Alex,
Alexandru Petrescu wrote:
one-interface routers and links (again)
Let me first describe one-interface routers as I understand are proposed
in 6LoWPAN:
+------------------------+---------------+
| | |
2001:db8:1::1/128 2001:db8:1::2/128 2001:db8:1::3/128
_|eth0 _|eth0 _|eth0
|R1 | |R2 | |R3 |
--- --- ---
R1 sends an IP packet to R3 but this reaches only R2. R2 picks the
packet, looks at the dst address, finds it's not for self, consults
routing table, finds a host-based route and sends it to R3. This can
work ok.
Exactly, you pictured this nicely. This is how LoWPAN Routing works.
I'll get back to the definition of that in your other thread.
Now let me picture the same thing, but with The Link:
The Link
+------------------------+---------------+
| | |
2001:db8:1::1/128 2001:db8:1::2/128 2001:db8:1::3/128
_|eth0 _|eth0 _|eth0
|R1 | |R2 | |R3 |
--- --- ---
If there is a such link which links together all nodes then R1 would
communicate directly to R3, by definition, no need to IP route. Could
you please clarify why do IP routing then?
Then obviously, you don't need to perform LoWPAN Routing. This kind of
(transitive) link occurs when all nodes are in radio range of
each-other, or if the link technology is forming some kind of mesh
underneath IP.
In the ND draft this is really all that "mesh-under" means. It means we
don't need to do LoWPAN Routing, nor do we even need nodes playing a
Router roll.
And picture the same with 2 links:
link1 link2
+------------------------+---------------+
| | |
2001:db8:1::1/128 2001:db8:1::2/128 2001:db8:1::3/128
_|eth0 _|eth0 _|eth0
|R1 | |R2 | |R3 |
--- --- ---
But in this figure R2 would need to have two MAC addresses on the same
interface, because it is in two different links. I'm not aware of such
interfaces with two MAC addresses. Could you please clarify?
This doesn't exist if links are defined as you have.
Alex
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