Date: Mon, 12 Aug 2002 22:34:39 -0400
From: "Bound, Jim" <[EMAIL PROTECTED]>
Message-ID:
<[EMAIL PROTECTED]>
| As long as if two networks merge the following is strictly prohibited:
|
| two nodes now appear on the network with:
|
| 4ff3::2
| 4ff3::2
Jim,
The idea is that DAD must be performed on any address before it
is configured. So, that wouldn't possibly work.
Of course, if someone just plugs two cable together, nodes aren't
going to do doing (re-doing) DAD on their addresses (any of them,
in either scenario) - this has always been recognised as one of the
failure modes for DAD, but so unlikely, and so hard to fix, that
it isn't worth bothering with.
| The implementation is that if two nodes have competing implementations.
| If one node checks the entire address and the other does not then we
| could end up with in practice in the field with what I want to be
| prohibited.
Yes, that's true - if there are implementations replying on DIID, and
checking only LL's using DAD, then such an implementation might config
an address that was already in use by a node that doesn't config LL's
for every address it has configured.
But it seems that there aren't actually any such implementations, everyone
I have seen who has reported has said they do DAD on all addresses before
configuring them. The fact that everyone did that was one of the
motivations for the change.
kre
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