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I don't see the point in connecting to the ext net with a router if you are not going to use FIP's. As stated by the previous answer you can connect directly to the provider network if the tenant who created the ext network is the one who want's to connect an instance to it. Or you can share the network to all tenants to use it. Or create RBAC policies to control who has access to the provider network. There is no harm in doing so. And you can create FLAT,Vlan,Local provider network and connect instances to it directly.

As i know you cannot have public access to an instance without using FIP's when using a router. You can however attach two ports to an instance, one connected directly to the provider network and one on a private network connected to a router