[v6test] Another last minute update

[Steve Bertrand]

Llarian wrote:
> On Wed, 4 Jun 2008, Koos van den Hout wrote:
>> I am really really interested in the research in DNS issues. Will putting
>> AAAA records in the DNS for 'main' resources cause troubles. All those
>> .ipv6. names are nice, but for real adaptation of IPv6 it would work
>> best if there wasn't an http://ipv6.google.com/ but just an AAAA record
>> for www.google.com. Yes, I can imagine several very good reasons for
>> google to not take this step yet.
> 
> Absolutely agreed.  I've been silently adding more and more AAAA records 
> for existing A records as I add v6 bindings for them.  One thing I have 
> found is that its very seamless for me as I switch from v4 and v6 enabled 
> workstations.  However, I tend to always have v6 available in most of the 
> places I'm typically using my machines, and I don't run Vista, which I'm 
> told causes a majority of the problems.  Its a pity I can't get any real 
> information for how many users attempted to connect to an AAAA without 
> having v6 network access.

I've been doing this for my own personal server for some time now, but 
have not had much opportunity to put much time into testing connectivity 
issues/delays due to the DNS config from many locations or circumstances.

I certainly will be though. So far, I haven't noticed any problems, and 
none have been reported to me. However, the conditions have been ideal 
(no v4 or v6 outages etc). If I get a chance this week to do any 
decently organized and controlled testing regarding this, I'll post the 
results and what I find.

Where I honestly see problems arising are on OS's that may not have 
fully (up to now) compliant v6 stacks, that when they resolve an 
address, collect both AAAA and A records, have IPv6 enabled by default 
without a working gateway (or badly broken src/dst selection algorithm 
implementations) may never try the v4 address. This of course is only 
just my own thinking until I test it.

It really is a pity that there is no decent way to garner up stats on 
AAAA hits from enabled-but-not-connected IPv6 clients.

One point of interest, since I've flipped the DNS switch, ~25% 
(~800/day) of all email to the handful of domains on this box is over 
IPv6 (several mailing lists), but I have yet to receive any SPAM.

Steve
> 
> -D
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