Re: What is a caching name server?
On Thu, May 19, 2005 at 10:15:41PM -0700, [EMAIL PROTECTED] 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: [EMAIL PROTECTED]
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?
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 [EMAIL PROTECTED] 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 ** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote confirms that this email message has been swept for the presence of computer viruses and is believed to be clean. **
Re: What is a caching name server?
On 2005-05-19 22:15:41 -0700, [EMAIL PROTECTED] 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?
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. 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). Really? 1) why would Bind NOT cache domain lookups for domains that are not listed in your local zone files? that seems rediculous. is there any way to host your company's domains in a Bind instance that also caches lookups? 2) is there a way to test a Bind server to make sure it is in fact caching its lookups? __ Do you Yahoo!? Yahoo! Small Business - Try our new resources site! http://smallbusiness.yahoo.com/resources/
Re: What is a caching name server?
email builder 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 greatly appreciated. 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). Really? 1) why would Bind NOT cache domain lookups for domains that are not listed in your local zone files? that seems rediculous. is there any way to host your company's domains in a Bind instance that also caches lookups? It will be a caching-only server if you don't have any local zone files. It will be both a caching server and a dns server once you add zones. 2) is there a way to test a Bind server to make sure it is in fact caching its lookups? __ Do you Yahoo!? Yahoo! Small Business - Try our new resources site! http://smallbusiness.yahoo.com/resources/ -- Roman Volf Keystreams Internet Solutions [EMAIL PROTECTED]
Re: What is a caching name server?
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?
On 5/20/2005 11:52 AM +0200, [EMAIL PROTECTED] 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?
http://cr.yp.to/djbdns.html simple, small, fast. -- Mirko Steiner Gesotec Soft- und Hardware GmbH Hilpertstr. 35 D-64295 Darmstadt Tel: +49 (6151) 66 777 50 Fax: +49 (6151) 66 777 59 http://www.gesotec.de
Re: What is a caching name server?
On Friday 20 May 2005 01:15, [EMAIL PROTECTED] 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?
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, [EMAIL PROTECTED] 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?
2) is there a way to test a Bind server to make sure it is in fact caching its lookups? dig(1) - Linux man page ... dig (domain information groper) is a flexible tool for interrogating DNS name servers. http://www.die.net/doc/linux/man/man1/dig.1.html
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
