Re: Additional filtering of responses

[Masataka Ohta <[e-mail]>]

Roy Arends wrote:

> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 37612
> ;; flags: qr aa; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 0
> 
> ;; QUESTION SECTION:
> ;010a.example.          IN      A
> 
> ;; ANSWER SECTION:
> 010a.example.           86400   IN      A       192.0.2.9
> 
> ;; AUTHORITY SECTION:
> example.                86400   IN      NS      010a.example.
> 
> ;; Query time: 3 msec
> ;; SERVER: 192.0.2.10#53(192.0.2.10)
> 
> No glue. No additional section. 
> 
> Is the address record in the answer section cached? 
> When cached, is 192.0.2.9 considered authoritative now for future lookups 
> under example?

It seems to me that referral NSes should also be cached tagged by
the query domain, which means 010a.example will be authoritative
for future lookups on 010a.example but nothing else.

						Masataka Ohta


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