Date: Fri, 29 May 2009 11:55:10 +0200
From: "Pascal Thubert (pthubert)" <[email protected]>
The current draft inherits source address validation text from the
backbone router draft that's meant to prevent nodes in the LoWPAN from
using any address as source.
section 7.5. about forwarding by Edge Routers has:
"
Upon receiving packets on one of its LoWPAN interfaces, the Edge
Router checks whether it has a binding for the source address. If
it does, then the Edge Router can forward the packet; otherwise,
the Edge Router MUST discard the packet.
"
That was fine for a backbone router in a mesh under
situation but that seems to falls short for route over,
because in that case the Edge Router is not necessarily
the first hop:
The check described in the passage above seems to be
guarding against the use of a source address that is not
bound within the LoWPAN. It doesn't appear to be concerned
with a LoWPAN node using a source address that is bound to
some other node in the same LoWPAN. For the former,
guarding against the use of an unbound source address, I
don't think it matters whether the Edge Router is the first
hop or not.
-Richard Kelsey
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