[31351] in North American Network Operators' Group
RE: DNS Updates
daemon@ATHENA.MIT.EDU (Karyn Ulriksen)
Wed Sep 20 19:19:12 2000
Message-ID: <0127E258EE29D3118A0F00609765B44847CC3D@dhcp-gateway.sitestream.net>
From: Karyn Ulriksen <kulriksen@publichost.com>
To: 'Benjamin Harper' <harperb@hotmail.com>, nanog@merit.edu
Date: Wed, 20 Sep 2000 16:17:12 -0700
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Ben,
There is no major list for when DNS servers update. Basically, it works
like this....
Part of your DNS records has information on how long to store
information on a DNS server once it is gathered. The remote DNS server (ie,
Earthlink's) takes the information as a "recommendation". Most DNS servers
will go by this recommendation. However, there are quite a few DNS servers
out there that will ignore the recommendation. Generally, the servers that
disregard the recommended time will update with new information only after a
time configured by their administrator. In most cases, this will be about
24-48 hours. However, some ISPs may lengthen these times for whatever
reason or possibly due to misconfiguration.
If you are not seeing updates as quickly as you'd like, have your ISP
set the information in the SOA portion of your DNS record to be short lived.
If the current information is set to 30 days, some DNS servers may not see
your new information until after 30 days and there may be little you can do
about the current state. Ask your current DNS provider to set your TTLs for
your domain to 24-48 hours to alleviate this type of problem in the future.
If they don't know how to do this, you may want to arrange for a new DNS
provider.
---------------------------------------------------------------------
Best regards,
Karyn Ulriksen
Director of Network Operations
PublicHost, A SiteStream Company
22 Mauchly, Suite 200
Irvine, California 92618 USA
Phone: (949) 743-2000
email: kulriksen@publichost.com
URL: http://www.publichost.com <http://www.publichost.com/>
===========================================
-----Original Message-----
From: Benjamin Harper [mailto:harperb@hotmail.com]
Sent: Wednesday, September 20, 2000 3:06 PM
To: nanog@merit.edu
Subject: DNS Updates
Hi Everyone,
I was wondering if anybody knew when most DNS servers update their records
with regard to changes in DNS hosts for a domain. I've made changes to my
domain, and it looks like only a handful of DNS servers (earthlink being one
of them that I could find) have actually made the changes. I've heard that
the turnaround time is normally 24-48 hours for the changes to take effect,
yet it seems that it takes FOREVER for anything to ever happen when I have
NSI update the records for the site. Is there a reference on the net
somewhere containing when some of the major DNS servers update their
records, or does anybody have any idea why it always takes so long?
Many Thanks,
Ben
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<DIV><FONT color=#0000ff face=Arial size=2><SPAN
class=110020823-20092000>Ben,</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN
class=110020823-20092000></SPAN></FONT> </DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN
class=110020823-20092000> There is no major list for when DNS
servers update. Basically, it works like this....</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN
class=110020823-20092000></SPAN></FONT> </DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN
class=110020823-20092000> Part of your DNS records has
information on how long to store information on a DNS server once it is
gathered. The remote DNS server (ie, Earthlink's) takes the information as
a "recommendation". Most DNS servers will go by this recommendation.
However, there are quite a few DNS servers out there that will ignore the
recommendation. Generally, the servers that disregard the recommended time
will update with new information only after a time configured by their
administrator. In most cases, this will be about 24-48 hours.
However, some ISPs may lengthen these times for whatever reason or possibly due
to misconfiguration.</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN
class=110020823-20092000></SPAN></FONT> </DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN
class=110020823-20092000> If you are not seeing updates as
quickly as you'd like, have your ISP set the information in the SOA portion of
your DNS record to be short lived. If the current information is set to 30
days, some DNS servers may not see your new information until after 30 days and
there may be little you can do about the current state. Ask
your current DNS provider to set your TTLs for your domain to 24-48 hours
to alleviate this type of problem in the future. If they don't know how to
do this, you may want to arrange for a new DNS provider.</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN class=110020823-20092000>
<P><FONT
size=2>---------------------------------------------------------------------<BR>Best
regards,<BR><BR>Karyn Ulriksen<BR>Director of Network Operations<BR>PublicHost,
A SiteStream Company<BR>22 Mauchly, Suite 200<BR>Irvine, California
92618 USA<BR>Phone: (949) 743-2000<BR>email:
kulriksen@publichost.com<BR>URL: <A href="http://www.publichost.com/"
target=_blank>http://www.publichost.com</A><BR>===========================================<BR><BR><BR></FONT></P></SPAN></FONT></DIV>
<BLOCKQUOTE
style="BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px">
<DIV align=left class=OutlookMessageHeader dir=ltr><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B> Benjamin Harper
[mailto:harperb@hotmail.com]<BR><B>Sent:</B> Wednesday, September 20, 2000
3:06 PM<BR><B>To:</B> nanog@merit.edu<BR><B>Subject:</B> DNS
Updates<BR><BR></DIV></FONT>
<DIV>
<DIV><FONT face=Arial size=2>Hi Everyone,</FONT></DIV>
<DIV><FONT face=Arial size=2>I was wondering if anybody knew when most DNS
servers update their records with regard to changes in DNS hosts for a
domain. I've made changes to my domain, and it looks like only a handful
of DNS servers (earthlink being one of them that I could find) have actually
made the changes. I've heard that the turnaround time is normally 24-48
hours for the changes to take effect, yet it seems that it takes FOREVER for
anything to ever happen when I have NSI update the records for the site.
Is there a reference on the net somewhere containing when some of the major
DNS servers update their records, or does anybody have any idea why it always
takes so long? </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Many Thanks,</FONT></DIV>
<DIV><FONT face=Arial size=2>Ben</FONT></DIV></DIV></BLOCKQUOTE></BODY></HTML>
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