Automatic IPv6 due to broadcast

Enno Rey erey at
Mon Apr 23 11:49:15 CDT 2012


On Mon, Apr 23, 2012 at 12:27:53PM -0400, Valdis.Kletnieks at wrote:
> On Mon, 23 Apr 2012 11:23:14 -0400, Chuck Anderson said:
> > > On Mon, Apr 23, 2012 at 06:38:09AM -0700, Owen DeLong wrote:
> >> In a lot of cases, enforcing that all address assignments are via DHCP can still be
> >> counter-productive. Especially in IPv6.
> > If a specific managed environment provides DHCPv6 and doesn't provide
> > SLAAC, and the policies of said environment forbid static addressing,
> That's totally different from Owen's "in a lot of cases".  Incidentally,
> there's absolutely nothing

except for LLT being the default DUID generation mechanism on pretty much every OS...



 preventing a DHCPv* server from being configured to
> always hand out the same IP address to a given MAC address, making it
> effectively static (in fact, I've seen more than one site that carries nailed down
> DHCP entries for servers, just to ensure that even if the server gets borked and
> decides to DHCP itself, it will still come up with the "right" address anyhow).
> > how can enforcing the use of DHCPv6 be counter-productive?
> Remember, Owen was talking about "in a lot of cases". I suspect Owen was saying
> that if you enforce that all source addresses are ones that the DHCPv6 server
> handed out, you just broke a host that tries to do RFC4941 addresses or other
> similar things.

Enno Rey

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