<div dir="ltr"><div dir="ltr"><div class="gmail_default" style="font-family:tahoma,sans-serif;font-size:small;color:#000000">Hi Mark,</div><div class="gmail_default" style="font-family:tahoma,sans-serif;font-size:small;color:#000000"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif;font-size:small;color:#000000">It also happen to all domain record with a CNAME on external domain. It doesn't only happen in <a href="http://cebupacificair.com">cebupacificair.com</a> domain. </div><div class="gmail_default" style="font-family:tahoma,sans-serif;font-size:small;color:#000000">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?</div><div class="gmail_default" style="font-family:tahoma,sans-serif;font-size:small;color:#000000"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif;font-size:small;color:#000000">Wil </div><br><input name="virtru-metadata" type="hidden" value="{"email-policy":{"state":"closed","expirationUnit":"days","disableCopyPaste":false,"disablePrint":false,"disableForwarding":false,"enableNoauth":false,"persistentProtection":false,"expandedWatermarking":false,"expires":false,"isManaged":false},"attachments":{},"compose-id":"12","compose-window":{"secure":false}}"></div><br><div class="gmail_quote" style=""><div dir="ltr" class="gmail_attr">On Wed, Jul 3, 2019 at 4:19 PM Mark Andrews <<a href="mailto:marka@isc.org">marka@isc.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Try just diagnosing why the lookup of <a href="http://book.cebupacair.cust.lldns.net" rel="noreferrer" target="_blank">book.cebupacair.cust.lldns.net</a> and/or <a href="http://cebupacair-dd.lldns.net" rel="noreferrer" target="_blank">cebupacair-dd.lldns.net</a> is failing which are the target in the CNAME chain. You know the lookup of <a href="http://book.cebupacificair.com" rel="noreferrer" target="_blank">book.cebupacificair.com</a> returns a CNAME record so the next step to a lookup of <a href="http://book.cebupacificair.com" rel="noreferrer" target="_blank">book.cebupacificair.com</a> and <a href="http://book.cebupacificair.com/CNAME" rel="noreferrer" target="_blank">book.cebupacificair.com/CNAME</a>.<br>
<br>
; <<>> DiG 9.15.1 <<>> <a href="http://book.cebupacair.cust.lldns.net" rel="noreferrer" target="_blank">book.cebupacair.cust.lldns.net</a><br>
;; global options: +cmd<br>
;; Got answer:<br>
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 5908<br>
;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 1<br>
<br>
;; OPT PSEUDOSECTION:<br>
; EDNS: version: 0, flags:; udp: 4096<br>
; COOKIE: cbdd8bcfcc962e6a9e1b6a5e5d1c63554cdb8ed4c7c121da (good)<br>
;; QUESTION SECTION:<br>
;<a href="http://book.cebupacair.cust.lldns.net" rel="noreferrer" target="_blank">book.cebupacair.cust.lldns.net</a>. IN A<br>
<br>
;; ANSWER SECTION:<br>
<a href="http://book.cebupacair.cust.lldns.net" rel="noreferrer" target="_blank">book.cebupacair.cust.lldns.net</a>. 300 IN CNAME <a href="http://cebupacair-dd.lldns.net" rel="noreferrer" target="_blank">cebupacair-dd.lldns.net</a>.<br>
<a href="http://cebupacair-dd.lldns.net" rel="noreferrer" target="_blank">cebupacair-dd.lldns.net</a>. 60 IN A 68.142.70.27<br>
<a href="http://cebupacair-dd.lldns.net" rel="noreferrer" target="_blank">cebupacair-dd.lldns.net</a>. 60 IN A 68.142.68.27<br>
<br>
Mark<br>
<br>
> On 3 Jul 2019, at 5:48 pm, Wilfred Sarmiento via bind-users <<a href="mailto:bind-users@lists.isc.org" target="_blank">bind-users@lists.isc.org</a>> wrote:<br>
> <br>
> Hi Bind Users,<br>
> <br>
> Currently drained my brain troubleshooting where could be the cause of my issue on one of our Authoritative DNS server.<br>
> 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.<br>
> <br>
> ; <<>> DiG 9.9.4-RedHat-9.9.4-38.el7_3.2 <<>> <a href="http://book.cebupacificair.com" rel="noreferrer" target="_blank">book.cebupacificair.com</a> @<a href="http://dns1.globenet.com.ph" rel="noreferrer" target="_blank">dns1.globenet.com.ph</a><br>
> ;; global options: +cmd<br>
> ;; connection timed out; no servers could be reached<br>
> <br>
> Server logs produce 3 query log then show a query failed (timed out);<br>
> <br>
> client @0x7fd9ac0908d0 x.x.x.x#51579 (<a href="http://book.cebupacificair.com" rel="noreferrer" target="_blank">book.cebupacificair.com</a>): query: <a href="http://book.cebupacificair.com" rel="noreferrer" target="_blank">book.cebupacificair.com</a> IN A +E(0) (203.177.255.10)<br>
