It is a web server and the users are going to be largely IE-based... thanks for painting the picture for me. <br><br><div class="gmail_quote">On Mon, Apr 21, 2008 at 11:54 AM, Andrew Zbikowski <<a href="mailto:andyzib@gmail.com">andyzib@gmail.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;"><div class="Ih2E3d">> Changing your DNS records on the fly works until you run in to pesky caching<br>
> DNS servers. You can crank down your TTLs in an attempt to compensate, but<br>
> then you have to be able to deal with the increased load from that.<br>
<br>
</div>Web browsers also keep their own DNS cache. Firefox's cache defaults<br>
to only a minute.<br>
<br>
Internet Explorer on the other hand can be a real pain. IE does not<br>
respect the DNS TTL, and I haven't figured out what exactly it's<br>
default timeout is (if one even exists). The only thing I can say for<br>
sure is that IE's DNS cache expires when IE is closed. I have a user<br>
who goes for weeks without rebooting her laptop (some users should not<br>
be able to use suspend/hibernate....) and based on that, IE's default<br>
DNS cache is at least multiple hours if it expires at all.<br>
<br>
You didn't mention what kind of application you're trying to support,<br>
but if it's a web application and your clients are using IE, things<br>
are not going to work as you expect without some tweaks to IE. Google<br>
for IE dns cache to find the registry changes needed, or figure out<br>
how to get your users to restart IE when a DNS change happens.<br>
<font color="#888888"><br>
--<br>
Andrew S. Zbikowski | <a href="http://andy.zibnet.us" target="_blank">http://andy.zibnet.us</a><br>
IT Outhouse Blog Thing | <a href="http://www.itouthouse.com" target="_blank">http://www.itouthouse.com</a><br>
</font><div><div></div><div class="Wj3C7c"><br>
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</div></div></blockquote></div><br><br clear="all"><br>-- <br>Donovan Niesen