On Sun, Jul 6, 2014 at 3:45 PM, Mohamed Lrhazi <ml...@georgetown.edu> wrote: > Thanks Lyle, I did not mean to say that list was defunct, quite the > opposite, I felt that I was a bit spamming it with non global operational > DNS issue....
Nah. No worries. This list traditionally has a wide range of topics. Your mail was polite and sane, and you seem interested in learning. Entirely appropriate (IMO) for this list. W > > Yes, I did not debug well, went for the quick fix of clearing the cache.... > That being said, end users query for the name and the IPs, always... but > then here they were only getting the CNAME... so am trying to figure out in > what circumstances would that occur... Would a recursive resolver that has > the CNAME in cache, but the A records expired, fail to resolve the A > records, return just the CNAME? > > Thanks a lot, > Mohamed. > > > On Sun, Jul 6, 2014 at 3:13 PM, Lyle Giese <l...@lcrcomputer.net> wrote: >> >> You waited less than an hour before proclaiming the list defunct? It's >> Sunday in most of the world. Most of us are doing other things than sitting >> on this list. >> >> That said, my initial thought is that your server answered your question. >> Nothing more. Did you ask it for the A record for googlemail.l.google.com ? >> That might have told you more. >> >> Lyle Giese >> LCR Computer Services, Inc. >> >> >> On 07/06/14 13:38, Mohamed Lrhazi wrote: >> >> I am thinking this list is not appropriate for some of my questions... >> Could someone suggest a better one, maybe as active and rich, as this one, >> but more appropriate for general DNS discussions? >> >> Thanks a lot, >> Mohamed. >> >> >> On Sun, Jul 6, 2014 at 2:02 PM, Mohamed Lrhazi <ml...@georgetown.edu> >> wrote: >>> >>> We had a little mail outage which turned out to be caused by one of our >>> caching DNS servers returning the bellow incomplete reply. >>> >>> Clearing the cache on the problematic server fixed the issue.... >>> >>> Am thinking it is now impossible for me to find the root cause in this >>> instance... but wondering if you guys could hint at what could cause such a >>> problem... bugs in the DNS servers involved? temporary misconfig at Google's >>> servers? network issue? >>> >>> The setup is a bit convoluted: >>> >>> cache server --> resolver cache server --> Internet >>> >>> The fix was clearing at the first server. so I am guessing at some point >>> the resolver gave the incomplete answer. >>> >>> Thanks a lot, >>> Mohamed. >>> >>> ➜ ~ dig mail.google.com @141.161.100.201 >>> >>> ; <<>> DiG 9.9.5-3-Ubuntu <<>> mail.google.com @141.161.100.201 >>> ;; global options: +cmd >>> ;; Got answer: >>> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 20414 >>> ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 4, ADDITIONAL: 5 >>> >>> ;; OPT PSEUDOSECTION: >>> ; EDNS: version: 0, flags:; udp: 4096 >>> ;; QUESTION SECTION: >>> ;mail.google.com. IN A >>> >>> ;; ANSWER SECTION: >>> mail.google.com. 10213 IN CNAME googlemail.l.google.com. >>> >>> ;; AUTHORITY SECTION: >>> google.com. 96485 IN NS ns2.google.com. >>> google.com. 96485 IN NS ns3.google.com. >>> google.com. 96485 IN NS ns4.google.com. >>> google.com. 96485 IN NS ns1.google.com. >>> >>> ;; ADDITIONAL SECTION: >>> ns3.google.com. 108462 IN A 216.239.36.10 >>> ns4.google.com. 108462 IN A 216.239.38.10 >>> ns1.google.com. 108462 IN A 216.239.32.10 >>> ns2.google.com. 108462 IN A 216.239.34.10 >>> >>> ;; Query time: 22 msec >>> ;; SERVER: 141.161.100.201#53(141.161.100.201) >>> ;; WHEN: Sun Jul 06 12:42:09 EDT 2014 >>> ;; MSG SIZE rcvd: 207 >>> >>> >> >> >> >> _______________________________________________ >> dns-operations mailing list >> dns-operations@lists.dns-oarc.net >> https://lists.dns-oarc.net/mailman/listinfo/dns-operations >> dns-jobs mailing list >> https://lists.dns-oarc.net/mailman/listinfo/dns-jobs >> >> >> >> _______________________________________________ >> dns-operations mailing list >> dns-operations@lists.dns-oarc.net >> https://lists.dns-oarc.net/mailman/listinfo/dns-operations >> dns-jobs mailing list >> https://lists.dns-oarc.net/mailman/listinfo/dns-jobs > > > > _______________________________________________ > dns-operations mailing list > dns-operations@lists.dns-oarc.net > https://lists.dns-oarc.net/mailman/listinfo/dns-operations > dns-jobs mailing list > https://lists.dns-oarc.net/mailman/listinfo/dns-jobs _______________________________________________ dns-operations mailing list dns-operations@lists.dns-oarc.net https://lists.dns-oarc.net/mailman/listinfo/dns-operations dns-jobs mailing list https://lists.dns-oarc.net/mailman/listinfo/dns-jobs
