Re: [DNSOP] Services and top-level DNS names

> On Sat, Jul 05, 2008 at 01:11:36AM -0400, Brian Dickson wrote:
> > That's precisely why it makes sense to think about the partial name 
> > problem, before big problems happen for lots of ISPs.
> 
> My feeling is that search lists for DNS are a bad optimization that
> should never have happened.  After publication of RFC 1535, they
> should have been removed altogether, instead of being half-patched.
>     ftp://ftp.rfc-editor.org/in-notes/rfc1535.txt
> 
> I routinely dot-terminate domain names and disable search lists,
> and I believe software should treat any given domain name as it is
> presented, without trying to second-guess the intent.  Software should
> not try to guess intent when the syntax is unambiguous.

	no dots == local (search)
	dots == global unique

	It's only when you start treating one as the other that you
	get into problems.  This can be enforced in the getaddrinfo()
	and friends by not looking up single label tokens against
	".".  "localhost" is solvable before anyone complains about it.

> It is way too late to catch this particular horse, but removing bad
> optimizations from current software releases would still be a useful
> step to take.  It would certainly be better than continuing to keep
> them around due to some notion that inertia is invincible.

	To get rid of searching you also need to get rid of alternate
	name spaces (NIS, /etc/hosts).

	We really need to provide / encourage mechanisms for home
	networks to get domains for $0 additional cost.  With IPv6
	we will be connecting networks, not machines.  ISP's need
	to come up with schemes which can be used to plug home
	networks into the global DNS.  ISP's are going to have to
	support reverse IPv6 zones (delegate/serve).  It's only a
	small additional step to support the forward zones in
	addition to reverse zone.

	e.g.
		<identifer>.<isp>.net -> <machine>.<identifer>.<isp>.net
	or
		<identifer>.home.<isp>.net ->
			 <machine>.<identifer>.home.<isp>.net

	Where <identifer>.<isp>.net or <identifer>.home.<isp>.net
	is a dynamic zone.  <identifer> may or may not be the account
	identifier.

	Mark

> -- Andras Salamon                   andras@dns.net
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-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark_Andrews@isc.org
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