2012/6/6 Mark Andrews <span dir="ltr"><<a href="mailto:marka@isc.org" target="_blank">marka@isc.org</a>></span><br><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<br>
In message <CABUciRkVT6mBS0ZS3WL4tS7uTPgYNVBkOr890fsB9OoqP=<a href="mailto:CeOQ@mail.gmail.com">CeOQ@mail.gmail.com</a>><br>
<div><div class="h5">, Alexander Gurvitz writes:<br>
> Hi.<br>
><br>
> TTL returned by YOUR zone authoritative server will (at least should) be<br>
> preferred by caches.<br>
><br>
> Matt Larson from verisign explained on these:<br>
><br>
> <a href="http://www.merit.edu/mail.archives/nanog/2004-07/msg00255.html" target="_blank">http://www.merit.edu/mail.archives/nanog/2004-07/msg00255.html</a><br>
><br>
> Regards,<br>
> Alexander Gurvitz,<br>
> <a href="http://net-me.net" target="_blank">net-me.net</a><br>
<br>
</div></div>TTL of NS records are complicated as the existance of the delegation<br>
is covered by the parents NS records but the contents of the NS<br>
records comes from the child zone. Named looks at both TTLs to<br>
determine when to remove the NS RRset.<br></blockquote><div><br>Mark, could you please describe the algorithm being used by BIND? Does it choose NS rrset with lowest TTL or something else?<br><br></div><blockquote class="gmail_quote" style="margin:0pt 0pt 0pt 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<br>
<a href="https://deepthought.isc.org/article/AA-00691/" target="_blank">https://deepthought.isc.org/article/AA-00691/</a><br>
<br>
If you are wanting to workout when to decommission a nameserver take the<br>
maximum of the two NS rrset after they have both been updated as when it<br>
is safe to decommission.<br>
<span class="HOEnZb"><font color="#888888"><br>
Mark<br>
<br>
--<br>
Mark Andrews, ISC<br>
1 Seymour St., Dundas Valley, NSW 2117, Australia<br>
PHONE: <a href="tel:%2B61%202%209871%204742" value="+61298714742">+61 2 9871 4742</a> INTERNET: <a href="mailto:marka@isc.org">marka@isc.org</a><br>
</font></span><div class="HOEnZb"><div class="h5">_______________________________________________<br>
Please visit <a href="https://lists.isc.org/mailman/listinfo/bind-users" target="_blank">https://lists.isc.org/mailman/listinfo/bind-users</a> to unsubscribe from this list<br>
<br>
bind-users mailing list<br>
<a href="mailto:bind-users@lists.isc.org">bind-users@lists.isc.org</a><br>
<a href="https://lists.isc.org/mailman/listinfo/bind-users" target="_blank">https://lists.isc.org/mailman/listinfo/bind-users</a><br>
</div></div></blockquote></div><br><br clear="all"><br>-- <br>AP<br>