conflicting subdomain delegation

[Frank Liu]

bind9 resolver a simple cache only with root hint. no local zones.

On Tue, Nov 13, 2018 at 9:18 AM Lyle Giese <lyle at lcrcomputer.net> wrote:

> On 11/13/2018 11:04 AM, Frank Liu 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:
>
> b.a.com NS host1
> c.b.a.com NS host2
>
> On host1 in zone b.a.com, there is
> c.b.a.com NS host3
>
> 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).
>
> Any ideas?
> Thanks!
>
>
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> I would expect that behavior if the Bind9 resolver was setup to query
> host1.  If bind9 queries a server that is authoritive for b.a.com, I
> would expect that result.  If the bind9 resolver is setup to query a
> recursive only server(other than host1), I would expect the same behavior
> as the +trace result.
>
> so I think the answer is dependant on how your bind9 resolver is
> configured.
>
> Lyle Giese
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