Query CNAME failed
Wilfred Sarmiento
wpsarmiento at globe.com.ph
Wed Jul 3 08:33:47 UTC 2019
Hi Mark,
It also happen to all domain record with a CNAME on external domain. It
doesn't only happen in cebupacificair.com domain.
Also, i notice the issue happens after an hour of server reboot. From the
1st hour after reboot, the issue didn't happen. So i am thinking this might
be a session limit?
Wil
On Wed, Jul 3, 2019 at 4:19 PM Mark Andrews <marka at isc.org> wrote:
> Try just diagnosing why the lookup of book.cebupacair.cust.lldns.net
> and/or cebupacair-dd.lldns.net is failing which are the target in the
> CNAME chain. You know the lookup of book.cebupacificair.com returns a
> CNAME record so the next step to a lookup of book.cebupacificair.com and
> book.cebupacificair.com/CNAME.
>
> ; <<>> DiG 9.15.1 <<>> book.cebupacair.cust.lldns.net
> ;; global options: +cmd
> ;; Got answer:
> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 5908
> ;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 1
>
> ;; OPT PSEUDOSECTION:
> ; EDNS: version: 0, flags:; udp: 4096
> ; COOKIE: cbdd8bcfcc962e6a9e1b6a5e5d1c63554cdb8ed4c7c121da (good)
> ;; QUESTION SECTION:
> ;book.cebupacair.cust.lldns.net. IN A
>
> ;; ANSWER SECTION:
> book.cebupacair.cust.lldns.net. 300 IN CNAME cebupacair-dd.lldns.net.
> cebupacair-dd.lldns.net. 60 IN A 68.142.70.27
> cebupacair-dd.lldns.net. 60 IN A 68.142.68.27
>
> Mark
>
> > On 3 Jul 2019, at 5:48 pm, Wilfred Sarmiento via bind-users <
> bind-users at lists.isc.org> wrote:
> >
> > Hi Bind Users,
> >
> > Currently drained my brain troubleshooting where could be the cause of
> my issue on one of our Authoritative DNS server.
> > When querying a CNAME directly to the server, where a CNAME is pointed
> to an external domain, results failed with timeout error and no server
> could be reached.
> >
> > ; <<>> DiG 9.9.4-RedHat-9.9.4-38.el7_3.2 <<>> book.cebupacificair.com @
> dns1.globenet.com.ph
> > ;; global options: +cmd
> > ;; connection timed out; no servers could be reached
> >
> > Server logs produce 3 query log then show a query failed (timed out);
> >
> > client @0x7fd9ac0908d0 x.x.x.x#51579 (book.cebupacificair.com): query:
> book.cebupacificair.com IN A +E(0) (203.177.255.10)
> > client @0x7fd9a4484080 x.x.x.x#51579 (book.cebupacificair.com): query:
> book.cebupacificair.com IN A +E(0) (203.177.255.10)
> > client @0x7fd9a4481cb0 x.x.x.x#51579 (book.cebupacificair.com): query:
> book.cebupacificair.com IN A +E(0) (203.177.255.10)
> > client @0x7fd9ac0908d0 x.x.x.x#51579 (book.cebupacificair.com): query
> failed (timed out) for book.cebupacificair.com/IN/A at query.c:6786
> >
> > But when i send a query with +norecurse option, results is successful.
> >
> > dig +norecurse book.cebupacificair.com @dns1.globenet.com.ph
> >
> > ; <<>> DiG 9.9.4-RedHat-9.9.4-38.el7_3.2 <<>> +norecurse
> book.cebupacificair.com @dns1.globenet.com.ph
> > ;; global options: +cmd
> > ;; Got answer:
> > ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 19755
> > ;; flags: qr aa ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 5
> >
> > ;; OPT PSEUDOSECTION:
> > ; EDNS: version: 0, flags:; udp: 4096
> > ;; QUESTION SECTION:
> > ;book.cebupacificair.com. IN A
> >
> > ;; ANSWER SECTION:
> > book.cebupacificair.com. 1200 IN CNAME
> book.cebupacair.cust.lldns.net.
> >
> > ;; AUTHORITY SECTION:
> > lldns.net. 171335 IN NS ns1.lldns.net.
> > lldns.net. 171335 IN NS ns2.lldns.net.
> >
> > ;; ADDITIONAL SECTION:
> > ns1.lldns.net. 149880 IN A 208.111.184.11
> > ns2.lldns.net. 93416 IN A 208.111.184.12
> > ns1.lldns.net. 93416 IN AAAA 2607:f4e8:ac:1::11
> > ns2.lldns.net. 93416 IN AAAA 2607:f4e8:ac:1::12
> >
> > ;; Query time: 1 msec
> > ;; SERVER: 203.177.255.10#53(203.177.255.10)
> > ;; WHEN: Wed Jul 03 03:36:21 EDT 2019
> > ;; MSG SIZE rcvd: 229
> >
> > This is the named.conf options;
> >
> > options {
> > directory "/var/namedb";
> > version "Query Not Allowed.";
> > allow-recursion { globenet; };
> > recursive-clients 1000000;
> > allow-query-cache { globenet; };
> > allow-query { any; };
> > tcp-clients 5000;
> >
> > blackhole { bogusnet; };
> >
> > pid-file "/var/local/bind/var/run/named.pid";
> > zone-statistics yes;
> > statistics-file "/var/namedb/named.stats";
> > };
> >
> > Bind version is 9.14.2
> >
> > The "globenet" group are the list of IPs we allowed for recursion. And
> this issue happens only on the CNAME record with external domain.
> >
> > Thank you in advance.
> >
> > Regards,
> > Wil Sarmiento
> >
> >
> >
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> --
> Mark Andrews, ISC
> 1 Seymour St., Dundas Valley, NSW 2117, Australia
> PHONE: +61 2 9871 4742 INTERNET: marka at isc.org
>
>
--
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