"During a move to the cloud, many organizations overlook potential snags surrounding IP addresses. To start, know how cloud providers manage address assignment.
Enterprises often overlook IP address issues during workload migrations from a local data center to the public cloud.
Your cloud provider and the activity of your cloud instance typically limit IP address ranges and availability, so the address that your workload uses in the public cloud is usually different than what you use on premises -- and often dynamic..."
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