Jack,
>During w.g. last call, I suggested a change of wording in the
>definition of IPv4-mapped addresses (mail attached below). I
>see the suggestion was not incorporated in addr-arch-v3-01.
>Let me offer an example of what motivated my suggestion.
I did read and consider your suggestion. I should have gotten back in touch.
>Suppose we have 2 IPv6/IPv4 nodes: Node A has IPv6 address A::A
>and IPv4 address 1.2.3.4. Node B has IPv6 address B::B and IPv4
>address 5.6.7.8. Node A is running a server which is listening
>for both IPv4 and IPv6 connections on an AF_INET6 socket. A client
>on node B connects to node A's IPv4 address (1.2.3.4), with packets
>sourced from B's IPv4 address (5.6.7.8). (Why does the client use
>A's IPv4 address? Perhaps it is an AF_INET application that has
>not yet been upgraded, or perhaps the user entered 1.2.3.4.) The
>server on node A accepts the connection, and because it is using
>AF_INET6 sockets, accept() returns B's IPv4 address as ::FFFF:5.6.7.8.
>In this example, an IPv4-mapped address (::FFFF:5.6.7.8) is used
>to represent the address of an IPv6/IPv4 node (B).
>
>Is this correct usage of IPv4-mapped addresses? Or is it a violation
>of the architecture?
It is not the intended use of IPv4-mapped addresses, but I am not sure it
is a violation of the architecture either. From an protocol view, I don't
think it is possible for a node to tell if it is talking to an IPv4 only
node or an IPv4/IPv6 node. They have separate identities.
I am not widely enthusiastic about making this change. If folks think it
is necessary, I think it would be better to change it to:
This address is used to represent the addresses of IPv4 nodes
as IPv6 addresses.
instead of listing the exceptions one by one.
Comments...
Bob
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