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
____________________________________________________________________________ __ ______ Take the Internet to Go: Yahoo!Go puts the Internet in your pocket: mail, news, photos & more. http://mobile.yahoo.com/go?refer=1GNXIC
********************************************** 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.
********************************************** 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.