NODATA

[Kevin Darcy]

Watanabe, Hiroshi wrote:

>Hi all,
>
>I found the record on my cache server memory like this:
>
>;	3547	IN	A	[master]  [postmaster] (
>;		2005030701 10800 3600 604800 3600 );xxx.co.jp.;NODATA
>;-$	;Cr=3Dauth [xxx.xxx.xxx.xxx]
>
>There is "NODATA" key word.
>I want to know how can I get the simular record including NODATA on my
>test machine.
>In other words, I want to know the conditions for making NODATA record.
>
Pick a name. Query for that name, with a record type that you know the 
name doesn't own. For instance, if you know you have no HINFO records 
for a particular name that "exists" (i.e. it owns records of some 
*other* type(s)), query the name with record type HINFO. You should get 
a response with RCODE=NOERROR, 0 answers and no referral records in the 
Authority Section, i.e. what is commonly known as a NODATA response. 
Modern versions of BIND will know to cache such "negative" responses. 
See RFC 2308 for more details.

- Kevin