DMVPN troubleshooting.

Andrew Kelsey

I am configuring a DMVPN using CML. I have a hub and 3 spokes. I am using a switch as a stand-in for the internet.

                    Hub     
                      |     
                 Internet     
                /    |     \     
              /      |       \     
            /        |         \     
          /          |           \     
    Spoke1    Spoke2    Spoke3

So far, I have the Hub, Spoke1, and Spoke2 configured. I have tunnels established between each spoke and the hub, but I can't seem to establish one between the spokes and I would like some help in figuring that out. From what I understand, the spoke should reach out to the hub for the location of the other spoke, then establish a tunnel directly to that spoke. I have been testing the connection by pinging the inside network interface of one spoke router from another.

Networks:

Hub
     Inside network: 192.168.5.0 /24
     Outside interface: 10.0.3.1 /29
     Tunnel Interface: 172.16.1.1 /29
Spoke1
     Inside network: 192.168.6.0 /24
     Outside interface: 10.0.3.2 /29
     Tunnel Interface: 172.16.1.2 /29
Spoke2
     Inside network: 192.168.7.0 /24
     Outside interface: 10.0.3.3 /29
     Tunnel Interface: 172.16.1.3 /29
Spoke3
     Inside network: 192.168.8.0 /24
     Outside interface: 10.0.3.4 /29
     Tunnel Interface: 172.16.1.4 /29

Anthony Sequeira 0

I created YouTube videos to walk students through this. Here they are:

DMVPN Theory - https://www.youtube.com/watch?v=qHmgwRnxuYA&t=2s

DMVPN Lab Setup - https://www.youtube.com/watch?v=ioy_81c1ax8

DMVPN Final Config - https://www.youtube.com/watch?v=nhDIqrOltXs&t=743s

Andrew Kelsey

@Anthony-Sequeira-0 Thanks Anthony! I'll check them out.