Delegation Q... again

[Will Yardley]

Harison Phinizy wrote:
> Sorry for yet anoter Q...
> 
> If I am delegating a part of a class C 11.22.33.10 -11.22.33.20
> 
> will my cname be:
> 
> 11.22.33.44.in-addr.arpa. cname 11.10/20.22.33.10.in-addr.arpa.
> 
> And so on to 20?  Or is 14/28 a dns thing.  The reason I ask is I
> delegated an ip block that was .14 - .28 and I am not sure if that is
> standard or dependent on the sitation.

There is no actual standard for this since it's not an official zone.
Are you delegating the netblock or are you _being_ delegated part of a
netblock?  If it's the latter, you don't really have much choice as to
HOW your ISP delegates it (ie what name they choose to call the zone),
and it's not really relevant.  Just make sure you get the right info
from your isp and then generate for the zone they say you should be
generating for.

For instance, pac bell does it like so:

aura% dig -x 64.174.220.42

; <<>> DiG 9.2.0rc1 <<>> -x 64.174.220.42
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 2091
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 5, ADDITIONAL: 2

;; QUESTION SECTION:
;42.220.174.64.in-addr.arpa.    IN      PTR

;; ANSWER SECTION:
42.220.174.64.in-addr.arpa. 7200 IN     CNAME
42.40.220.174.64.in-addr.arpa.
42.40.220.174.64.in-addr.arpa. 7200 IN  PTR     aura.infinitejazz.net.

ie they create the zone 40.220.174.64.in-addr.arpa. and I make records
for 4x.40.220.174.64.in-addr.arpa.  so it really varies from ISP to ISP.

If you are the one doing the delgation (it doesn't look like you are),
you'd want to follow one of the reccomendations in rfc2317, but again
it's up to you.

w

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