Unexplained broken name service
Michael Bryan
bind at ursine.com
Wed Jul 5 16:49:32 UTC 2000
Phil White wrote:
>
> Lord knows what, but I have done someting to severely break my
> nameserver. I am now so perplexed, I'll post details here in case
> anyone can offer some pointers as to why (apart from me being a
> plonker! ;-)
>
> ITMagic host a few virtual domain web-sites. All has been working fine
> for many months - until I had a tinker at the week-end. I'll split the
> changes into sections.
>
> 1) changed the machine name of my Linux box from gemini to radagast.
> 2) add in CNAME records for our name servers (dns0 & dns1)
> and kept gemini as an alias.
> 3) ammend the registered DNS info for the domain jazzjive.co.uk
> to point to dns0 & dns1, rather than gemini & merlin
You cannot have NS records pointing to CNAME aliases. The hostname in
the data portion of an NS record -must- have an A record associated with
it.
So rather than this:
$ORIGIN itmagic.ltd.uk.
dns0 CNAME radagast.itmagic.ltd.uk.
dns1 CNAME merlin.itmagic.ltd.uk.
radagast A 194.203.96.253
merlin A 194.203.96.252
Try this instead:
$ORIGIN itmagic.ltd.uk.
dns0 A 194.203.96.253
dns1 A 194.203.96.252
radagast A 194.203.96.253
merlin A 194.203.96.252
>
> That was on Sunday. Now (wednesday), although I can ping all the
> machines within itmagic.ltd.uk, including all aliases, I am unable to
> connect to any of our virtual machines eg. www.jazzjive.co.uk.
> Now, as this used to work, I know it isn't the web-server at fault.
> Also, when I do an nslookup using one of our machines as a server, all
> is OK. However, using an external nameserver results in
> *** ns0.bt.net can't find jazzjive.co.uk.: Server failed.
>
> The only other symptom I can find is this entry in /var/log/messages
> Jul 5 15:09:23 radagast named[1338]: sysquery: findns error
> (NXDOMAIN) on gemini.itmagic.ltd.uk?
>
> Any ideas?
>
> --
> System details.
>
> dns0.itmagic.ltd.uk CNAME radagast.itmagic.ltd.uk
> Slackware / Bind v8 (primary DNS)
> dns1.itmagic.ltd.uk CNAME merlin.itmagic.ltg.uk
> Windows NT / Secondary DNS / Web server
> www.jazzjive.co.uk CNAME merlin.itmagic.ltd.uk
> Our virtual service.
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