<html><head><title>Re: BIND server; dig vs dig +trace on failing lookup.</title>
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<span style=" font-family:'Courier New'; font-size: 9pt;">Would you mind showing me how you got there?<br>
[The answer is fab, obviously. But give a man a fish...and all that. :) ]<br>
<br>
-Greg<br>
<br>
<br>
<br>
<span style=" color: #800000;"><b>MA> The COM servers have stale glue<br>
<br>
MA> srvns.pacifier.com. 172800 IN A 216.65.128.5<br>
MA> webns.pacifier.com. 172800 IN A 216.65.128.1<br>
<br>
MA> vs<br>
<br>
MA> srvns.pacifier.com. 86400 IN A 64.255.237.241<br>
MA> webns.pacifier.com. 86400 IN A 64.255.237.240<br>
<br>
MA> The later set of servers are what you query when you run dig +trace.<br>
MA> If you prime the cache the plain lookup should work. Report the out<br>
MA> of date glue to the zone administrator.<br>
<br>
MA> Mark<br>
<br>
>> On 3 Mar 2021, at 13:06, Gregory Sloop <</b></span></span><a style=" font-family:'courier new'; font-size: 9pt;" href="mailto:gregs@sloop.net">gregs@sloop.net</a><span style=" font-family:'courier new'; font-size: 9pt; color: #800000;"><b>> wrote:<br>
<br>
>> I've got a case, (and I see several other similar reports) where BIND is failing to find an A record for a domain.<br>
>> Yet a dig +trace does.<br>
<br>
>> (I'm doing the dig on the BIND server. It's set to be a root resolving server, not a forwarder.)<br>
<br>
>> As I understand this, +trace will also involve resolve.conf options. And in this case, I've got Google DNS as one of the resolve.conf entries.<br>
>> So, I can see how +trace would deliver different results than simply dig-ing - provided that +trace does involve resolve.conf.<br>
<br>
>> Here's a plain dig, using the BIND server itself - from the console.<br>
>> ---<br>
>> dig cistus.com @10.8.20.5<br>
<br>
>> ; <<>> DiG 9.11.3-1ubuntu1.14-Ubuntu <<>> cistus.com @10.8.20.5<br>
>> ;; global options: +cmd<br>
>> ;; Got answer:<br>
>> ;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 61786<br>
>> ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1<br>
<br>
>> ;; OPT PSEUDOSECTION:<br>
>> ; EDNS: version: 0, flags:; udp: 4096<br>
>> ; COOKIE: 13ec0c9b10770ea12426539e603957900a997f7258962cce (good)<br>
>> ;; QUESTION SECTION:<br>
>> ;cistus.com. IN A<br>
<br>
>> ;; Query time: 0 msec<br>
>> ;; SERVER: 10.8.20.5#53(10.8.20.5)<br>
>> ;; WHEN: Fri Feb 26 12:18:24 PST 2021<br>
>> ;; MSG SIZE rcvd: 67<br>
<br>
>> ---<br>
<br>
>> I could post the dig +trace, if it adds any information, but I suspect it doesn't.<br>
<br>
>> So, what methods or steps might I take to figure out why the above lookup/dig fails?<br>
>> [I intended +trace to do that, but since it's not doing the same thing a plain dig does, it's not very useful as a diagnostic tool.]<br>
<br>
>> I've done some searching to see how to accomplish this, but it's a difficult question to frame without a ton of worthless hits.<br>
>> So, can someone point me at a good source for a how-to/walk-through? A previous list posting?<br>
<br>
>> Again, the question is; what methods or steps (best practices) might I take to figure out why the above lookup/dig fails?<br>
<br>
>> TIA<br>
>> -Greg<br>
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