DUID across VLANs

Enno Rey erey at ernw.de
Tue Sep 12 08:40:03 UTC 2017


Hi,

On Tue, Sep 12, 2017 at 10:28:44AM +0200, Miloslav H??la wrote:
> Hi,
> 
> I'm solving issue with DHCPv6 and Windows 10 connected by two interfaces 
> into two different VLANs. One for ordinary data, the other one for 
> network management.
> 
> Now, we have stations registered by MACs.
> 
> host milo.example.com {
>          hardware ethernet 00:13:3b:9c:9f:ab;
>          fixed-address6 2002:817:2:1100::ffff;
> }
> 
> I'm aware that this is not the "RFC way", but registration by DUID would 
> result into the same issue.
> 
> The problem is, that OS uses the same DUID for all ethernet interfaces. 
> It is nice from the end-user point of view, cable can be plugged into 
> any interface. But I need two separated IPv6 addresses for admin access 
> and some netadmin tests.
> 
> Is it possible somehow to achieve that?

unfortunately no (at least afaik).
by design the DUID is generated once per system and hence does not/should not (by design) depend on or be associated with an individual interface.

however if you use the MAC address for the reservations (and all devices involved support RFC 6939) you should be able to achieve what you have in mind (different DHCPv6-issued addresses for different interfaces).

cheers

Enno





> 
> Thank you, Milo
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