I am working in a Cisco ecosystem and need to be able to test a 9 tunnel IPSec network over the internet using 10 x Cisco 1941 routers. This is a "hub and spoke" type configuration; where all 9 remote sites (spoke) will connect to the main office site (hub). Simple Logical Diagram looks a little like this:
I have a subnet plan in the Class A network range (10.0.0.0), and no networks overlap. I have checked both manually and with online subnet calculators.
Example video from a Packet Tracer environment (For EXAMPLE only) tutorial, which are confirmed working by myself, but only show connecting 2 sites together. The first 2 sites connect just fine and both LANs are accessible bidirectionally.
Problem: However, when I try to setup the other 8 sites using the same exact method shown in the video linked above (except changing unique connection details such as a different access list, peer, key and map ID), they never connect.
Question: Is there ANY way with Cisco equipment (simple/complex, IPsec tunnel/other) to connect all 9 sites in this scenario to the main network?
If you need any additional information such as configurations, let me know. Thank you for your time.