Barry, If the dig ends with @128.97.94.1, the reply is authoritative. Later, Ken
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Thursday, October 30, 2008 5:07 PM To: bind-users@isc.org Subject: Re: DNS "chicken-and-egg" Problem To summarize this problem - 1) One of my mailers is trying to find the "A" record for igpp.ucla.edu so that it can verify that mail from that domain is legitimate mail. 2) The ucla.edu name servers delegate the zone to a name server igpp.ucla.edu I talked with a DNS admin at UCLA, and he told me that they have in the ucla.edu zone a delegation and glue: igpp.ucla.edu. 6H IN NS igpp.ucla.edu igpp.ucla.edu. 6H IN A 128.97.94.1 3) When I query the four ucla.edu name servers, dig returns: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 4 ;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1 ;; QUERY SECTION: ;; igpp.ucla.edu, type = A, class = IN ;; AUTHORITY SECTION: igpp.ucla.edu. 6H IN NS igpp.ucla.edu. ;; ADDITIONAL SECTION: igpp.ucla.edu. 6H IN A 128.97.94.1 4) Why is this information not in the cache on my server? Jinmei Tatuya said it might be due to a cache-clearing bug in 9.5.0 (I am running 9.5.0-P2). I ran a test with "max-cache-size 256M", and I did not see the record cached. And I doubt that the cache was full. 5) Someone (I do not remember who, and I cannot find the reply in the list archives) pointed out to me that the answers I am getting from UCLA are not authoritative - the "aa" flag is missing. What could cause glue information (that I think is correct) in the ucla.edu zones to be returned to my server as not authoritative? I now assume that the reason that my BIND does not cache the glue is that the glue is not marked authoritative. Thanks. ---------------------------------------------------------------------- Barry S. Finkel Computing and Information Systems Division Argonne National Laboratory Phone: +1 (630) 252-7277 9700 South Cass Avenue Facsimile:+1 (630) 252-4601 Building 222, Room D209 Internet: [EMAIL PROTECTED] Argonne, IL 60439-4828 IBMMAIL: I1004994
