<br><br><div class="gmail_quote">On Mon, Mar 17, 2008 at 3:46 AM, Erik Kline <<a href="mailto:ek@google.com">ek@google.com</a>> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
2008/3/16 Kevin Day <<a href="mailto:toasty@dragondata.com">toasty@dragondata.com</a>>:<br>
<div><div></div><div class="Wj3C7c">><br>
> On Mar 16, 2008, at 9:34 PM, Erik Kline wrote:<br>
> > Speaking personally, I have seen analysis of neither client behaviour<br>
> > nor connectivity in the IPv6 Internet today. Are things really as bad<br>
> > as folks say or is it partly a kind of "urban legend of horribleness"<br>
> > that persists from earlier tests with less-mature operating systems<br>
> > and less reliable connectivity? I just have 6to4 at home and my Mac,<br>
> > Linux, and XP boxes all seem to work just fine.<br>
><br>
> Every few months I've performed this test on a rather high traffic<br>
> (but probably tiny compared to what you're used to) website that's<br>
> comprised mostly of completely non-technically savvy users. The reason<br>
> I feel the "non-technical users" part is important is because if one<br>
> of us realizes that we can't reach <a href="http://www.ripe.net" target="_blank">www.ripe.net</a>, we go fix it - most<br>
> users think "oh, the internet is broken" and move on to something<br>
> else. This results in problems going unresolved. :)<br>
><br>
> On one page of this site, we put two 1x1.gif images.<br>
><br>
> ipv4.gif is on a hostname that has only a v4 A record. This gets a<br>
> baseline of how many people loaded the images on the site at all.<br>
> 4or6.gif is on a hostname that has both AAAA and A records.<br>
><br>
> The order the two images appeared on the page was randomized on every<br>
> page load to try to reduce any bias there. I measured how many times<br>
> each image was loaded after a few hours. Results from the last time I<br>
> attempted this, after removing duplicate IPs:<br>
><br>
> ipv4.gif was loaded 278821 times.<br>
> 4or6.gif was loaded 278704 times. (191 hits were on the v6 IP, 278513<br>
> on the v4 IP)<br>
><br>
> The good news is that 0.069% of our viewership was able to load an<br>
> image on the v6 IP of an AAAA record. Nearly all of these were 6to4<br>
> addresses, with a few Teredo. I only saw 2 IPs that looked like native<br>
> v6.<br>
><br>
> The bad news is that the image on the AAAA record was loaded 0.042%<br>
> less than the one on the A record. This meant that by publishing an<br>
> AAAA record, your site would appear broken to almost as many users as<br>
> would benefit from having the v6 connectivity.<br>
><br>
> I did some troubleshooting with as many users as I could that were<br>
> willing to look at why they weren't able to access the host on the<br>
> AAAA record, but didn't get very far with most of them before they<br>
> lost interest with troubleshooting. In most cases it seemed like users<br>
> had ended up with v6 activated/configured when they had no v6<br>
> connectivity. None of the problems appeared to be broken v6<br>
> connectivity exclusive to our site - if the user couldn't reach our<br>
> site on an AAAA record, they couldn't reach any AAAA hostnames.<br>
><br>
> -- Kevin<br>
><br>
><br>
<br>
</div></div>That's actually fairly promising, it would seem, as a measure of<br>
successful connectivity and good client behaviour. Thanks!</blockquote><div><br>I guess the question is if that figure is increasing over time as clients more and more are purchased 'v6 enabled' ?<br><br>Kevin - do you have any time based data on that?<br>
<br>Steve<br><br> </div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><br>
An additional concern would, of course, be performance (i.e. latency).<br>
If a client can cope appropriately with a AAAA record and it takes<br>
advantage of its IPv6 connectivity but suddenly finds itself going<br>
through tunnels or across continents to the "nearset" <a href="http://192.88.99.1" target="_blank">192.88.99.1</a> 6to4<br>
relay the overall user experience could, theoretically, be much, much<br>
poorer. And poor performance obvious has a direct impact on user<br>
happiness.<br>
</blockquote></div><br><br>-- <br>Global Infrastructure<br>Google Inc.