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Re: [6lowpan] How to find the mailbox? (related to "Advertize on Behalf")

Richard Kelsey <richard.kelsey@ember.com> Wed, 30 March 2011 12:52 UTC

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Date: Wed, 30 Mar 2011 08:53:51 -0400
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To: Anders Brandt <abr@sdesigns.dk>
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From: Richard Kelsey <richard.kelsey@ember.com>
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Cc: cabo@tzi.org, 6lowpan@ietf.org
Subject: Re: [6lowpan] How to find the mailbox? (related to "Advertize on Behalf")
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> Date: Wed, 30 Mar 2011 08:08:19 +0200
> From: "Anders Brandt" <abr@sdesigns.dk>
>  
> As mentioned yesterday, there is a distinction between Frequently
> Listening (a.k.a duty cycled nodes) and what I call call-back nodes,
> i.e. nodes that depend on a router holding a mailbox for that node.
> Whether that mailbox feature is provided by any router, a few
> specialiezed routers or the border router is a network implementation
> decision.

As you point out, there are lots of ways to do this.  No one
solution is going to work for everyone.  At one extreme this
can all be handled by the link layer.  It shouldn't matter
to the higher layers if a message is polled for, transmitted
according to some known schedule, or unicast immediately.

At the other end of the spectrum, it can all be handled at
the application layer, with the application polling to some
centralized mailbox which may be anywhere.

The middle ground, where ND and/or routing get involved,
seems dangerous to me, exactly because so many different
approaches are possible.
                                  -Richard Kelsey

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