Re: WG next steps

[Masataka Ohta <mohta@necom830.hpcl.titech.ac.jp>]

Tony Li;

> Not necessarily.  If the network layer provided the transport with
> an opaque handle for each path, then the transport layer wouldn't
> have to touch locators at all.  The network layer would still
> need to inform the transport layer of path changes, but again, this
> could be done via the handle.

The interaction is more complex.

For example, if the current path fails, it is detected by the
transport/applicaiton layer. Thus, it is necessary for the
transport/application layer tell the network layer use an alternative
locator.

Later, as the original path may be resumed, it is also necessary
for the transport/application layer tell the network layer try an
old locator. Note that there may be several old locators.

To do so, transport/application layer and network layer must have
common identification mechanism of locators.

It is much easier for the transport/applicaiton layer to handle
locators directly. Then, all the information necessary for
transport/application layer control is included in the IP header.

						Masataka Ohta