Truncated, retrying in TCP on Reverse lookup

Thu Jul 16 01:51:44 UTC 2009

In message <4A5E300C.7050709 at gmail.com>, Dave Sparro writes:
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> Matus UHLAR - fantomas wrote:
> <blockquote cite="mid:20090713142135.GA28719 at 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:freaknetboy at yahoo.com">&
> lt;freaknetboy at 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
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PHONE: +61 2 9871 4742                 INTERNET: marka at isc.org