IPV6 HEADER COMPOSITION
Before starting discussion on the IPv6 header, it’s important to review the IPv4 header. The standard IPv4 header, which is 20 octets long, is shown in Figure 9.1. Descriptions of some fields are shown in Table 9.2.
Figure 9.1. Structure of IPv4 IP header.
| Field | Description |
|---|---|
| Version | Shows the version of the IP protocol used in the packet. |
| IHL | Shows the length of the header in 32-bit long words. |
| TOS | The Type-of-Service field. |
| Total Length | This is the total length of the data packet. |
| FLAGS | Control fragmentation and reassembly, among other things. |
| TTL | Shows the Time-To-Live value. |
| Checksum ... |
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