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IPv6 Network Administration by David Malone, Niall Richard Murphy

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Packets and Structures

The IPv6 packet structure is, in most ways, very similar to the IPv4 packet structure. Some fields have been removed and some have been added, but the most obvious change is the size of the addresses. While the IPv4 source and destination addresses are 32 bits each, IPv6 addresses are 128 bits each. The reason for 128 bits is discussed in the following sidebar, Is 128 Bits Enough?

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