IPv4 address exhaustion

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IPv4 address exhaustion

The continual depletion of Internet addresses that conform to the original 32-bit IPv4 addressing scheme. IPv4 provides 4.3 billion unique addresses, but they are rapidly being eliminated as remaining addresses are assigned to more and more organizations and devices that go online. The IPv6 128-bit addressing scheme provides "skintillions" of addresses. See IANA, IPv6 and IP address.
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IPv6 allows network architects to revisit many important IP-related issues in addition to the IP address shortage, such as security, quality of service, mobility, multicasting, and network management.
Many large digital subscriber lines (DSL) providers recommend PPPoE because it effectively prevents IP address shortages, misdirected broadcasts and other difficulties inherent in bridged networks.