nanog mailing list archives

RE: www.worldnet.att.net Network not in table


From: "Michael Hallgren" <m.hallgren () free fr>
Date: Sun, 13 Apr 2003 18:38:50 +0200




On Sun, Apr 13, 2003 at 03:32:39PM +0200, Michael Hallgren wrote:

So far as I know, www.worldnet.att.net is intended to be
reachable only
from Worldnet dialups.  204.127.0.0/17 is not advertised to
the Internet
at large.  www.att.net is in 204.127.128.0/17 and is reachable from
anywhere.

If so is (which appears to be the case), for what reason is the
(global) DNS populated with corresponding data? Somewhat harmless,
but fairly easy to clean up (via, for example, DNS configuration
views) -- for making things more beautiful.

I've never been a fan of split DNS views, because it makes assumptions
about what DNS servers people are using.

OK. Right.

 What if a worldnet customer,
say, wants to run a recursive named on his own machine, and handle his
own lookups?  Then he is, necessarily, going to get the "global" view
all the time, even when he's dialed in to Worldnet.  So it makes sense
for "only reachable from worldnet" stuff to be globally viewable.


OK. But I'd guess most people (like myself, from time to time) would rather
run a local one forwarding requests to a suitably close (my upstream's) one?
(Depends on who you are and how you connect, of course.)

And what if you're connected to multiple "private" networks, each with
their own DNS, at once?  Then you've got to pick which private names
you want to see, and point at the appropriate DNS ...



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