Nameserver records outside current domain

[James Raftery]

On Thu, Jun 28, 2001 at 07:54:12PM +0200, Len Conrad wrote:
> When a DNS queries the .com parent for bar.com, the .com parent returns a 
> "referral" that looks like this:
> 
> ;delegation data
> bar.com. Ns ns1.foo.com.
> bar.com. NS ns2.foo.com.
> 
> ;glue records
> ns1.foo.com a ip.ad.re.ss
> ns2.foo.com a ip.ad.re.s2
> 
> The querier doesn´t have to resolve the ns ip´s, they are in the 
> "additional section" of the referral.

If, and only if, the parent knows the IP addresses. Consider:

; <<>> DiG 8.2 <<>> @a.gtld-servers.net iedr.com ns +norecurs 
; (1 server found)
;; res options: init defnam dnsrch
;; got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 12511
;; flags: qr; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 0
;; QUERY SECTION:
;;	iedr.com, type = NS, class = IN

;; ANSWER SECTION:
iedr.com.		2D IN NS	NS0.DOMAINREGISTRY.IE.
iedr.com.		2D IN NS	ICE.VIA-NET-WORKS.IE.
iedr.com.		2D IN NS	NS2.UCD.IE.

;; Total query time: 97 msec
;; FROM: drno.domainregistry.ie to SERVER: a.gtld-servers.net  192.5.6.30
;; WHEN: Fri Jun 29 09:30:01 2001
;; MSG SIZE  sent: 26  rcvd: 115


No Additional Section! In this case, a nameserver will have to put
the original query on-hold and resolve for one of the nameservers
in the response.


Regards,
james