<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class=""><div><blockquote type="cite" class=""><div class="">On Sep 19, 2016, at 8:40 AM, Tony Finch <<a href="mailto:dot@dotat.at" class="">dot@dotat.at</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="">/dev/rob0 <<a href="mailto:rob0@gmx.co.uk" class="">rob0@gmx.co.uk</a>> wrote:<br class=""><blockquote type="cite" class=""><br class="">If you're thinking that you can do this replication to improve DNS<br class="">performance, you're right, it will do that. But it certainly will<br class="">not scale (if it's even possible to get axfr/ixfr), and it won't<br class="">handle modern CDN systems properly.<br class=""></blockquote><br class="">BIND 9.10 and later will keep popular domains in the cache by prefetching<br class="">them if they are looked up shortly before they will expire. So trying to<br class="">keep local copies of popular zones is less helpful than it used to be.<br class=""><br class="">(Unfortunately the prefetch option isn't mentioned in the HISTORY file so<br class="">I had to dig through the CHANGES to remind myself when it was introduced!)<br class=""><br class=""></div></div></blockquote><div><br class=""></div>We do have a matrix that shows when significant new features were added. Of course not every change is on there, but pre-fetch is.<div class=""><br class=""></div><div class=""><a href="https://kb.isc.org/article/AA-01310/109/BIND9-Significant-Features-Matrix.html" class="">https://kb.isc.org/article/AA-01310/109/BIND9-Significant-Features-Matrix.html</a></div><div class=""><br class=""><div><blockquote type="cite" class=""></blockquote></div></div><blockquote type="cite" class=""><div class=""><div class="">Tony.<br class="">-- <br class="">f.anthony.n.finch <<a href="mailto:dot@dotat.at" class="">dot@dotat.at</a>> <a href="http://dotat.at/" class="">http://dotat.at/</a> - I xn--zr8h punycode<br class="">Tyne, West Dogger: Northerly 4 or 5. Slight. Occasional rain. Moderate or<br class="">good, occasionally poor.<br class="">_______________________________________________<br class="">Please visit <a href="https://lists.isc.org/mailman/listinfo/bind-users" class="">https://lists.isc.org/mailman/listinfo/bind-users</a> to unsubscribe from this list<br class=""><br class="">bind-users mailing list<br class=""><a href="mailto:bind-users@lists.isc.org" class="">bind-users@lists.isc.org</a><br class="">https://lists.isc.org/mailman/listinfo/bind-users<br class=""></div></div></blockquote></div><br class=""><div class="">
<div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class="">Victoria Risk</div><div class="">Internet Systems Consortium</div><div class=""><a href="mailto:vicky@isc.org" class="">vicky@isc.org</a></div><div class=""><br class=""></div></div><br class="Apple-interchange-newline"><br class="Apple-interchange-newline">
</div>
<br class=""></div></body></html>