Configuration Guide IPv6 Configuration
IPv6 Packet Header Structure
The format of the IPv6 packet header is shown as the figure below:
The IPv4 packet header takes 4 bytes as the unit; the IPv6 packet header takes 8
bytes as the unit and the total length of the packet header is 40 bytes. In the IPv6
packet header, the following fields are defined:
Version:
The length is 4 bits. For IPv6, the field must be 6.
Traffic Class:
The length is 8 bits. It indicates a type of service provided to the packey and is equal to
the “TOS” in the IPv4.
Flow Label:
The length is 20 bits used to identify the packets of the same service flow. One node
can be taken as the sending source of several service flows. Flow label and source
node IP address identify a service flow uniquely.
Payload Length:
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