[Dnsmasq-discuss] DHCPv6 and MAC

Simon Kelley simon at thekelleys.org.uk
Tue Feb 4 20:58:33 GMT 2014

On 29/01/14 09:53, Shai Venter wrote:
> Hello /Simon Kelley/
> Referring to
> http://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2013q1/006818.html
> The thread mainly focuses on Operating System side of a IPv6 dhclient
> functions.
> But here are other aspects of the issue, more difficult to figure out:
> The World of UEFI IPv6 network boot agents residing on a system’s FW
> (a.k.a UNDI)
> Host Management (BMC’s) that support IPv6
> For those two dhclients, an administrator’s nightmare begins in trying
> to understand what DUID approach was chosen by the original manufacturer
> ( the vendor )
> And that would only go down the hill if more than one NIC exist in the
> system
> Can you please comment on that, knowing what you know on DUID approach
> How can a network administrator have control of the IP address
> assignment for specific clients, in a DHCP server/dnsmasq config, to
> clients of the types I described above
> This is just food for thought …
> Shai Venter,
> NIC FW QA engineer
> Mellanox Technologies LTD

The whole DUID approach sucks badly when you want to provision 
equipment. Most times, even if there's a stable DUID associated with 
each piece of hardware, there's no way to enumerate that into a 
provisioning database ahead of actually doing the provisioning. 
Data-centre jockeys have managed to persuade the builders of blade 
systems, servers, and storage gear that they need a way to harvest 
hardware-IDs, after a long struggle, and what they've got is a way to 
harvest MAC addresses. Therefore you need to be able to provision using 
MAC addresses.

Note that things are improving with DHCPv6, the latest release of 
dnsmasq _can_ associate IPv6 addresses with MAC addresses.



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