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
