Well, RFC 1918 *itself* says you shouldn't do this:
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.
(In Section 5, Operational Considerations).
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.
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. http://www.merit.edu/mail.archives/nanog/2006-09/msg00359.html
- Kevin
On 8/9/2010 8:09 PM, donovan jeffrey j wrote:
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;
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.
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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