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#1
In this diagram. The public network is 10.33.2.0/24. Does that mean that this is the interface that map em1 on the Neutron and this is the port that provide external connectivity such as Internet access, other enterprise server resources that are not reside on this Openstack cluster?

And does that also mean that the default gateway for this interface would be the interface IP configure on the external router?

When the compute nodes need to access the Internet, does not also mean that all traffics will be routed to the Neutron node? So what is the default gateway for the virtual server? and the br-int is in the same subnet as em1?