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DES-7200 Configuration Guide Chapter 2 IPv6 Configuration
2-6
One class of the global unicast address is the IPv6 address embedded with IPv4
address, which is used to interconnect the IPv4 nodes and the IPv6 nodes and divided
into IPv4-compatible IPv6 address and the IPv4-mapped IPv6 address.
The format of IPv4-compatible IPv6 address:
The format of IPv4-mapped IPv6 address:
The IPv4-compatible IPv6 address is mainly used to the automatic tunneling, which
supports both the IPv4 and IPv6. The IPv4-compatible IPv6 address will transmit the
IPv6 packet via the IPv4 router in the tunneling way. Now the IPv4-compatible IPv6
address has been repealled. The IPv6 address of an IPv4 mapping is used to access
the nodes that only support IPv4 by IPv6 nodes. For example, when one IPv6
application of the IPv4/IPv6 host requests the resolution of a host name (the host only
supports IPv4), the name server will internally generate the IPv6 addresses of the IPv4
mapping dynamically and return them to the IPv6 application.
2.1.2.2 Multicast Addresses
The format of the IPv6 multicast address is shown as follows:
| 8 | 4 | 4 | 112 bits |
+----------+----+----+-----------------------------------------------------------------+
|11111111|flgs|scop| group ID |
+----------+----+----+-----------------------------------------------------------------+
The first byte of the address format is full 1, which denote a multicast address.
z Flag field:
It consists of 4 bits.At present, only the fourth bit is specified. The bit is used to indicate
whether the address is a known multicast address specified by Internet Number
Constitution or a temporary multicast address used in a specific condition. If this flag