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After working through the networking portion of the install guide, the concepts are clearer to me now. Here's are some points for those who were a little confused as well:

  • It's useful to differentiate between user interaction with the host systems (e.g. dashboard) vs the instances.
  • User interaction with, for example dashboard, is via the management interface.
  • The external interface on the network node is the connecting point between external networks and all the virtual networks that the instances are connected to. For example, after setting up the 'demo-router' between the tenant network and the external network, I was able to ping the external facing interface on this router from the external network. The tenant facing interface on this router is the default gateway for the instances.
    • All traffic between the instances and external networks passes through this interface.