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<div class="moz-cite-prefix">There's no way within the DNS protocol
itself to reach out and tell a nameserver to purge an entry in its
cache that hasn't expired yet.<br>
<br>
There are "out of band" ways: e.g. restart, recycle, rndc
commands, etc. All of those require admin access to the nameserver
instances in question. But nothing within the DNS protocol itself
allows one to do this.<br>
<br>
That's why everyone is saying you need to reduce the TTL value
*before* you make a change, if you want that change to be visible
quickly.<br>
<br>
- Kevin<br>
<br>
On 10/15/2013 10:53 AM, babu dheen wrote:<br>
</div>
<blockquote
cite="mid:1381848793.10395.YahooMailNeo@web190804.mail.sg3.yahoo.com"
type="cite">
<div style="color:#000; background-color:#fff; font-family:times
new roman, new york, times, serif;font-size:12pt">
<div><span>Hi Matus,</span></div>
<div><span></span> </div>
<span>
<div><em>"The standard way to handle this situation is, when
you know you are going to<br clear="none">
make a change, to lower TTL of a particular RR to a small
value (e.g. 300)<br clear="none">
and after change to restore the TTL to sane standard value
(e.g. 43200)."</em></div>
<div><em></em> </div>
<div><em>I just need clarification on your above update.</em></div>
<div><em></em> </div>
<div><em> If I change the TTL value on the particular zone
after modifying a record in Redhat Linux BIND Caching DNS
server, My Redhat bind Caching DNS server cache would be
refreshed after 300 seconds but what if my backend
windows DNS server is still responding to end user old
record from from its cache?</em></div>
<div><em></em> </div>
<div><em></em> </div>
<div><em>So my backend windows DNS server can get the newly
modified record from DNS only when its contacting Redhat
DNS server for the newly added date once Windows DNS cache
is refreshed?</em></div>
<div><em></em> </div>
<div><em>Regards</em></div>
<div><em>Babu</em></div>
<div><em></em> </div>
</span>
<div class="yahoo_quoted" style="display: block;"> <br>
<br>
<div style="font-family: times new roman, new york, times,
serif; font-size: 12pt;">
<div style="font-family: times new roman, new york, times,
serif; font-size: 12pt;">
<div dir="ltr"> <font size="2" face="Arial"> On Tuesday,
15 October 2013 3:04 PM, Matus UHLAR - fantomas
<a class="moz-txt-link-rfc2396E" href="mailto:uhlar@fantomas.sk"><uhlar@fantomas.sk></a> wrote:<br>
</font> </div>
<div class="y_msg_container">On 15.10.13 19:38, babu dheen
wrote:<br clear="none">
> I am running BIND caching DNS server in Redhat
Linux. This DNS server is<br clear="none">
>used as name server for other DNS servers which are
running in Windows<br clear="none">
>2003. Whenever I modify a existing record in BIND
DNS caching server zone,<br clear="none">
>its not immediately taking affect in my Windows DNS
servers. But if I<br clear="none">
>clear the Windows DNS server DNS cache, its taking
affect.<br clear="none">
<br clear="none">
> Is it possible to enforce/refresh cache of other
DNS server through BIND<br clear="none">
> DNS server once modification is done in zone file?<br
clear="none">
<br clear="none">
No. Only server admins can maintain caches.<br
clear="none">
<br clear="none">
Your job is to set TTL high enough not to cause you big
load and not to time<br clear="none">
out when your servers fail, but low enough to refresah
when needed.<br clear="none">
<br clear="none">
The standard way to handle this situation is, when you
know you are going to<br clear="none">
make a change, to lower TTL of a particular RR to a
small value (e.g. 300)<br clear="none">
and after change to restore the TTL to sane standard
value (e.g. 43200).<br clear="none">
<br clear="none">
You may ask for access to win2003 servers to manipulate
their caches, or<br clear="none">
configure your zone as slave on them and send notifies
to them, so they<br clear="none">
notice as soon as possible.<br clear="none">
<br clear="none">
-- <br clear="none">
Matus UHLAR - fantomas, <a moz-do-not-send="true"
href="" shape="rect"
ymailto="mailto:uhlar@fantomas.sk">uhlar@fantomas.sk</a>
; <a moz-do-not-send="true" href="" target="_blank"
shape="rect">http://www.fantomas.sk/</a><br
clear="none">
Warning: I wish NOT to receive e-mail advertising to
this address.<br clear="none">
Varovanie: na tuto adresu chcem NEDOSTAVAT akukolvek
reklamnu postu.<br clear="none">
2B|!2B, that's a question!
<div class="yqt9641222591" id="yqtfd90835"><br
clear="none">
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