IPv6 Header Format
The IPv6 datagram header has changed slightly from the IPv4 datagram header. The number of header fields has been reduced, making it simpler to process and also keeps the bandwidth use to a minimum. The most important change is the introduction of extension headers, which allow a variable number of additional options to be added, without any impact on the performance of the routing of IPv6 packets. Figure 7.1 shows the IPv6 datagram format.
Figure 7.1. IPv6 datagram header format.
The header fields shown in the figure are as follows:
Version— A 4-bit field identifying the IP version number. For IPv6, the value is 6; for IPv4, ...
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