> client @0x7fd9a4484080 x.x.x.x#51579 (<a href="http://book.cebupacificair.com" rel="noreferrer" target="_blank">book.cebupacificair.com</a>): query: <a href="http://book.cebupacificair.com" rel="noreferrer" target="_blank">book.cebupacificair.com</a> IN A +E(0) (203.177.255.10)<br>
> client @0x7fd9a4481cb0 x.x.x.x#51579 (<a href="http://book.cebupacificair.com" rel="noreferrer" target="_blank">book.cebupacificair.com</a>): query: <a href="http://book.cebupacificair.com" rel="noreferrer" target="_blank">book.cebupacificair.com</a> IN A +E(0) (203.177.255.10)<br>
> client @0x7fd9ac0908d0 x.x.x.x#51579 (<a href="http://book.cebupacificair.com" rel="noreferrer" target="_blank">book.cebupacificair.com</a>): query failed (timed out) for <a href="http://book.cebupacificair.com/IN/A" rel="noreferrer" target="_blank">book.cebupacificair.com/IN/A</a> at query.c:6786<br>
> <br>
> But when i send a query with +norecurse option, results is successful.<br>
> <br>
> dig +norecurse <a href="http://book.cebupacificair.com" rel="noreferrer" target="_blank">book.cebupacificair.com</a> @<a href="http://dns1.globenet.com.ph" rel="noreferrer" target="_blank">dns1.globenet.com.ph</a><br>
> <br>
> ; <<>> DiG 9.9.4-RedHat-9.9.4-38.el7_3.2 <<>> +norecurse <a href="http://book.cebupacificair.com" rel="noreferrer" target="_blank">book.cebupacificair.com</a> @<a href="http://dns1.globenet.com.ph" rel="noreferrer" target="_blank">dns1.globenet.com.ph</a><br>
> ;; global options: +cmd<br>
> ;; Got answer:<br>
> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 19755<br>
> ;; flags: qr aa ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 5<br>
> <br>
> ;; OPT PSEUDOSECTION:<br>
> ; EDNS: version: 0, flags:; udp: 4096<br>
> ;; QUESTION SECTION:<br>
> ;<a href="http://book.cebupacificair.com" rel="noreferrer" target="_blank">book.cebupacificair.com</a>. IN A<br>
> <br>
> ;; ANSWER SECTION:<br>
> <a href="http://book.cebupacificair.com" rel="noreferrer" target="_blank">book.cebupacificair.com</a>. 1200 IN CNAME <a href="http://book.cebupacair.cust.lldns.net" rel="noreferrer" target="_blank">book.cebupacair.cust.lldns.net</a>.<br>
> <br>
> ;; AUTHORITY SECTION:<br>
> <a href="http://lldns.net" rel="noreferrer" target="_blank">lldns.net</a>. 171335 IN NS <a href="http://ns1.lldns.net" rel="noreferrer" target="_blank">ns1.lldns.net</a>.<br>
> <a href="http://lldns.net" rel="noreferrer" target="_blank">lldns.net</a>. 171335 IN NS <a href="http://ns2.lldns.net" rel="noreferrer" target="_blank">ns2.lldns.net</a>.<br>
> <br>
> ;; ADDITIONAL SECTION:<br>
> <a href="http://ns1.lldns.net" rel="noreferrer" target="_blank">ns1.lldns.net</a>. 149880 IN A 208.111.184.11<br>
> <a href="http://ns2.lldns.net" rel="noreferrer" target="_blank">ns2.lldns.net</a>. 93416 IN A 208.111.184.12<br>
> <a href="http://ns1.lldns.net" rel="noreferrer" target="_blank">ns1.lldns.net</a>. 93416 IN AAAA 2607:f4e8:ac:1::11<br>
> <a href="http://ns2.lldns.net" rel="noreferrer" target="_blank">ns2.lldns.net</a>. 93416 IN AAAA 2607:f4e8:ac:1::12<br>
> <br>
> ;; Query time: 1 msec<br>
> ;; SERVER: 203.177.255.10#53(203.177.255.10)<br>
> ;; WHEN: Wed Jul 03 03:36:21 EDT 2019<br>
> ;; MSG SIZE rcvd: 229<br>
> <br>
> This is the named.conf options;<br>
> <br>
> options {<br>
> directory "/var/namedb";<br>
> version "Query Not Allowed.";<br>
> allow-recursion { globenet; };<br>
> recursive-clients 1000000;<br>
> allow-query-cache { globenet; };<br>
> allow-query { any; };<br>
> tcp-clients 5000;<br>
> <br>
> blackhole { bogusnet; };<br>
> <br>
> pid-file "/var/local/bind/var/run/named.pid";<br>
> zone-statistics yes;<br>
> statistics-file "/var/namedb/named.stats";<br>
> };<br>
> <br>
> Bind version is 9.14.2<br>
> <br>
> The "globenet" group are the list of IPs we allowed for recursion. And this issue happens only on the CNAME record with external domain.<br>
> <br>
> Thank you in advance.<br>
> <br>
> Regards,<br>
> Wil Sarmiento<br>
> <br>
> <br>
> <br>
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<br>
-- <br>
Mark Andrews, ISC<br>
1 Seymour St., Dundas Valley, NSW 2117, Australia<br>
PHONE: +61 2 9871 4742 INTERNET: <a href="mailto:marka@isc.org" target="_blank">marka@isc.org</a><br>
<br>
</blockquote></div></div>
<br>
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