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Network Programming for Microsoft® Windows®, Second Edition by Jim Ohlund, Anthony Jones

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IPv6

With the explosion in the number of computers on the Internet, the limitations of IPv4 are becoming apparent. First and foremost, the number of available IPv4 addresses is being exhausted. This has led to the use of network address translators (NATs), which map multiple private addresses to a single public IP addresses. NATs are useful for client-server applications but can be problematic when connecting two organizations that use the private address space. Also, NATs must sometimes be aware of the underlying protocols to perform the appropriate address translation.

Second, IPv4 addressing is not entirely hierarchical, which means that the Internet backbone routers must maintain vast routing tables to deliver IPv4 packets correctly to any ...

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