The organization that I work for is almost done with the process of switching their 2,000 endpoints from an external IP range to an internal range. For the near future, there will be a handful of endpoints that use the external range and the servers always will. The external IPs will not be leased back to the IANA. Why is this the case? If a large external IPv4 block is purchased by an enterprise, can some of the addresses be resold to the IANA, if they aren't in use anymore?
I'm a desktop technician and my supervisors aren't familiar enough with networking either, to answer this question.
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