IPv6 is needed to sustain the growth of the Internet. In theory, we could continue to use IPv4 and work around the address space and security limitations of that protocol, but eventually, the cost of staying with IPv4 will outweigh the benefits. IPv6 eliminates concerns about address exhaustion while improving security. The transition to IPv6 will require planning and likely some degree of support for both protocols during the transition period. As noted by those responsible for managing Internet addresses, it is only a matter of time before IPv4 is no longer viable. Early planning will help ensure the transition is no more difficult than it need be.
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