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Dmitry Makovey wrote:
> done. Link to image attached to gist

Thank you, this helps me better understand.

Can you share what the routes on your instances look like? You'll 
obviously need to let the instance in each network how to get to the 
other networks over the 'secondary' router (assuming your addressing 
them by their RFC5735 addresses), otherwise the packets will hit the 
default gateway (the routers connected to your ext_net) and get dropped.

Regards,

Richard