Date: Mon, 8 Nov 2010 10:18:09 +0200 From: Jonathan McKeown <j.mckeown@ru.ac.za> To: freebsd-questions@freebsd.org Subject: Re: Glue records (was Re: ATTN GARY KLINE) Message-ID: <201011081018.09682.j.mckeown@ru.ac.za> In-Reply-To: <201011052051.oA5Kp145022389@mail.r-bonomi.com> References: <201011052051.oA5Kp145022389@mail.r-bonomi.com>
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On Friday 05 November 2010 22:51:01 Robert Bonomi wrote: > > From owner-freebsd-questions@freebsd.org Fri Nov 5 02:26:31 2010 > > From: Jonathan McKeown <j.mckeown@ru.ac.za> > > To: freebsd-questions@freebsd.org > > Date: Fri, 5 Nov 2010 10:27:38 +0200 > > Subject: Glue records (was Re: ATTN GARY KLINE) > > > > When a nameserver delegates a zone, it's not responsible for any of that > > zone's records any more, with two exceptions. It provides NS records to > > indicate which nameservers /are/ responsible, and it retains > > responsibility for the A records of nameservers inside the zone - and > > only those nameservers. (That's glue.) > > > > There's no way a .com nameserver should be providing A records for hosts > > in the .au zone. > > sure there is. > > Domain: foo.com (an aussie company) > nameservers ns1.alicesprings.au, ns2.umelbourneatperth.au I think we're agreeing violently ;) The nameservers for the .com zone, when asked about foo.com, should reply with the hostnames of the two nameservers. It shouldn't reply with their IP addresses; the only nameservers that can do that are the ones serving the .au zone or the alicesprings.au and umelbourneatperth.au zones. > They're still wrong to bw whinging about a lack o glue records. > glue is needed _only_ when the nameserver is _in_ the domain it is the > authoritative servr for. > > So, in the above frivolous example, foo.com does *NOT* need any glue > records, but if ns1.alicesprings.au is an authoritative server for > alicesprings.au, then *it* needs a glue record for that domain. Well, the glue record will be ``above the cut'': if .au delegates alicesprings.au, it's the .au nameserver that provides the A record for ns1.alicesprings.au; but, yes.
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