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Re: [CGA-EXT] Hashed DAD

"Pars Mutaf" <pars.mutaf@gmail.com> Thu, 28 February 2008 23:29 UTC

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Message-ID: <18a603a60802281529s19759d29wce83afab7225240f@mail.gmail.com>
Date: Fri, 29 Feb 2008 00:29:22 +0100
From: Pars Mutaf <pars.mutaf@gmail.com>
To: Suresh Krishnan <suresh.krishnan@ericsson.com>
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References: <18a603a60802281139x220a6227j24d9b0234c65b71b@mail.gmail.com> <47C72E84.9010000@ericsson.com> <18a603a60802281459v74339060tba68afa657ad3052@mail.gmail.com> <47C73E7A.2040904@ericsson.com>
Cc: cga-ext@ietf.org
Subject: Re: [CGA-EXT] Hashed DAD
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Hello,

On Fri, Feb 29, 2008 at 12:06 AM, Suresh Krishnan
<suresh.krishnan@ericsson.com> wrote:
> Hi Pars,
>
>
>  Pars Mutaf wrote:
>  > Hello,
>  >
>  > On Thu, Feb 28, 2008 at 10:58 PM, Suresh Krishnan
>  > <suresh.krishnan@ericsson.com> wrote:
>  >> Hi Pars,
>  >>    There are not much details to go on, but I can already see that there
>  >>  are a couple of issues with this approach.
>  >>
>  >>  * It works only if ALL NODES in the network support your upgraded
>  >>  specification, since if there is even one unupgraded node it will
>  >>  destroy your scheme. This makes this proposal a non-starter.
>  >
>  > At first look, I would say if an unupgraded node configured
>  > the address hash(X), it would defend the address hash(X).
>  > The DADing node can discard it because it wants the address X  ?
>
>    An unupgraded node wants to configure address X. An upgraded node
>  (that has already configured X on one if its interfaces) receives this
>  packet. It creates Hash(X) and compares it to the address sent by A
>  (i.e. X) and does not find a match. Hence it does not defend its address.

I assumed that an upgraded node would also know traditional DAD, so it
would defend X against the traditional node. This would be diffilcult
to achieve?

For example, in hashed DAD you can indicate in the packet that the target
address field carries the hash of the actual target address. Otherwise, this is
traditional DAD and we act accordingly.

Thanks,
pars

>
>  Cheers
>  Suresh
>
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