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 <http://a.com>, there are two NS delegations:
b.a.com <http://b.a.com> NS host1
c.b.a.com <http://c.b.a.com> NS host2
On host1 in zone b.a.com <http://b.a.com>, there is
c.b.a.com <http://c.b.a.com> NS host3
As you can see, there is a conflicting delegation for c.b.a.com
<http://c.b.a.com>. If I look a name d.c.b.a.com <http://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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