Hi,
OK, I think that is a "wrap". I just submitted it to be an ID.
Thanks for the comments and editorial suggestions. The deprecation text is much improved.
The updated deprecation and IANA text that will be in the new draft is include below.
Thanks, Bob
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2.5.5 IPv6 Addresses with Embedded IPv4 Addresses
Two types of IPv6 addresses are defined that carry an IPv4 address in the low-order 32 bits of the address. These are the "IPv4-Compatible IPv6 Address" and the "IPv4-Mapped IPv6 Address".
2.5.5.1 IPv4-Compatible IPv6 Address
The "IPv4-compatible IPv6 address", was defined to assist in the IPv6 transition. The format of the "IPv4-compatible IPv6 address" is:
| 80 bits | 16 | 32 bits | +--------------------------------------+--------------------------+ |0000..............................0000|0000| IPv4 address | +--------------------------------------+----+---------------------+
Note: The IPv4 address used in the "IPv4-compatible IPv6 address" must be a globally-unique IPv4 unicast address.
The "IPv4-compatible IPv6 address" is now deprecated because the current IPv6 transition mechanisms no longer use these addresses. New or updated implementations are not required to support this address type.
2.5.5.2 IPv4-Mapped IPv6 Address
A second type of IPv6 address that holds an embedded IPv4 address is defined. This address type is used to represent the addresses of IPv4 nodes as IPv6 addresses. The format of the "IPv4-mapped IPv6 address" is:
| 80 bits | 16 | 32 bits | +--------------------------------------+--------------------------+ |0000..............................0000|FFFF| IPv4 address | +--------------------------------------+----+---------------------+
See [RFC4038] for background on the usage of the "IPv4-mapped IPv6 address".
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4. IANA Considerations
The "IPv4-compatible IPv6 address" is deprecated by this document. The IANA should continue to list the address block containing this address as "Reserved by IETF" and not reassign it for any other purpose.
The IANA should update the references for the IPv6 Address Architecture in the IANA registries to this RFC when it is published.
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