[ipv6hackers] Win7 - no managed flag, DHCP address released?!?

[Karl Auer]

[I sent this to the IETF list and they suggested I repost it here.]

I have just seen the following demonstrated.

Two routers, short RA interval, both sending RAs for the same prefix,
both with the autoconf flag set, one with the managed flag set and one
without.

A Windows 7 host gets an address via DHCPv6 when the RA with the managed
flag comes around - and DROPS IT when an RA without the managed flag
comes past.

This is not the valid lifetime expiring normally. I was not able to
determine whether the Windows host is actually sending a DHCPv6 release
as well, but it is most certainly dropping the address from the
interface.

I will be trying to do my own tests to confirm (or not) this behaviour,
but has anyone else seen it? Or seen it with other operating systems?

If it is indeed happening, this behaviour seems very badly broken to me.
I don't feel the relevant RFCs can reasonably be interpreted as
supporting this behaviour.

Regards, K.

-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Karl Auer (kauer at biplane.com.au)
http://www.biplane.com.au/kauer
http://www.biplane.com.au/blog

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