Re: Some definitions (Was: Re: New issue 16: No packets from other end?)

Hello Jari,

a nice writeup. thanks. one comment below.

Jari Arkko wrote:

> Details:
> 
> 1.  Available Addresses
> 
>    MOBIKE nodes need to be aware of what addresses they themselves have.
>    If a node loses the address it is currently using for communications,
>    another address must replace this address. And if a node loses an
>    address that the node's peer knows about, the peer must be informed.
>    Similarly, when a node acquires a new address it may generally wish
>    the peer to know about it.
> 
>    Definition. Available address. An address is said to be available if
>    the following conditions are fulfilled:
> 
>    o  The address has been assigned to an interface of the node.
> 
>    o  If the address is an IPv6 address, we additionally require that
>       (a) the address is valid in the sense of RFC 2461, and that
>       (b) the address is not tentative in the sense of RFC 2462.  In
>       other words, the address assignment is complete so that
>       communications can be started.
> 
>       Note this explicitly allows an address to be optimistic in the
>       sense of [draft-ietf-ipv6-optimistic-dad] even though
>       implementations are probably better off using other
>       addresses as long as there is an alternative.
> 
>    o  The address is a global unicast or unique site-local address
>       [draft-ietf-ipv6-unique-local-addr].
> 
>       That is, it is not an IPv6 link-local or site-local address.
>       Where IPv4 is considered, it is not an RFC 1918 address.
> 
>    Available addresses are discovered and monitored through mechanisms
>    outside the scope of MOBIKE.  These mechanisms include IPv6
>    Neighbor Discovery and Address Autoconfiguration [RFC 2461-2462],
>    DHCP [RFC 3315], enhanced network detection mechanisms detected by
>    the DNA working group, and corresponding IPv4 mechanisms, such as
>    [draft-ietf-dhc-dna-ipv4].

this doesnt take into account some addresses that satisfy the above
conditions, but are restricted by certain policies on the MN. for
example, in an earlier mail, I had explained a scenario where I didnt
want MOBIKE to use an address configured from a low bandwidth GPRS
link to download email through a VPN tunnel.

Vijay