It is not a matter of if, but when, IPv4 address space
will run out. Address re-use is a short-term solution that restricts
facilities. Scarcity of IP addresses will lead to rationing, either
by arbitrary control, or by price. With IP Version 6 (IPv6) [also
sometimes referred to as Ipng] there will be no scarcity of
addresses.
Address re-use mechanisms work for people who just use
e-mail and the Web, but it is not viable for servers, which need
dedicated IP addresses.
Today, customers of ISPs cannot change service providers
without changing IP addresses. The ISP can't change its backbone
connections without changing the customers' addresses. Avoiding
address-change disruption causes "lock-in" for customer and
provider alike.
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