In message <4a5e300c.7050...@gmail.com>, Dave Sparro writes:
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> Matus UHLAR - fantomas wrote:
> <blockquote cite="mid:20090713142135.ga28...@fantomas.sk" type="cite">
> <blockquote type="cite">
> <pre wrap="">On Thu, Jul 09, 2009 at 05:50:02AM -0700,
> Fr34k <a class="moz-txt-link-rfc2396E" href="mailto:freaknet...@yahoo.com";>&
> lt;freaknet...@yahoo.com></a> wrote
> a message of 119 lines which said:
>
> </pre>
> <blockquote type="cite">
> <pre wrap="">There should be one and only one PTR for that IP.
> </pre>
> </blockquote>
> </blockquote>
> <pre wrap=""><!---->
> On 10.07.09 22:40, Stephane Bortzmeyer wrote:
> </pre>
> <blockquote type="cite">
> <pre wrap="">No. No good reason for such restriction.
> </pre>
> </blockquote>
> <pre wrap=""><!---->
> While from DNS' point of view there is no reason to do that, many programs
> checking and/or validating reverse DNS may comply or give strange results
> (different hostname may appear in the logs).
>
> Also, validating (forward confirming) more reverse names takes much longer
> time than validating just one. Or, will you validate only one/few of them?
> </pre>
> </blockquote>
> <br>
> How do you validate when the forward host name that you know about
> doesn't match the single PTR record you think reverse DNS should be
> limited to?<br>
> <br>
A machine has a cannonical name. Everything else is a alias
whether it is a CNAME or A or AAAA.
Mark
> -- <br>
> Dave<br>
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Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: ma...@isc.org
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