I am looking into possible MIPv6 APIs as an extension to IPv6 Adv-API
document. The following requirements in MIPv6 spec indicates that there
is a need for Socket API which will allow the MIPv6 applications to
choose
COA as mobile node's source address (in a visited network), while
default
address selection draft prefers home address as the default source
address
(section 5 and 6 rule 4). The MIPV6 API should also take care of
choosing
temporary address and non-temporary address from the application level.
Also, there is a need to choose link-local or site-local address as
source
address (depending on the scope) for the MN while visiting (see below).
My question is, if anybody in IPv6 working group is currently working on
such
API for default address selection draft ?
If not, I propose to add these APIs to the MIPv6 Advanced API document,
as they are quite Mobile IP specific in usage.
-Samita
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Mobile IPv6 draft 19 Section 11.3.1 states,
The mobile node MAY choose to directly use one of its care-of
addresses as the source of the packet, not requiring the use
of a Home Address option in the packet. This is particularly
useful for short-term communication that may easily be retried
if it fails. An example of this type of communication might
be DNS queries sent by the mobile node [27, 28]. Using the
mobile node's care-of address as the source for such queries will
generally have a lower overhead than using the mobile node's
home address, since no extra options need be used in either
the query or its reply. Such packets can be routed normally,
directly between their source and destination without relying
on Mobile IPv6. If application running on the mobile node has
no particular knowledge that the communication being sent fits
within this general type of communication, however, the mobile
node SHOULD NOT use its care-of address as the source of the
packet in this way.
: : :
While not at its home link, the mobile node MUST NOT use its home
address (or the home address destination option) in Neighbor
Discovery messages on the visited link. The mobile node also
MUST NOT use its home address when communicating with link-local
or site-local peers on the visited link, if the scope of the home
address is larger than the scope of the peer's address.
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