DHCPv6 client classification based on DUID.

Chris Buxton chris.p.buxton at gmail.com
Wed Sep 19 22:47:33 UTC 2012

On Sep 19, 2012, at 2:06 PM, Ted Lemon wrote:
> On Sep 19, 2012, at 4:51 PM, Chris Buxton <chris.p.buxton at gmail.com> wrote:
>> Also, parsing the DUID looking for (part of) a MAC address is a protocol violation. DHCPv6 should never even see the MAC address, let alone act upon it. (Not yet, anyway...)
> No, it's not.   This wasn't well worded, but the key point of that bit of the specification was that the DUID be used as an opaque key when looking up bindings, not that the server isn't allowed to look at what's in the DUID at all ever.

Always happy to be corrected. Thank you for that.

Let me state the problem differently, as I understand it: The client ID doesn't have to contain the client's MAC address, and does not reliably follow any pattern whatsoever across all implementations. Therefore, parsing the client ID to find the MAC address is not a reliable method.

Chris Buxton
BlueCat Networks
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