the new protocol to consider all of the limitations of IPv4 at the same time.
Some of these constraints were:
9 Provide an unreliable datagram service (as IPv4)
9 Support unicast and multicast
9 Ensure that addressing is adequate beyond the foreseeable future
9 Be backwards compatible with IPv4 so that existing networks do not need to
be renumbered or reinstalled, yet provide a simple migration path from IPv4
to IPv6
9 Provide support for authentication and encryption
9 Architectural simplicity should smooth out some of the "bolt-on" features of
IPv4 that
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