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DES-7200 Configuration Guide Chapter 2 IPv6 Configuration
2-9
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:
z Version:
The length is 4 bits. For IPv6, the field must be 6.
z 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.
z 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.
z Payload Length:
The length is 16 bits, including the byte length of payload and the length of various
IPv6 extension options (if any). In other words, it includes the length of an IPv6 packet
except for the IPv6 header itself.
z Next Header:
This field indicates the protocol type in the header field following the IPv6 header.
Similar to the IPv4 protocol field, the Next Header field can be used to indicate whether
the upper level is TCP or UDP. It can also be used to indicate whether an extended
IPv6 header exists.