Re: IPv6 & DNS

[JORDI PALET MARTINEZ <jordi.palet () consulintel es>]

Below, in-line.

Regards,
Jordi




> De: Stephen Wilcox <steve.wilcox () packetrade com>
> Responder a: <owner-nanog () merit edu>
> Fecha: Sat, 30 Jun 2007 14:23:37 +0100
> Para: JORDI PALET MARTINEZ <jordi.palet () consulintel es>
> CC: <nanog () nanog org>
> Asunto: Re: IPv6 & DNS
>
>
> On Fri, Jun 29, 2007 at 06:57:30PM -0400, JORDI PALET MARTINEZ wrote:
> > This is one more reason, some OSs may not support IPv6 DNS transport, so you
> > need to keep dual stack.
>
> The OS, IPv6, udp/tcp and DNS are all at different layers of the protocol
> stack.. we are supposed to be able to seamlessly switch out lower layers
> without the upper layers needing to be aware. This seems to be proving
> difficult.

Because in fact, most of the IPv6 implementations today are not really
"dual-stack" but hybrid-stack, in the sense that 80% of the stack is the
same. You can definitively "turn-off" IPv4 by not setting up a DHCP server
neither manual configuration, the effect is the same.

Hybrid stacks are very important because then the "dual-stack" takes 120% of
the code instead of 200%, which in a PC is not relevant, but it is in a
cellular phone, PDA, sensor, etc.

But as said, IPv6 was designed having in mind a smooth transition including
dual-stack. Nothing is wrong when IPv6 "alone" doesn't work today. Is like
trying to use only gas in an engine that requires a mix of gas and oil. It
is something wrong ? No, it is the way you try to use the engine, because
was not designed that way !

> > Also, if roots/TLDs do not support yet IPv6, you will need to have at least
> > a dual stack DNS in your network.
>
> No, I just wont bother with v6! If this thing doesnt 'just work' why am I
> going to spend time and effort trying to use it for negative gain?
>
> > I think in the long term we will be there, using IPv6-only in LANs, but
> > don't see the reason, at least not an immediate one, unless you've a very
> > specific scenario/business case, and then you probably need to have
> > translators at the edge, and then it may resolve the DNS issue also for you.
>
> Why would I need it in a LAN? I can use RFC1918 if I want to be an island and
> then I dont have to put in kludges or talk my users through why their apps
> arent working, that will also resolve the DNS issue :)

In fact, I have not talked about public IPv4 addresses at all ! As explained
in another message, we are doing large IPv6-only deployments (5.000 sites).
The "only" applies to the core and access network, but we keep
net10+NAT+IPv6 in the LANs.

> Steve
>
> > > De: David Barak <thegameiam () yahoo com>
> > > Responder a: <owner-nanog () merit edu>
> > > Fecha: Fri, 29 Jun 2007 10:19:05 -0700 (PDT)
> > > Para: <nanog () merit edu>
> > > Asunto: IPv6 & DNS
> > >
> > >
> > >
> > > --- Barrett Lyon <blyon () blyon com> wrote:
> > >
> > > > I don't see any v6 glue there...  Rather than having
> > > > conversations 
> > > > about transition to IPv6, maybe we should be sure it
> > > > works natively
> > > > first?  It's rather ironic to think that for v6 DNS
> > > > to work an  
> > > > incumbent legacy protocol is still required.
> > >
> > > Consider that Windows XP (and server 2k3) will not,
> > > under any circumstance, send a DNS request over IPv6,
> > > and yet they were widely considered "IPv6 compliant."
> > >
> > > Consider also how long it took to get a working way of
> > > telling autoconfigured hosts about which DNS servers
> > > to use (without manually entering 128-bit addresses).
> > >
> > > To me, the above show that the bulk of the actual
> > > deployments were in dual-stack or tunnel environments,
> > > and greenfield implementations were few and far
> > > between.  There's a surprising amount of unexplored
> > > "here be dragons" territory in IPv6, given how long
> > > some very smart people have been working on it.
> > >
> > > -David Barak
> > >
> > > David Barak
> > > Need Geek Rock?  Try The Franchise:
> > > http://www.listentothefranchise.com
> > >
> > >
> > >        
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> >
> >
> > **********************************************
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> >
> > Bye 6Bone. Hi, IPv6 !
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> >
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**********************************************
The IPv6 Portal: http://www.ipv6tf.org

Bye 6Bone. Hi, IPv6 !
http://www.ipv6day.org

This electronic message contains information which may be privileged or confidential. The information is intended to be 
for the use of the individual(s) named above. If you are not the intended recipient be aware that any disclosure, 
copying, distribution or use of the contents of this information, including attached files, is prohibited.