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Author Topic: Error reported by BIND in DNS config  (Read 233 times)

Weaver

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Error reported by BIND in DNS config
« on: June 26, 2020, 10:51:20 AM »

I got an email from my ISP Andrews and Arnold telling me that because I had messed up some of the DNS config for one of my domains, BIND had reported an error and would not load. The problem is to do with the rules for coexistence of CNAME records with other records. I read RFC1912 section 2.4 but Iím too stupid to understand it. Could anyone help me at a level suitable for an utter wally such as myself?

I donít know what the rules related to CNAMEs are here. I wish I could write some tool to check the AA DNS config myself. I donít see a way of downloading all of the DNS config from clueless but perhaps good old copy-paste would get me there, and then it would just be a matter of dull grunt work if I only knew what the required check rules are.

Itís a shame that AAís clueless.aa.net.uk web server UI doesnít do the required CNAME-related legality checks for me.
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d2d4j

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Re: Error reported by BIND in DNS config
« Reply #1 on: June 26, 2020, 11:32:46 AM »

Hi

@weaver - you need give more details if you want help

I would think aa would have provided the failed cname so should be easy to spot/correct

Our ns/dns would not allow dns errors so it would not load

Many thanks

John
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Weaver

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Re: Error reported by BIND in DNS config
« Reply #2 on: June 26, 2020, 11:58:14 AM »

AA did point me to the CNAMEs that are giving the problem, I emailed back asking for clarification. i canít give you details yet as I donít understand enough about the issue.

My question is just as much about that RFC, which I simply donít understand.

From what I can see, itís some rule about existence of other records being disallowed where either the lhs or rhs of a CNAME (which?) breaks some rule relating to some other recordís content or existence. The RFC provides an example but Iím too stupid to understand it, and also I donít know why it should be a problem whatever it is.

I didnít know about this problem, never experienced it before somehow. I admit that I have been overusing CNAMEs for ease of maintainability so i would ideally only have to change things in one place, not change a whole load of duplicated references to things.



I didnít get any improvement in my understanding as the reply came back from AA saying that I had fixed the errors, which I presume I must have managed to do because of a partial cull on CNAMEs but it could be some other change i have made very recently, but anyway I now have no idea what I did to fix the issue.

Iím told that a new yet-to-be-released version of the clueless.aa.net.uk AA control server will do the required checking.
« Last Edit: June 26, 2020, 12:18:10 PM by Weaver »
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Chrysalis

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Re: Error reported by BIND in DNS config
« Reply #3 on: June 27, 2020, 05:46:07 AM »

until can see the records in question, its hard to provide help, its likely a syntax error.
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Weaver

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Re: Error reported by BIND in DNS config
« Reply #4 on: June 27, 2020, 11:45:37 PM »

hi chrys - this is entered through AAíS web ui management control panel, so not directly interacting with BIND.

Iím trying to understand that RFC example here and failing.
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