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Introduction

In basic zone CloudStack provides Static NAT (1:1 NAT) from public IP to VM's private IP in basic zone. Below are the semantics of EIP as implemented in CloudStack. 

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In this semantics, a public IP is allocated for each VM created in basic zone. For deployments where public IP is scarce resource, allocating public IP for each VM will be expensive. Currently there is no provision in the CloudStack modify this behaviour.  This proposal provides flexibility to the cloud admin, where they can choose not to allocate public IP to the VM by default.

Design

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