Question on DHCPv6 address assignment

Henri Wahl h.wahl at
Sat Feb 1 21:18:24 CET 2014


> 1) What's the pattern with which addresses are generated/assigned? Are
> they sequential (fc00::1, fc00::2, etc.)?  Random? Something else?
We use our dhcpy6d ( which allows 4
different address categories:
- sequential range like fd00::1, fd00::2
- completely random /64 like with privacy extensions:
- plain MAC address like fd00::2034:d4f1:439a
- some arbitrary id number given in client configuration like fd00::1,

See for
This way one can hand out for example 2 addresses to clients, one random
privacy-aware global and one range or MAC-based for internal use. The
bad news is that only Windows 7+ is capable of handling more than one
address given by DHCPv6 out of the box. Linux has to be tweaked not to
use Network-Manager and MacOS fails completely - maybe would work with
some dhclient or dibbler-client.

> 2) What about their stability? Is there any intent/mechanism for them to
> be as "stable" as possible? Or is it usual for hosts to get a new
> address for each lease?

MAC and ID based addresses are of course stable, the range based ones
intend to be too and the random ones are regenerated whenever a lease

Best regards

Henri Wahl

IT Department
Leibniz-Institut für Festkörper- u.
Werkstoffforschung Dresden

tel. (03 51) 46 59 - 797
email: h.wahl at

IFW Dresden e.V., Helmholtzstraße 20, D-01069 Dresden
VR Dresden Nr. 1369
Vorstand: Prof. Dr. Ludwig Schultz, Dr. h.c. Dipl.-Finw. Rolf Pfrengle

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