Re:AWS and their billions in IPv4 addresses
by jlgaddis on Tuesday October 20, 2020 @06:20PM
(#24842913)
> Easy, just declare that the entire IPv4 address space is ::x.x.x.x in IPv6 and Bob’s your uncle. No idea why they didn’t do this other than sheer solipsism.
They did [0,1]:
The "IPv4-Compatible IPv6 address" was defined to assist in the IPv6
transition. The format of the "IPv4-Compatible IPv6 address" is as
follows:
| 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.
They did [0,1]:
--[0]: https://tools.ietf.org/html/rfc4291#section-2.5.5.1
[1]: https://en.wikipedia.org/wiki/IPv6#IPv4-mapped_IPv6_addresse...