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Well, RFC 1918 *itself* says you shouldn't do this:<br>
<br>
<blockquote>If an enterprise uses the private address space, or a mix
of private and public address spaces, then DNS clients outside of the
enterprise should not see addresses in the private address space used
by the enterprise, since these addresses would be ambiguous.<br>
</blockquote>
(In Section 5, Operational Considerations).<br>
<br>
But, you should understand that RFC 1918 itself is only a "BCP" (Best
Current Practice), not a Standards-Track document, so you can't really
call the RFC Police on them.<br>
<br>
On the other hand, common sense would dictate that if you use RFC 1918
at all, you shouldn't pick and choose which parts of it you follow and
which parts you don't. The arguments go both ways on this point, see
e.g. <a class="moz-txt-link-freetext" href="http://www.merit.edu/mail.archives/nanog/2006-09/msg00359.html">http://www.merit.edu/mail.archives/nanog/2006-09/msg00359.html</a><br>
<br>
- Kevin<br>
<br>
On 8/9/2010 8:09 PM, donovan jeffrey j wrote:
<blockquote
cite="mid:FB71B178-4492-4559-A3CE-BEB25755593B@beth.k12.pa.us"
type="cite">
<pre wrap="">Greetings
my isp has some private address space which has dns resolution and can be queried from the outside world.
I asked them about this because we use this private address space and it is showing up in our DNS lookups. here was there response;
</pre>
<blockquote type="cite">
<pre wrap=""> I've discussed this with our systems administrators and have been told that this is performing as expected. ISP DNS servers do contain information about private adresses that are in use on our network. If you are utilizing our DNS servers, you will see resolution of private IPs to ISP hostnames when appropriate. That will not occur using external DNS servers. You will see resolution of PTD hostnames to private IPs from external servers, but not IP resolution to hostnames. As long as reverse DNS (IP to hostname) is not propogating, things are functioning normally.
</pre>
</blockquote>
<pre wrap="">
so even from google public dns i see lookups that refer back to a private address space on my ISP's net.
is that right ?
-j
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</pre>
</blockquote>
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