(usagi-users 03508) RCODE =3 (Name Error) + DNS

Hi 
As per RFC 4074 the server should return Name Error (i,e, RCODE = 3)
for a target , about which it does not maintain any information.

that i have tested like, i have my own domain "ipv6.domain."
No within this i have one of my host as "myhost.ipv6.domain."
but while querying i do it like this

dig host.ipv6.domain.  AAAA

getting the response with RCODE = 3. 
where i got the doubt is like, if we make mistake in the domain name 
itself
like, instead of ipv6.domain say i typed ip.domain. In this case also 
should i get 
the response with RCODE = 3, if my server is the authritative for this 
zone 
(i configured it as root server for my domain).
In this case i donot get the response with RCODE = 3.

One thing more, in BIND9, this RCODE = 3 they have represented as NXDOMAIN
not as Name Error. I donno what this NXDOMAIN really means, whereas it got 
the
same RCODE (3) value like Name Error (As per RFC 4074) 

please comment...

thanks & regards
Sanjib



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