I-D ACTION:draft-ietf-dnsind-ncache-04.txt

[[e-mail]]

 A Revised Internet-Draft is available from the on-line Internet-Drafts 
 directories. This draft is a work item of the DNS IXFR, Notification, and 
 Dynamic Update Working Group of the IETF.                                 

       Title     : Negative Caching of DNS Queries (DNS NCACHE)            
       Author(s) : M. Andrews
       Filename  : draft-ietf-dnsind-ncache-04.txt
       Pages     : 15
       Date      : 07/28/1997

[RFC1034] provided a description of how to cache negative responses. It 
however had a fundamental flaw in that it did not allow a name server to 
hand out those cached responses to other resolvers, thereby nullifying the 
effect of the caching. This document addresses issues raise in the light of
experience and replaces [RFC1034 Section 4.3.4].   
                    
Negative caching was an optional part of the DNS specification and deals 
with the caching of the non-existence of an RRset or domain name.  
        
Negative caching is useful as it reduces the response time for negative 
answers. It also reduces the number of messages that have to be sent 
between resolvers and name servers hence overall network traffic.  A large 
proportion of DNS traffic on the Internet could be eliminated if all 
resolvers implemented negative caching. With this in mind negative caching 
should no longer be seen as an optional part of a DNS resolver.            

Internet-Drafts are available by anonymous FTP.  Login with the username
"anonymous" and a password of your e-mail address.  After logging in,
type "cd internet-drafts" and then
     "get draft-ietf-dnsind-ncache-04.txt".
A URL for the Internet-Draft is:
ftp://ds.internic.net/internet-drafts/draft-ietf-dnsind-ncache-04.txt
 
Internet-Drafts directories are located at:	
	                                                
     o  Africa:  ftp.is.co.za                    
	                                                
     o  Europe:  ftp.nordu.net            	
                 ftp.nis.garr.it                 
	                                                
     o  Pacific Rim: munnari.oz.au               
	                                                
     o  US East Coast: ds.internic.net           
	                                                
     o  US West Coast: ftp.isi.edu               
	                                                
Internet-Drafts are also available by mail.	
	                                                
Send a message to:  [e-mail]. In the body type: 
     "FILE /internet-drafts/draft-ietf-dnsind-ncache-04.txt".
							
NOTE: The mail server at ds.internic.net can return the document in
      MIME-encoded form by using the "mpack" utility.  To use this
      feature, insert the command "ENCODING mime" before the "FILE"
      command.  To decode the response(s), you will need "munpack" or
      a MIME-compliant mail reader.  Different MIME-compliant mail readers
      exhibit different behavior, especially when dealing with
      "multipart" MIME messages (i.e., documents which have been split
      up into multiple messages), so check your local documentation on
      how to manipulate these messages.
							
							

Below is the data which will enable a MIME compliant mail reader 
implementation to automatically retrieve the ASCII version
of the Internet-Draft.

ftp://ds.internic.net/internet-drafts/draft-ietf-dnsind-ncache-04.txt"><ftp://ds.internic.net/internet-drafts/draft-ietf-dnsind-ncache-04.txt>