPN is and a solid understanding of IPsec/CEF, we are going to describe the role and... Read More

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