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Old 01-03-2008, 11:01 PM
"Ashley M. Kirchner"
 
Default DNS question

We used to have a client that we hosted their domains on our DNS.
They have moved to a different host a while ago - like months ago. Now
suddenly, in the past 48 hours, I'm seeing a bunch of these in my logs:



named[1920]: client 216.199.46.11#58010: query (cache)
'travelhacker.com/A/IN' denied
named[1920]: client 70.46.90.166#1064: query (cache)
'travelhacker.com/A/IN' denied
named[1920]: client 208.109.78.200#31909: query (cache)
'travelhacker.com/MX/IN' denied
named[1920]: client 38.102.229.30#32772: query (cache)
'travelhacker.com/MX/IN' denied
named[1920]: client 208.53.147.132#41941: query (cache)
'travelhacker.com/CNAME/IN' denied
named[1920]: client 70.46.90.166#1064: query (cache)
'travelhacker.com/MX/IN' denied


I have bind setup to deny recursive lookups, and it's doing what
it's supposed to do there. However, is there any harm being done here?
Should I be looking into some way to have this stopped somehow?


--
W | It's not a bug - it's an undocumented feature.
+--------------------------------------------------------------------
Ashley M. Kirchner <mailto:ashley@pcraft.com> . 303.442.6410 x130
IT Director / SysAdmin / Websmith . 800.441.3873 x130
Photo Craft Imaging . 3550 Arapahoe Ave. #6
http://www.pcraft.com ..... . . . Boulder, CO 80303, U.S.A.


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Old 01-06-2008, 01:22 PM
John Cornelius
 
Default DNS question

Ashley M. Kirchner wrote:


We used to have a client that we hosted their domains on our DNS.
They have moved to a different host a while ago - like months ago.
Now suddenly, in the past 48 hours, I'm seeing a bunch of these in my
logs:



named[1920]: client 216.199.46.11#58010: query (cache)
'travelhacker.com/A/IN' denied
named[1920]: client 70.46.90.166#1064: query (cache)
'travelhacker.com/A/IN' denied
named[1920]: client 208.109.78.200#31909: query (cache)
'travelhacker.com/MX/IN' denied
named[1920]: client 38.102.229.30#32772: query (cache)
'travelhacker.com/MX/IN' denied
named[1920]: client 208.53.147.132#41941: query (cache)
'travelhacker.com/CNAME/IN' denied
named[1920]: client 70.46.90.166#1064: query (cache)
'travelhacker.com/MX/IN' denied


I have bind setup to deny recursive lookups, and it's doing what
it's supposed to do there. However, is there any harm being done
here? Should I be looking into some way to have this stopped somehow?


You may have still been listed as a name service in the root servers for
some reason or someone is using an out of date cached version of their
information. That's their problem, not yours and it probably isn't going
to do anything except suck up bandwidth.


If it isn't happening too often I wouldn't worry about it since it
should correct itself eventually.


--jc

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Old 03-22-2011, 12:13 PM
ann kok
 
Default dns question

Hi all

How can I know the refresh rate of the dns server?

Thank you


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Old 03-22-2011, 12:16 PM
 
Default dns question

What do you mean by refresh rate of the dns server? Like TTL length of records? Or..?

Aly

------Original Message------
From: ann kok
Sender: centos-bounces@centos.org
To: centos@centos.org
ReplyTo: CentOS mailing list
Subject: [CentOS] dns question
Sent: Mar 22, 2011 9:13 AM

Hi all

How can I know the refresh rate of the dns server?

Thank you


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Sent from my BlackBerry device on the Rogers Wireless Network
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Old 03-22-2011, 01:30 PM
Devin Reade
 
Default dns question

As was previously mentioned, you need to be more clear about what
you're asking. There are multiple related concepts. Look up a
description of the SOA record, in particular the refresh, retry,
expire, and minimum TTL fields. The first three affect how DNS
secondary servers behave. The last can affect client responses,
but you can also have per-record TTL values and zone default TTL
values.

This link might be a good starting point for understanding the
SOA parameters: <http://rscott.org/dns/soa.html>

If you're trying to solve a problem with DNS secondaries keeping
up, watch that you're incrementing the serial number. If you're
using split zones (views) or other esoteric configurations, things
get a whole lot more complicated.
--
Everyone has a photographic memory. Some don't have film.
- Steven Wright

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Old 03-22-2011, 02:29 PM
John R Pierce
 
Default dns question

On 03/22/11 6:13 AM, ann kok wrote:
> Hi all
>
> How can I know the refresh rate of the dns server?

http://oreilly.com/catalog/9780596001582
http://www.isc.org/software/bind/documentation


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Old 03-22-2011, 02:33 PM
Luigi Rosa
 
Default dns question

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

ann kok said the following on 22/03/11 14:13:

> How can I know the refresh rate of the dns server?


$ dig www.google.com

...
;; ANSWER SECTION:
www.google.com. 515949 IN CNAME www.l.google.com.
www.l.google.com. 300 IN A 74.125.39.106
www.l.google.com. 300 IN A 74.125.39.147
www.l.google.com. 300 IN A 74.125.39.99
www.l.google.com. 300 IN A 74.125.39.103
www.l.google.com. 300 IN A 74.125.39.104
www.l.google.com. 300 IN A 74.125.39.105

The second column is the TTL




Ciao,
luigi

- --
/
+--[Luigi Rosa]--


Le macchine volanti diventeranno certo piu` veloci in futuro;
questo le rendera` interessanti per attivita` sportive,
ma e` escluso che possano mai avere applicazioni commerciali.
--Octave Chanute, pioniere dell'aviazione 1910
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Version: GnuPG v1.4.10 (GNU/Linux)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/

iEYEARECAAYFAk2IwUwACgkQ3kWu7Tfl6ZTgQQCgnJn/UqqlfW5cxmChmf7etXs8
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