At 1:05 PM -0700 5/24/00, Richard Draves wrote:
> > It would also be good if common apps made it very easy for the user to
> > override the default behavior and force use of the COA address as the
> > source, for those cases when the user (a) knows that the
> > destination is "close" and (b) doesn't plan to move before the session
> > ends or doesn't care if a move breaks the session.
>
>I can imagine having a "this is short-lived" socket option, and if the app
>sets the option then the stack would prefer care-of addresses over home
>addresses instead of the other way around. This is the app telling the stack
>that your condition (b) holds.
That sounds like a promising idea.
> I don't see the importance of condition (a).
I presume another UI option that would be desirable on a mobile node is
a "privacy" switch that prevents binding updates from being sent, and
also tunnels mobile->correspondent packets via the home agent, so as
not to reveal the current (network) location to correspondents. When
operating in such a mode, the performance impact of having all of one's
packets dogleg-routed through the home agent might be very undesirable,
especially when the mobile and correspondent are on one continent and
the home agent is on another.
Another possible reason for user-specified use of the COA address instead
of the home address is to be able to communicate even when the the user's
home agent(s) are down or unreachable for whatever reason.
I'm not adamant about this, but I think it's worth considering.
>If this option is going to be useful, it needs to be something that the app
>can decide - having UI for this would not be good.
Where the app can make a good enough decision, it should. But I think
there should also be a way for users (perhaps only geek users) to override.
Steve
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