puzzled by NS records from referrers

[Barry Margolin]

In article <87ngvv$9qu$1 at nnrp1.deja.com>,  <Marc_Lampo at hotmail.com> wrote:
>In this given situation ns.domain.tld. learns NS-RR's from two sources :
>1. the zone file of tld. (holding 2 NS's)
>2. data from the master obtained via zone transfert (holding 3 NS's)
>
>I actually expected this name server to return the 3 NS's when asked
>for, but it turns out it sticks to the 2 in the tld. zone file.
>So it looks like it ignores (at least the NS's) that come in from the
>master.  But I fail to see why ?

My experience has been just the opposite.

>Also noteworthy is that slave servers of the tld. domain (that are not
>slave for customer.tld.) do return various answers : some return 2 NS's,
>others return 3 NS's. (which seems unrelated to the version of the
>server or the "recursion available" being set or not).

It sounds to me like some of them (including the tld server) are not
actually getting successful transfers of the subdomain, so all they know
are the NS records in the tld.

When you get 2 NS's, does it have the "authoritative answer" flag set?

-- 
Barry Margolin, barmar at bbnplanet.com
GTE Internetworking, Powered by BBN, Burlington, MA
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