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What exactly is a physnet ? Why is it used to specify a provider network ? Why cant we use the ethernet interfaces like eth0,eth1 directly to identify the physical network ? And where is the mapping of physnet implemented in openstack ?

What exactly is a physnet ? I am confused as of now about it. Why is it used to specify a provider network ? Why cant we use the ethernet interfaces like eth0,eth1 directly to identify the physical network ? And where is the mapping of physnet implemented in openstack ?