Regardless of which protocol is used, the communication between IPv4 and IPv6 domains must be transparent to end users. The major differences to consider between IPv4 and IPv6 include the following:
■ IPv4 addresses are 32 bits long, whereas IPv6 addresses are 128 bits long.
■ An IPv6 packet header is different from an IPv4 packet header. The IPv6 header is longer and simpler (new fields were added to the IPv6 header, and some old fields were removed).
■ IPv6 has no concept of broadcast addresses; instead, it uses multicast addresses.
■ Routing protocols must be changed to support native IPv6 routing.
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