Classless IN-ADDR.ARPA delegation

[Barry Margolin]

In article <37AE3305.E1347446 at cisco.com>,
Michael Voight  <mvoight at cisco.com> wrote:
>Barry Margolin wrote:
>> 
>> In article <99080808491004.11196 at dns.eklanda.net>,
>> Magnus Benngard  <magnus at eklanda.net> wrote:
>> >From name to IP no problem.
>> >From IP to name - not working.
>> >Should it work even if my ISP has not fix the Classless IN-ADDR.ARPA
>delegation?
>> >(I am 100 percent sure my ISP has not delegated anything.)
>> 
>> No, it won't work if they haven't delegated.  It's not like normal reverse
>> DNS, where you'll get reverse resolution if you use your own server, but
>> not get it if you use an outside server.  The technique in RFC 2317 only
>> works if the domain for the /24 block contains CNAME records that point
>> into your subdomain.
>> 
>
>Then, optionally, can't he just pretend he owns the whole subnet and
>serve that??? Of course, ptr records he doesn't have for the subnet will
>not be resolved.

Yes.  But if his intent is to test whether his classless in-addr setup
works, it won't be a valid test.

-- 
Barry Margolin, barmar at bbnplanet.com
GTE Internetworking, Powered by BBN, Burlington, MA
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