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Lee Parmeter

2005-May-17 14:28 UTC

[CentOS] cashing named server

I started the named server on CentOS and it seems to
resolve DNS request OK, but it does not seem to retain the
info for very long. From what I can tell using "dig", a
domain's ip address is retained for less than 12 hours. So
in the morning, it takes 4+ seconds to resolve again the
first time. Is there an adjustment somewhere for this or is
the caching named support not enabled by default? 

Also, I thought it would be faster if I set named to use my
ISP's named server as the first choice. Where do I set this
up, in root.hints?

Anyone who knows more about "named" please feel free to
comment!

Thanks!
Lee

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Marco Garza

2005-May-17 14:35 UTC

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[CentOS] cashing named server

I think this is the manual you are looking for.

http://www.redhat.com/docs/manuals/enterprise/RHEL-4-Manual/ref-guide/ch-bind.html

-Marco Garza



----- Original Message ----- 
From: "Lee Parmeter" <leejpar at yahoo.com>
To: <centos at centos.org>
Sent: Tuesday, May 17, 2005 9:28 AM
Subject: [CentOS] cashing named server

>I started the named server on CentOS and it seems to
> resolve DNS request OK, but it does not seem to retain the
> info for very long. From what I can tell using "dig", a
> domain's ip address is retained for less than 12 hours. So
> in the morning, it takes 4+ seconds to resolve again the
> first time. Is there an adjustment somewhere for this or is
> the caching named support not enabled by default?
>
> Also, I thought it would be faster if I set named to use my
> ISP's named server as the first choice. Where do I set this
> up, in root.hints?
>
> Anyone who knows more about "named" please feel free to
> comment!
>
> Thanks!
> Lee
>
> __________________________________________________
> Do You Yahoo!?
> Tired of spam?  Yahoo! Mail has the best spam protection around
> http://mail.yahoo.com
> _______________________________________________
> CentOS mailing list
> CentOS at centos.org
> http://lists.centos.org/mailman/listinfo/centos
>

Johnny Hughes

2005-May-17 14:37 UTC

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[CentOS] cashing named server

On Tue, 2005-05-17 at 07:28 -0700, Lee Parmeter wrote: > I started the named server on CentOS and it seems to
> resolve DNS request OK, but it does not seem to retain the
> info for very long. From what I can tell using "dig", a
> domain's ip address is retained for less than 12 hours. So
> in the morning, it takes 4+ seconds to resolve again the
> first time. Is there an adjustment somewhere for this or is
> the caching named support not enabled by default? 
> 
> Also, I thought it would be faster if I set named to use my
> ISP's named server as the first choice. Where do I set this
> up, in root.hints?
> 
> Anyone who knows more about "named" please feel free to
> comment!
> 
> Thanks!
> Lee
> 
The owner of the domain controls how long DNS entries are cached.  If
you do a dig, one of the things you get from an authorized DNS server
for that domain is the TTL (time-to-live).  That is how many seconds
your entry will remained cached in a non-authoritative DNS server.

for example:
-------------------------------------------------------------------
dig www.yahoo.com

; <<>> DiG 9.2.4 <<>> www.yahoo.com
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 2270
;; flags: qr rd ra; QUERY: 1, ANSWER: 9, AUTHORITY: 10, ADDITIONAL: 2

;; QUESTION SECTION:
;www.yahoo.com.                 IN      A

;; ANSWER SECTION:
www.yahoo.com.          300     IN      CNAME   www.yahoo.akadns.net.
www.yahoo.akadns.net.   60      IN      A       68.142.197.89
www.yahoo.akadns.net.   60      IN      A       68.142.197.90
www.yahoo.akadns.net.   60      IN      A       68.142.197.73
www.yahoo.akadns.net.   60      IN      A       68.142.197.75
www.yahoo.akadns.net.   60      IN      A       68.142.197.76
www.yahoo.akadns.net.   60      IN      A       68.142.197.80
www.yahoo.akadns.net.   60      IN      A       68.142.197.83
www.yahoo.akadns.net.   60      IN      A       68.142.197.88

;; AUTHORITY SECTION:
akadns.net.             127047  IN      NS      asia5.akadns.net.
akadns.net.             127047  IN      NS      asia9.akadns.net.
akadns.net.             127047  IN      NS      eur10.akadns.net.
akadns.net.             127047  IN      NS      za.akadns.org.
akadns.net.             127047  IN      NS      zh.akadns.org.
akadns.net.             127047  IN      NS      eur3.akadns.net.
akadns.net.             127047  IN      NS      use1.akadns.net.
akadns.net.             127047  IN      NS      use9.akadns.net.
akadns.net.             127047  IN      NS      usw6.akadns.net.
akadns.net.             127047  IN      NS      usw7.akadns.net.

;; ADDITIONAL SECTION:
za.akadns.org.          526     IN      A       208.185.132.176
zh.akadns.org.          526     IN      A       63.208.48.46

;; Query time: 164 msec
;; SERVER: 192.168.0.2#53(192.168.0.2)
;; WHEN: Tue May 17 09:35:27 2005
;; MSG SIZE  rcvd: 424
---------------------------------------------------------------

So that will remain in cache another 127047 seconds :)
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Johnny Hughes

2005-May-17 14:41 UTC

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[CentOS] cashing named server

On Tue, 2005-05-17 at 07:28 -0700, Lee Parmeter wrote:

> it takes 4+ seconds to resolve again the
> first time.
to solve this issue ... if you are not using ipv6, turn it off like
this:

   alias net-pf-10 off

to your /etc/modprobe.conf and reboot the server

(originally posted by Troy Engel :)



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