reverse-zone and subnet

[Peter Pilsl]

On Fri, Jan 18, 2002 at 07:23:32PM +0000, Barry Margolin wrote:
> In article <a29ljr$jkj at pub3.rc.vix.com>,
> Peter Pilsl  <pilsl at goldfisch.at> wrote:
> ># dig @localhost -x 213.229.42.97 +norecursion
> 
> You need recursion, or your server won't go to the ISP's servers to look up
> the CNAME records that link into this subdomain.
>

thnx a lot for your help, but my quest isnt over yet.

Im not sure if I understand your answer

For now I just want to check if my zone for the reverse lookup
works (and then ask my ISP to delegate ...).
 If I ask my nameserver for a zone that is owned by this
nameserver it should not do deeper recursion. The answer should be
given in the first step.
 Why is this different for reverse lookup ? If I understood you right,
a reverselookup in my case would involve four steps:
 i) ask local nameserver that hints to root-server
 ii) root-servers hints to my ISP
 iii) my ISP hints to my local nameserver again (if the delegation for
my subnet would be installed there)
 iv) my local nameserver reveals the reverse lookup

Why does my local nameserver doesnt give the answer in the first step
? This is what it does for non-reverse zones and for non-routable
reverse-zones (ie. 0.10.168.192.in-addr-arpa.)

# dig @localhost -x 192.168.0.1 +norecursive
 
; <<>> DiG 9.2.0rc3 <<>> @localhost -x 192.168.0.1 +norecursive
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 7085
;; flags: qr aa ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 2
 
;; QUESTION SECTION:
;1.0.168.192.in-addr.arpa.      IN      PTR
 
;; ANSWER SECTION:
1.0.168.192.in-addr.arpa. 259200 IN     PTR     server.local.
 
;; AUTHORITY SECTION:
0.168.192.in-addr.arpa. 259200  IN      NS      ns2.local.
0.168.192.in-addr.arpa. 259200  IN      NS      ns1.local.
 
;; ADDITIONAL SECTION:
ns1.local.              259200  IN      A       192.168.0.1
ns2.local.              259200  IN      A       192.168.0.1
 
;; Query time: 1 msec
;; SERVER: 127.0.0.1#53(localhost)
;; WHEN: Sat Jan 19 00:23:05 2002
;; MSG SIZE  rcvd: 136


thnx,
peter

-- 
peter pilsl

phone: +43 699 13574035
fax  : +43 699 43574035 
email: pilsl at goldfisch.at

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