conflicting subdomain delegation
Mark Andrews
marka at isc.org
Tue Nov 13 21:50:18 UTC 2018
> On 14 Nov 2018, at 4:04 am, Frank Liu <gfrankliu at gmail.com> wrote:
>
> Hi,
>
> Is there a RFC determining which nameserver to use if there is a conflicting subdomain delegation?
>
> eg:
> In the zone of a.com, there are two NS delegations
This one is used.
> b.a.com NS host1
This one is ignored as it is occluded data.
> c.b.a.com NS host2
>
> On host1 in zone b.a.com, there is
> c.b.a.com NS host3
Which is occluded data or glue depending upon the rest of the contents of the zone.
> As you can see, there is a conflicting delegation for c.b.a.com. If I look a name d.c.b.a.com, will the nameserver host2 or host3 be used?
> dig +trace seems to go to host2, but bind9 as a resolver goes to host3.
> (the test was done on a centos7).
dig +trace follows the returned delegations.
> Any ideas?
> Thanks!
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Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: marka at isc.org
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