> Assuming you send a binding-update in the SYN, then
> communication using the
> home address will be relatively efficient - just a little
> more overhead in
> the packets, but no extra packets and no packets going
> through the home
> agent.
>
> => even the idea of a binding-update in the SYN seems nice
> this will not
> work like this a the real word because the binding-update must be
> authentic ie a security association must be established before.
> If you use IKE with certificates then this can be more expensive than
> to go through the tunnel and can add a delay before the connection
> set up.
Well, that's a good point - I'd forgotten about the security overhead of
protecting the binding update. But I still think the default should be for a
mobile node to use a home address instead of a care-of address, unless there
is app or user guidance (like the "this is a short-lived socket" option).
Rich
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