RE: ipv6 dns server.

Wise or not, that is the standard. If you are using an ISP that does not support
IPv6, and don't have tunneled IPv6 service, in most cases, you would not need
to have an IPv6 stack installed on your node. In that case, the "preferred" IPv6
address returned by DNS for a dual stack node (e.g. www.kame.net) would be
ignored, as there would be no way to use it on an IPv4 only node. 
 
If you have installed an IPv6 stack, but for some reason, don't have IPv6 access
to the outside world, what typically happens when you get both addresses from
DNS is that the first connection over IPv6 times out then a good connection is
made over IPv4. 
 
Note that in Asia, many ISPs now provide direct IPv6 service. Europe is starting
to migrate. The US is WAY behind in this, and may well lose its lead in the 
Internet because of this. China, Japan and Korea may well dominate the next
generation and the US will be a backwater as things are shaping up. The US
government is about the only bright spot at the moment (due to GAO and OMB
mandates). They must migrate by June 2008 (DoD by Feb 2008). 
 
Even in the US, you can get direct IPv6 service from NTT America (nee Verio).
You can get tunneled service over existing IPv4 connections anywhere in the
world (even in the US). See www.hexago.com or Hurricane Electric, among
others (not affiliated with either, but have used both).
 
Having the IPv6 address be preferred if both v4 and v6 addresses are returned
(but only if the node supports IPv6) is necessary for the smooth migration to
dual stack and later pure IPv6. The only problems occur in situations where
the migration is started but not yet complete (at least to dual stack), then the
worst case is a short timeout before connection.
 
 

________________________________

From: [email protected] on behalf of Kenneth Porter
Sent: Wed 1/4/2006 2:05 AM
To: [email protected]
Subject: RE: ipv6 dns server.



--On Monday, January 02, 2006 4:02 AM +0800 Lawrence Hughes
<[email protected]> wrote:

> Most client computers (DNS resolvers) that support IPv6 will (and should)
> use the IPv6 addresses preferentially over IPv4 when both are returned
> from the DNS.

With most ISP's not providing an IPv6 gateway, is that yet wise? Even
Speakeasy, one of the more technically competent ISP's, doesn't yet provide
native IPv6.
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