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Posted to users@spamassassin.apache.org by li...@zeta.net on 2005/05/20 07:15:41 UTC
What is a caching name server?
Hello list,
in several posts I have noticed people refer to a "caching nameserver".
What exactly is that? Would BIND 9.3.1 qualify? Any advice would be
greatly appreciated.
Regards,
Devin
Re: What is a caching name server?
Posted by Martin Hepworth <ma...@solid-state-logic.com>.
Hi
yes Bind will become a caching only name server if you don;t have any
local zone files to lookup. Basically think of it as a proxy with
memory. It will remember previous look ups so it won't ask it's
resolvers again (unless the timeout value on the record has been reached).
--
Martin Hepworth
Snr Systems Administrator
Solid State Logic
Tel: +44 (0)1865 842300
lists@zeta.net wrote:
> Hello list,
>
> in several posts I have noticed people refer to a "caching nameserver".
> What exactly is that? Would BIND 9.3.1 qualify? Any advice would be
> greatly appreciated.
>
> Regards,
> Devin
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Re: What is a caching name server?
Posted by Martin Schröder <ma...@oneiros.de>.
On 2005-05-19 22:15:41 -0700, lists@zeta.net wrote:
> in several posts I have noticed people refer to a "caching nameserver".
> What exactly is that? Would BIND 9.3.1 qualify? Any advice would be
http://www.google.com/search?q=caching+nameserver
HTH. HAND.
--
http://www.tm.oneiros.de
Re: What is a caching name server?
Posted by Niek <ni...@asbak.coding-slaves.com>.
On 5/20/2005 11:52 AM +0200, lists@zeta.net wrote:
> Both of our mail servers are also DNS boxes with real zones. Is there
> any way
> for BIND to act both as a normal DNS server for domains and also a caching
> nameserver?
Yes, read the BIND documentation.
Niek
Re: What is a caching name server?
Posted by li...@zeta.net.
> > in several posts I have noticed people refer to a "caching nameserver".
>> What exactly is that?
>
>It's a nameserver without local zone information except for
>root-hints and, perhaps, localhost.
>
>> Would BIND 9.3.1 qualify?
>
>Yes.
Both of our mail servers are also DNS boxes with real zones. Is there any way
for BIND to act both as a normal DNS server for domains and also a caching
nameserver?
Regards,
Devin
Re: What is a caching name server?
Posted by Christian Recktenwald <sp...@citecs.de>.
On Thu, May 19, 2005 at 10:15:41PM -0700, lists@zeta.net wrote:
> Hello list,
>
> in several posts I have noticed people refer to a "caching nameserver".
> What exactly is that?
It's a nameserver without local zone information except for
root-hints and, perhaps, localhost.
> Would BIND 9.3.1 qualify?
Yes.
Most Linux distributions (if you're happen to use one) have a default
configuration for bind to run as caching nameserver.
Minimal bind config on a Debian system:
------------------------------
options {
directory "/var/cache/bind";
version "none of your business";
};
// prime the server with knowledge of the root servers
zone "." {
type hint;
file "/etc/bind/db.root";
};
// be authoritative for the localhost forward and reverse zones, and for
// broadcast zones as per RFC 1912
zone "localhost" {
type master;
file "/etc/bind/db.local";
};
zone "127.in-addr.arpa" {
type master;
file "/etc/bind/db.127";
};
zone "0.in-addr.arpa" {
type master;
file "/etc/bind/db.0";
};
zone "255.in-addr.arpa" {
type master;
file "/etc/bind/db.255";
};
------------------------------
HTH, Chris
--
Christian Recktenwald : :
citecs GmbH : spamassassin-talk-dist@citecs.de
Unternehmensberatung fuer : voice +49 711 601 2090 : Boeblinger Strasse 189
EDV und Telekommunikation : fax +49 711 601 2092 : D-70199 Stuttgart
Re: What is a caching name server?
Posted by David Birnbaum <da...@pins.net>.
nscd is a Solaris daemon (perhaps other OSs as well) that caches
gethostbynam()/gethostbyaddr() lookups (and others of that ilk), but not all of
the DNS lookups that SpamAssassin uses (I think SpamAssassin may specifically
bypass some of those by use Net::DNS directly instead of the built-in OS
resolver routines).
nscd is controlled by parameters in /etc/nscd.conf. You may see big performance
gains for IP and name lookup if you tune the negative caching paremters up on
busy mail servers, in any case.
David.
-----
On Fri, 20 May 2005, Gene Heskett wrote:
> On Friday 20 May 2005 01:15, lists@zeta.net wrote:
>> Hello list,
>>
>> in several posts I have noticed people refer to a "caching
>> nameserver". What exactly is that? Would BIND 9.3.1 qualify? Any
>> advice would be greatly appreciated.
>>
>> Regards,
>> Devin
>
> On my systems, there is an 'nscd'.
>
> Is this not a Name Service Caching Daemon? Docs seem to be sparse for
> it here though.
>
> --
> Cheers, Gene
> "There are four boxes to be used in defense of liberty:
> soap, ballot, jury, and ammo. Please use in that order."
> -Ed Howdershelt (Author)
> 99.34% setiathome rank, not too shabby for a WV hillbilly
> Yahoo.com and AOL/TW attorneys please note, additions to the above
> message by Gene Heskett are:
> Copyright 2005 by Maurice Eugene Heskett, all rights reserved.
>
Re: What is a caching name server?
Posted by Gene Heskett <ge...@verizon.net>.
On Friday 20 May 2005 01:15, lists@zeta.net wrote:
>Hello list,
>
>in several posts I have noticed people refer to a "caching
> nameserver". What exactly is that? Would BIND 9.3.1 qualify? Any
> advice would be greatly appreciated.
>
>Regards,
>Devin
On my systems, there is an 'nscd'.
Is this not a Name Service Caching Daemon? Docs seem to be sparse for
it here though.
--
Cheers, Gene
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
99.34% setiathome rank, not too shabby for a WV hillbilly
Yahoo.com and AOL/TW attorneys please note, additions to the above
message by Gene Heskett are:
Copyright 2005 by Maurice Eugene Heskett, all rights reserved.