Cisco DMVPN Phase 1 and OSPF routing Configuration and Verification
We will look at how to configure Cisco DMVPN phase 1. Further more we will run OSPF routing and everything will be encrypted with IPSec. What is DMVPN DMVPN is a combination of protocols (GRE, NHRP, IPSec etc.) which facilitates to create a HUB-And-Spoke overlay network with minimum configuration effort. Or we can archive a fully meshed network (phase 3) with minimum effort. For theory and get an idea of how everything works, I recommend reading In-depth look at Fortigate's ADVPN - Part I and In-depth look at Fortigate's ADVPN - Part II , where the theory behind underlay network is almost same. The difference is Fortinet uses proprietary extension of IPSec protocol and Cisco uses proprietary implementation of GRE and NHRP. One can also do a Google search to get an idea about how DMVPN works. In this blog post, we will configure DMVPN Phase 1 which means that from routing perspective, our network will work as hub-and-spoke topology. All the communication...