The introduction of IPv6 will take care of the interoperability with existing Internet devices. The extension of address bits from the existing 32 bits to 128 bits helps in adding much more nodes. The scalability of multicast routing is improved. Labeling of packets belonging to particular traffic flows for which the sender requests special handling, such as non-default quality of service or "real- time" service addresses the QoS requirements. Inclusion of the definition of extensions provides support for authentication, data integrity, and confidentiality.
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