IPv6 Header Format Part 77
IPv6 Header Format
The IPv6 header format specifies the structure of the IPv6 packet header. Here is an overview of the IPv6 header fields:
Version (4 bits): Indicates the IP version. For IPv6, the value is set to 6.
Traffic Class (8 bits): Originally designed for Quality of Service (QoS) purposes, this field is now used for Differentiated Services Code Point (DSCP) markings.
Flow Label (20 bits): Used to identify packets belonging to the same flow, allowing for special handling or QoS treatment.
Payload Length (16 bits): Specifies the size of the payload (data) in the IPv6 packet, excluding the header.
Next Header (8 bits): Indicates the type of the next header in the packet. It specifies the type of the upper-layer protocol (e.g., TCP, UDP) that follows the IPv6 header.
Hop Limit (8 bits): Similar to the IPv4 Time-to-Live (TTL) field, this field represents the maximum number of hops (routers) the packet can traverse before being discarded.
Source Address (128 bits): Contains the IPv6 address of the packet's source.
Destination Address (128 bits): Contains the IPv6 address of the packet's intended destination.
The IPv6 header does not include a checksum field like IPv4 because checksum calculations are performed at the link layer in IPv6.
In addition to these fields, the IPv6 header may have extension headers, which provide additional functionality. Extension headers are optional and can appear in a chain before the upper-layer protocol header.
Overall, the IPv6 header format provides more efficient and streamlined header processing compared to the IPv4 header, enabling improved performance and support for advanced features.
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