DHCPv6 Confirm in DOCSIS networks

[John Jason Brzozowski]

On Sat, May 19, 2012 at 10:59 AM, Tore Anderson <
tore.anderson at redpill-linpro.com> wrote:

> * John Jason Brzozowski
>
> > [jjmb] there are some other things we should discuss offline, perhaps
> > with your provider that I imagine are of interest.  contact me at work
> > if you wish to discuss.
>
> I'll certainly take you up on this offer, thanks! My contact in Get (my
> provider) is busy with non-IPv6 stuff in the next week though.
>
[jjmb] anytime.

>
> >     No preference values are being transmitted in the ADVERTISE messages.
> >     Hmm. I've had my PD prefix change on me once already, and that's the
> >     probably the reason. Unlike my laptop, my HGW (a ZyXEL P2812) sends
> >     RELEASE once its WAN port goes down, and starts the DHCPv6 client
> state
> >     machine from scratch (with SOLICIT) once it comes back up. So I guess
> >     that would mean it's a coin's toss whether I get back the same
> prefix I
> >     had before, or if I get the prefix offered by the other DHCPv6
> server.
> >     Which is rather problematic, as the ZyXEL doesn't handle LAN
> renumbering
> >     very well, so I get left with stale and non-working addresses from
> the
> >     old prefix on the hosts.
> >
> > [jjmb] you should get your PD renewed, your operator may have to tweak
> > some CNR settings.  CNR has great support for IPv6.  I worked with that
> > team (include Bernie) over 6 years ago to  help put it there.
>
> The problem is that my HGW will immediately forget all about the PD as
> soon as you unplug the WAN port. I would imagine that this runs counter
> to various RFCs, but that's how it behaves. So when I reconnect it to
> the cable modem, it won't try to renew/confirm any previously received
> IA_PD (or IA_NA for that matter), it starts the DHCPv6 client completely
> from scratch. So if there's two DHCPv6 servers, offering two different
> IAs, the chance of getting back my old prefix would be fifty-fifty,
> right? (Assuming the Preference option isn't included in the ADVERTISE
> messages, that is.)
>
[jjmb] time for a new router, try dlink. ;)

>
> >     Currently I only get only one ADVERTISE message though, so perhaps
> >     they're working on improving this as we speak.
> >
> > [jjmb] perhaps or they have a separate, single server for IPv6.
>
> They had two servers a couple of days ago, but now I see only one. So
> perhaps they shut down one in order to implement the Preference option.
> Or one crashed. No idea really. It's still at a early pilot stage so I
> can imagine they feel free to change stuff around without notifying me. :-)
>
[jjmb] have them contact me off list, I can give them some guidance.

>
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>
> BR,
> --
> Tore Anderson
> Redpill Linpro AS - http://www.redpill-linpro.com/
>



-- 
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John Jason Brzozowski
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